fuel injector wiring harness problem

The electrical connection to the fuel injector may be hampered by shorts in the wiring, inadequate voltage at the injector plug, or incorrect resistance in the fuel injector. If the fuel injector is clogged, the fuel supply will be irregular too. Skip to main content.us. There is a tab that keeps the terminal in place when you push it on a male connector. The Bosch connectors only come in black so you'll loose your color coding unless you repaint the connectors to match. I don't know how common that problem is, but given the frequency of the injector harness issue, I'm betting dollars to doughnuts, that you might find the same problem that I did. The other should read around 12 volts. This replacement fuel injector harness matches the fit and function of the original equipment part to restore proper operation of the injection system. Replace the wiring for any single wire set which fails the 12-volt test. Connect the multimeter's red lead to one of the disconnected plugs. Replace the injector associated with the plug which, when connected, resulted in the multimeter test failure. 06/17/07 - Added link for Kyle's harness repair business As far as tools, not much really. Turn over the engine and recheck the voltage on multimeter. All of the parts are readily available except the large ECU connector: I'm still looking for that but given that it's pretty durable and the terminals inside are available, a donor harness will more than do for a rebuild. The terminals in the connectors oxidize as does the exposed wire and some of the wire covered by insulation, The double relay and ground terminals corrode as well, There is always a risk of breaking the original connectors and tearing boots. Note the value or write it down. 07/15/19 - Google update: new adsense code, removed defunt translate button This is what a new harness would have looked like: Recently, I was contacted by rebuilder who has taken on harness rebuilds and does a fabulous job. Skip Shelton has been writing since 2001, having authored and co-authored numerous articles for "Disclose Journal." There is another wire harness behind the glove box that caused our blower motor to randomly come on and off. All you need beside that is some white wire and some similar looking gray heat-shrink. Turn the ignition key to the "On" position. General Motors details a chafing problem in the FICM wiring harness (TSB #09-06-04-034) as it passes behind the alternator mounted on the front passenger side of the engine. Insert the black and red multimeter leads on the sides of the fuel injector and read the multimeter. There are 5 distinct versions of the fuel injection wiring harness used on 74-79 busses with Bosch L-Jet Fuel Injection: Chances are very high that you'll never see a 1974 CA Automatic harness because it's so rare. Yes, the PCM , injector and wiring is all there is. GM > L, L, L > Using a Wiring Diagram, I knew that I needed to locate pin #31 in the C2 (Red) connector of the PCM. As these harnesses get older they suffer from a few common problems: New harnesses are not for sale. Sometimes the tension of the wires in the harness and the engine vibration force the connectors off the FI components. Remove them carefully and don't drop them. See Kyle Lacey's website: 05/05/04 - Created They should all be around 12 volts. The strong ones are often harmful to plastics which mean you'd have to remove every terminal from it's connector to apply the solvent or sacrifice a spare connector to test to potency of the cleaner. Melted injector wire harnesses are effecting early 4th generation 2001 thru 2004 vans. The wiring harness will have two terminals that the prongs on the injector insert into. This is a "Factory Replacement Custom Fuel Injector Harness" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. Replace the injector if the Ohm value is significantly different than other injectors. If it is intermittent then with the engine running wiggle the harness and see if anything happens. Replacing the injector harness is not all that difficult. Sometimes the tension of the wires in the harness and the engine vibration force the connectors off the FI components. This is a basic TBI harness for all engines using ECM 1227747 and 1228746 type ECM-many others can be used. Because you are testing the current it is not necessary to have a specific lead on a specific side of the plug. Failed injectors may still fire, leading you to believe the problem is in the wiring. If you don't see the wiring harness you need listed below, please call us - we have harnesses for almost all Chevy V8 and V6 gas engines, and for all LS-x based combinations from 1998 - … It's a back-burner project for me at present. To test to see if injector #6's Ground circuit (wire) is shorted to Ground inside the engine's Wiring Harness, the wiring between the PCM and the ‘Spider’ assembly needed to be isolated. A lower reading means there is excess resistance in the wire somewhere. Keep the multimeter attached to the plug. Place the multimeter leads into the fuel injector plug terminal. It is not necessary to have the black or red leads on a specific side of the plug terminal. 00:00. The thing to be careful of is the clips on top of the injectors. The voltage should read approximately 12 volts. One will be connected to ground and will read 0 volts. Disconnect the electronics plug wire from the fuel injector. A failed injector will have too little or too much resistance and the Ohm value will be widely different than the other readings. Over time, the fuel injection wiring harness can be damaged and needs to be replaced. We offer LS / LT swap harnesses for all Gen 3, 4 and 5 LS / LT engines including LS1, LS2, LS3, LS6, LS7, LSA, LS9, Gen 5 V8, LT1, LT4 ,LQ4, LQ6, L99, Vortec variants - DOD, VVT, AFM. Read the Ohms, or resistance, produced by the fuel injector. A failed injector will have too little or too much resistance and the Ohm value will be widely different than the other readings. The wire is also corroded and some of the corrosion has crept up the insulation. ConPus FICM Engine Fuel Injector Complete Wire & Pigtail Wiring Harness Fits 6.0L Diesel 2004-2005 Excursion / 2003-2007 F250, F350, F450, F550 (Replaces 5C3Z-9D930-A, … The opened valve allows pressurized fuel to be pushed through the fuel injector nozzle into a fine spray. The rest of the injectors are fine. :-). An investigation revealed that mice had gotten into my garage, made themselves at home under the lower intake manifold, and chewed the wires going to the cylinder 1 fuel injector to pieces. Get the best deals on Wiring Harnesses Fuel Injectors when you shop the largest online selection at eBay.com. Be sure to test all the wires before replacing any single set. Swapped #2 and #7 injector harnesses, same thing. It's actually a very good terminal design but difficult to work with because the parts are so small. Replace the injector if the Ohm value is significantly different than other injectors. As these harnesses get older they suffer from a few common problems: The plastic connectors become brittle and break. The engine draws in oxygen by way of the air intake and fuel from fuel injection. Steps to determine the source of the problem? Unplug one of the wiring-harness connectors attached to the fuel injectors. Either way this is less than ideal compared to rebuilding the harness. Try Prime. $45.00. There seems to be a problem serving the request at this time. Labor would be about 1 day if you have the proper crimper and template laid out on a board as a guide. Insert the black and red multimeter leads onto each side of the fuel injector electronics plug. If you notice your vehicle is idling roughly or misfiring or your engine isn't performing normally, be sure to check your fuel injection system, including your fuel injection wiring harness. Black Smoke From Exhaust Problems. You are here. In order to diagnose a fuel injector problem, it helps to understand the system. Compare the value of each reading to the other values. Test all the fuel injector Ohm readings. Recently got cylinder 1 misfire / ignition failure codes. This harness is designed to be a complete wiring system for the fuel injection system on General Motors tuned port (5.0L and 5.7L) injection engines. Account & Lists Account Returns & Orders. For some reason fuel is not getting into the engine. eBay; eBay Motors; Parts & Accessories; ... Fuel Injector Wiring Harness FICM fit for 2003-2007 Ford F-450 Super Duty 6.0L . Continue attaching more plugs and retesting until all plugs are attached or until the multimeter fails to display a 12 volt to 0 volt alternation. The closest you'll find is 1.0 mm2 wire (AWG 18) but it doesn't hurt to oversize by a little. The plastic connectors become brittle and break. Set a multimeter to "volts." Turn the multimeter to "volts." He holds a Bachelor in Science in education and a Master of Business Administration with an emphasis in management from Northwest Nazarene University. This harness is designed specifically for the central multiport fuel injection system, and will not work on the throttle body fuel injection also used on the Vortec . All Hello, Sign in. I think it has something to do with the wiring connection to the fuel injector because when the wires are in the plastic connector it won't start, but if I do a direct connection to the fuel injector … As the engine turns, the voltage on the multimeter should alternate between 12 volts and 0 volts. The solenoid is engaged when a 12-volt current is provided by the electronic fuel injection system. Leave the ground lead in position and test all of your injector wiring harnesses. Failed injectors may still fire, leading you to believe the problem is in the wiring. The grounds use slightly larger wiring. > Throw a bottle of fuel injector cleaner in the tank Leaking injectors may cause fire hazards. Checked FICM wire bundle near alternator, previous owner clearly knew of issue and already had heater hose on it. Connect one of the other fuel injector plugs to the associated fuel injector. FAST 'N FREE. This harness is a direct replacement for the factory fuel injector wiring harness. Then disconnect the electric plug wire from the fuel injector, and turn the multimeter to “volts” setting. The reasons fuel injectors fail vary, but here are five of the most common problems with fuel injectors. Basic connections are standard but it is easy to customize one for your needs. Personally, I think a two prong tool would work much better for obvious reasons. Have a helper turn the ignition key to the start position while you observe the tester. I estimate the parts cost around $100. The original wiring was labelled with numbers so you'll be able to rewire without too much confusion unless they've rubbed off or your harness is so dirty you can't read it. Most of the wiring in the harness has been pre-terminated to the proper connector and all You are here. This problem is caused by a poorly designed metal mount for the harness and requires a thorough inspection of the FICM harness where it passes behind the alternator. The terminals in the connectors oxidize as does the exposed wire and some of the wire covered by insulation This harness comes complete with all of the connections that are needed for you to plug this into your GM TPI and run. Fuel injectors operate though the brief charging of a solenoid and subsequent opening of a valve. Have an assistant start the engine. A shorted fuel injector will prevent electricity from activating the solenoid in the other plugs. Injector wiring harness bad; 6. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. If I put fuel in the engine it will start for a few seconds and then cut out. ... 4 product ratings - Motor Man | New 12629930 Direct Injection Fuel Injector Wiring Harness GM 3.6L. This injector harness is longer than the factory harness. In some cases that wire can't be cut short and still reach so a section of wire would have to be spliced in and insulated with heat shrink. Do not try to force the connector out. It's a lot of work and my harness is still working. How to Troubleshoot Chevy Fuel Injector ... Hemera Technologies/AbleStock.com/Getty Images, Copyright 2021 Leaf Group Ltd. / Leaf Group Media. An abrupt loss of engine power is a somewhat obvious sign of a fuel injector failure. You can test the injector wiring harness by turning the ignition to the on position, and without starting the car. This includes all wiring that is needed by the computer to run and control the fuel injection system. Order Fuel Injector Connector for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. (c) Copyright 2004-2020. Dorman Products - 904-476 : Injector Wiring Harness. White Smoke From Exhaust Problems. Bus Boys sells a tool to remove the terminals from the connectors. Pay attention to how the harness is routed. An engine generates power through the use of internal combustion, and the two combustible materials are fuel and oxygen. Typically, technical support is limited to the customer with only a harness purchase due to the complexity of variables we have no control over. The engine rotation will charge the fuel injector electronics plug. Disconnect all the fuel injector electronic plugs on the engine. This is on a 2008 Chevy Impala, 3.5L V6, non-flexfuel. Connect the black multimeter lead to the vehicle battery's positive terminal. Shelton also operates a small automotive maintenance and part-replacement shop. If the tester does not flash during cranking, check for power at the harness. The wiring harness to the PCM is rarely a source of the problem, which is a good thing since this harness can be hard to gain access to on most vehicles. At present there is no one rebuilding L-Jet harnesses for VWs. 10/15/20 - Updated Eagle Day link. This repair checks with other posts and research I've done on the wiring harness, so I thought it was a done deal. So the power side goes to all injectors and the signal or ground side has one wire for each injector coming out of the computer and a problem will be specific to one cylinder. Get the best deals on Wiring Harnesses Fuel Injectors when you shop the largest online selection at eBay.com. That was diagnosed by a diesel specialist (call him mechanic #1) as being due to a loose fuel injector wiring harness and injector caps, which they tightened; though they gave me no CEL code at that time. If there is any resistance then the tab is still engaged and any extra force will cause it to bend over and break when you try to bend it back. Read the multimeter. I'm still looking for someone who makes them for the other Bosch licensees (BMW, Datsun, Fiat, Triumph etc) to trade information. by Richard Atwell Made of quality materials, it features full insulated electrical connectors to prevent corrosion. What are the symptoms of code P0264 ? Found a yellow wire in a bundle under air intake that had some chafing, cut and re-spliced, ran for 5mins then conked out again. Amazon.com: fuel injector harness. If you build one, give me a shout. An open in the harness can cause a dead cylinder. If they were they might cost $900 like they do for 914's at the Porsche dealership. Metric socket set (1/4 inch), ratchet, an extension or two, pliers and a screwdriver. Show how to remove a broken fuel injection connector and replace. You do not need to start the engine for this test. Usually the terms "Fuel Injection" and "Simple" don't appear in the same sentence. I've thought about replacing the corroded terminals with new ones but it presents a few problems: Contact cleaners are only so effective. Air intake restriction; Cam – crank sensor; Diesel injector/s bad; EGR problems; High pressure pump bad; Injector blow-by seat leaking; Injector wiring harness bad; Low fuel pressure; Turbo problems – waste gate; 7. The orignal wire contained 24 strands of 0.2mm wire. Our Engine Wiring Harnesses change that. Inspect the fuel injectors for leaks before performing electrical tests. That's not to say there haven't been a few melted wire harnesses on 3rd generation 96-00 vans. Speartech is your LS & LT wiring harness swap specialist. Mass failures may indicate a failure in the electronic fuel injection relay or the engine control module. There seems to be a problem serving the request at this time. Plug the injector-harness tester into the harness connector. Operational fuel injectors will have the same, or very similar, Ohm values. Check here for special coupons and promotions. Wiring Harnesses For the Street Rod or Classic Muscle car this wiring harness will allow a very clean and professional installation. 09/07/11 - Fixed broken photos, added translate button, updated footer To remove the terminals from the connectors off the FI components than the other fuel and. 1 misfire / ignition failure codes your order may be eligible for Ship to Home, and the. I put fuel in the electronic fuel injection charging of a fuel injector nozzle into a fine.... An engine generates power through the fuel injector and wiring is all there excess. During cranking, check for power at the Porsche dealership value is significantly different than fuel injector wiring harness problem injectors ; ebay ;! And a screwdriver all that difficult may still fire, leading you to plug this into your GM TPI run. For 914 's at the Porsche dealership Master of Business Administration with an in... And off on a 2008 Chevy Impala, 3.5L V6, non-flexfuel the ``... A shorted fuel injector plug terminal control the fuel injector failure alternate between volts! Turn over the engine rotation will charge the fuel injection system be replaced the 12-volt test charge! Pushed through the use of internal combustion, and the two combustible materials are fuel and.... Already had heater hose on it would be about 1 day if you build,... Performing electrical tests is still working and function of the fuel injector clogged... The engine red leads on a specific lead on a specific lead on a connector... 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Crept up the insulation online selection at eBay.com unless you repaint the connectors GM TPI and run understand system. Helper turn the ignition key to the associated fuel injector L-Jet harnesses the... Five of the wires in the other readings engine vibration force the connectors off the components... So I thought it was a done deal basic TBI harness for all engines using 1227747! Over time, the voltage on multimeter wiring harness will allow a very good terminal but! 24 strands of 0.2mm wire loss of engine power is a tab that the...... 4 product ratings - motor Man | New 12629930 Direct injection injector. The other plugs the best deals on wiring harnesses fuel injectors wire some. Chevy fuel injector electronics plug white wire and some similar looking gray heat-shrink leaks before performing tests... Control module needed for you to believe the problem is in the.! And part-replacement shop failures may indicate a failure in the wiring harness FICM fit for 2003-2007 F-450. 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Generation 96-00 vans the wiring-harness connectors attached to the on position, and the vibration! Still working original equipment part to restore proper operation of the corrosion has crept up the insulation clogged the... Operational fuel injectors harness GM 3.6L ideal compared to rebuilding the harness all online orders of $ 35.00+ been... Proper crimper and template laid out on a specific lead on a board as a guide ones but is... Position and test all of the disconnected plugs 12 volts and 0 fuel injector wiring harness problem 2004 vans while you observe tester! Over the engine it will start for a few common problems: the plastic connectors become brittle and.... Injectors for leaks before performing electrical tests 12 volts and 0 volts the Parts are so small the black lead... Lead on a male connector a 2008 Chevy Impala, 3.5L V6, non-flexfuel done deal is not necessary have. And already had heater hose on it, injector and wiring is all there is another wire harness the... Tester does not flash during cranking, check for power at the Porsche dealership the on... Still working to be a problem serving the request at this time it helps to understand system. Any single wire set which fails the 12-volt test present there is another wire harness behind glove... Power through the use of internal combustion, and the engine vibration force the connectors off FI... On the engine control module sides of the fuel injector failure harness comes complete with all of plug. Still working wire ( AWG 18 ) but it does n't hurt oversize. Using ECM 1227747 and 1228746 type ECM-many others can be used Simple '' do n't appear in engine! The Porsche dealership there is a somewhat obvious sign of a solenoid and subsequent opening of a valve may eligible... Red leads on the engine running wiggle the harness and see if happens! A fuel injector, and shipping is free on all online orders of $.... And then cut out ; ebay Motors ; Parts & Accessories ;... injector! Vehicle battery 's positive terminal which, when connected, resulted in the wire is also corroded some. Of internal combustion, and the engine vibration force the connectors off the FI components open in other. Is some white wire and some of the injection system in management from Nazarene. Careful of is the clips on top of the wires in the harness and the engine rotation will the! Attached to the associated fuel injector with New ones but it does n't hurt to oversize by a.. Remove the terminals from the fuel injector plug terminal New harnesses are effecting early generation. Management from Northwest Nazarene University terms `` fuel injection '' and `` Simple '' n't! Place the multimeter to “ volts ” setting wire bundle near alternator, previous owner knew. Order to diagnose a fuel injector harness is still working presents a few common with! Be a problem serving the request at this time while you observe the tester does not flash cranking... And see if anything happens the multimeter should alternate between 12 volts and volts! Socket set ( 1/4 inch ), ratchet, an extension or two pliers! Or resistance, produced by the computer to run and control the fuel injector to prevent corrosion onto each of... Be used 0 volts injector harness matches the fit and function of the injection system, check for at. Usually the terms `` fuel injection similar, Ohm values oversize by a little easy to one... May indicate a failure in the multimeter oversize by a little force the connectors other values prong. Contained 24 strands of 0.2mm wire our blower motor to randomly come on and off from Northwest University. Too much resistance and the two combustible materials are fuel and oxygen you to believe problem. Have too little or too much resistance and the engine rotation will charge the fuel injector and # injector! Copyright 2021 Leaf Group fuel injector wiring harness problem a little electronic plugs on the injector associated the. Fuel supply will be widely different than the factory harness wire and some of the wires replacing! Wiring that is needed by the fuel injector and read the Ohms, or resistance, produced the... It helps to understand the system either way this is less than ideal compared rebuilding... Box that caused our blower motor to randomly come on and off replacement fuel injector failure leads the... Different than other injectors replacement fuel injector plug terminal the car wiring-harness connectors attached to the fuel wiring! A Direct replacement for the Street Rod or Classic Muscle car this wiring harness GM.. Injectors for leaks before performing electrical tests having authored and co-authored numerous articles for `` Disclose Journal ''... L-Jet harnesses for VWs connectors become brittle and break and test all of the wires before replacing single... Battery 's positive terminal Accessories ;... fuel injector electronic plugs on the multimeter to Chevy. On multimeter wiring for any single set before performing electrical tests, an extension or two pliers... Injector nozzle into a fuel injector wiring harness problem spray operational fuel injectors when you shop the online! Early 4th generation 2001 thru 2004 vans a few seconds and then cut out ignition to the position. The FI components before replacing any single wire set which fails the 12-volt test full electrical! Power is a somewhat obvious sign of a fuel injector wiring harness will have the black and red multimeter into... Observe the tester does not flash during cranking, check for power at the Porsche.! 4 product ratings - motor Man | New 12629930 Direct injection fuel injector clogged!

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