The thing to be careful of is the clips on top of the injectors. The wiring harness will have two terminals that the prongs on the injector insert into. 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. As these harnesses get older they suffer from a few common problems: New harnesses are not for sale. An open in the harness can cause a dead cylinder. Turn the multimeter to "volts." 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. 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. They should all be around 12 volts. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Read the multimeter. Melted injector wire harnesses are effecting early 4th generation 2001 thru 2004 vans. He holds a Bachelor in Science in education and a Master of Business Administration with an emphasis in management from Northwest Nazarene University. Steps to determine the source of the problem? Test all the fuel injector Ohm readings. Compare the value of each reading to the other values. Shelton also operates a small automotive maintenance and part-replacement shop. At present there is no one rebuilding L-Jet harnesses for VWs. Keep the multimeter attached to the plug. Connect the multimeter's red lead to one of the disconnected plugs. Yes, the PCM , injector and wiring is all there is. 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. ... 4 product ratings - Motor Man | New 12629930 Direct Injection Fuel Injector Wiring Harness GM 3.6L. (c) Copyright 2004-2020. Note the value or write it down. 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. 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. Because you are testing the current it is not necessary to have a specific lead on a specific side of the plug. Try Prime. 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. The solenoid is engaged when a 12-volt current is provided by the electronic fuel injection system. There seems to be a problem serving the request at this time. 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. Get the best deals on Wiring Harnesses Fuel Injectors when you shop the largest online selection at eBay.com. Replace the wiring for any single wire set which fails the 12-volt test. Labor would be about 1 day if you have the proper crimper and template laid out on a board as a guide. 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. $45.00. An engine generates power through the use of internal combustion, and the two combustible materials are fuel and oxygen. Our Engine Wiring Harnesses change that. The engine rotation will charge the fuel injector electronics plug. Disconnect the electronics plug wire from the fuel injector. Injector wiring harness bad; 6. Check here for special coupons and promotions. 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. Pay attention to how the harness is routed. The rest of the injectors are fine. Replacing the injector harness is not all that difficult. Leaking injectors may cause fire hazards. Skip Shelton has been writing since 2001, having authored and co-authored numerous articles for "Disclose Journal." Speartech is your LS & LT wiring harness swap specialist. The plastic connectors become brittle and break. Turn the ignition key to the "On" position. 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. Have a helper turn the ignition key to the start position while you observe the tester. The opened valve allows pressurized fuel to be pushed through the fuel injector nozzle into a fine spray. As far as tools, not much really. A failed injector will have too little or too much resistance and the Ohm value will be widely different than the other readings. Have an assistant start the engine. In order to diagnose a fuel injector problem, it helps to understand the system. Disconnect all the fuel injector electronic plugs on the engine. eBay; eBay Motors; Parts & Accessories; ... Fuel Injector Wiring Harness FICM fit for 2003-2007 Ford F-450 Super Duty 6.0L . by Richard Atwell A lower reading means there is excess resistance in the wire somewhere. All you need beside that is some white wire and some similar looking gray heat-shrink. Personally, I think a two prong tool would work much better for obvious reasons. Typically, technical support is limited to the customer with only a harness purchase due to the complexity of variables we have no control over. There is another wire harness behind the glove box that caused our blower motor to randomly come on and off. Get the best deals on Wiring Harnesses Fuel Injectors when you shop the largest online selection at eBay.com. This injector harness is longer than the factory harness. 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. Then disconnect the electric plug wire from the fuel injector, and turn the multimeter to “volts” setting. The engine draws in oxygen by way of the air intake and fuel from fuel injection. Remove them carefully and don't drop them. The Bosch connectors only come in black so you'll loose your color coding unless you repaint the connectors to match. 07/15/19 - Google update: new adsense code, removed defunt translate button 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 . The wire is also corroded and some of the corrosion has crept up the insulation. 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. 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. Failed injectors may still fire, leading you to believe the problem is in the wiring. That's not to say there haven't been a few melted wire harnesses on 3rd generation 96-00 vans. What are the symptoms of code P0264 ? Basic connections are standard but it is easy to customize one for your needs. Account & Lists Account Returns & Orders. The orignal wire contained 24 strands of 0.2mm wire. This is on a 2008 Chevy Impala, 3.5L V6, non-flexfuel. All Hello, Sign in. 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. As these harnesses get older they suffer from a few common problems: The plastic connectors become brittle and break. Operational fuel injectors will have the same, or very similar, Ohm values. It is not necessary to have the black or red leads on a specific side of the plug terminal. Place the multimeter leads into the fuel injector plug terminal. Much resistance and the engine they might cost $ 900 like they do for 914 's the! Failed injectors may still fire, leading you to plug this into your GM TPI run... 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