injector wiring
Thread Starter
Melting Slicks
Joined: Oct 2001
Posts: 2,315
Likes: 110
From: Brandon Fl
injector wiring
How can you tell which wire plugs to which injector? I've had them all off and now the car runs rough and I think I might have crossed some of the injector wires. Any ideas? BTW it is a 88 L-98. Thanks
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Re: injector wiring (Steve87VETTE)
Actually on your 87 vette it is a bank to bank fired system. Meaning that the ECM fires a bank of injectors consisting of left and right banks. The left bank are 1 3 5 and 7 and the right 2 4 6 and 8. The right bank has a pink/black wire on one side of the connector and a light green wire on the other, while the left side has the same pink/black on one side and a light blue wire. Mixing them on connectors on the same bank should not make any difference. As they are fired together. You should double check and make sure that the connection is good to each of the injectors.
[Modified by tjwong, 6:02 PM 12/14/2003]
[Modified by tjwong, 6:02 PM 12/14/2003]
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: injector wiring (Steve87VETTE)
Your L98 has a dual batch fire injections system, that is, each bank of 4 injectgors is fired at once. So exact wiring along one side has no effect on performance.
Just be sure that the specially shaped cold start injector connector is on the cold-start injector and not on one of the regular injectors.
Look to other things that you have touched for the rough run cause, especially vacuum lines and spark plug wires.
Just be sure that the specially shaped cold start injector connector is on the cold-start injector and not on one of the regular injectors.
Look to other things that you have touched for the rough run cause, especially vacuum lines and spark plug wires.
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Re: injector wiring (65Z01)
Go to your local Sears store and buy a mechanics stethoscope as they cost about $15. Put the metal probe on each injector as the engine runs and listen for a "consistent" noise on each injector. If you do not have good connection on an injector, you will hear it. Hope this is helpful.
Race Director
Joined: Aug 2000
Posts: 14,130
Likes: 7
Cruise-In II Veteran
Re: injector wiring (Steve87VETTE)
Another simple way to see if the injector harness is plugged in correctly is the the very first plug on each end goes to the first or last injector across from it and so on,so on.If you crossed them the plug in wires would cross each other and make an X.They should go on sort of straight across from where theyre at.You really cant plug them wrong anyways.I siwtched the plug ins before to try and track down a bad injector by testing the firing of the harness.If everythings up to par,it wont run any different crossed.
:)
:)
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: injector wiring (Steve87VETTE)
To help locate a bad injector unplug it and measure static resistance.
Each injector should show around 15Ohms; any that deviate much should be suspect.
Each injector should show around 15Ohms; any that deviate much should be suspect.
Thread Starter
Melting Slicks
Joined: Oct 2001
Posts: 2,315
Likes: 110
From: Brandon Fl
Re: injector wiring (65Z01)
To help locate a bad injector unplug it and measure static resistance.
Each injector should show around 15Ohms; any that deviate much should be suspect.
Each injector should show around 15Ohms; any that deviate much should be suspect.
Quick dumb question. Would that be taking a measurement at the injector with the car off? The injector not the plug right?
thanks.
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Instructor
Joined: Aug 2003
Posts: 107
Likes: 0
From: Aurora OH
Re: injector wiring (65Z01)
FWIW -
My mechanic told me that I should measure the resistance for each injector after running the engine a bit. The resistance has a tendency to change when the injector is warm - and this will help identify resistance differences...
My mechanic told me that I should measure the resistance for each injector after running the engine a bit. The resistance has a tendency to change when the injector is warm - and this will help identify resistance differences...
Melting Slicks
Joined: Jul 2003
Posts: 2,384
Likes: 124
From: Reno/Sparks Nevada
Re: injector wiring (Steve87VETTE)
I have an OTC fuel injector tester. Basically, you pressurize the fuel rail by turning the key on then off then pinch off the return line to eliminate bleedback to the tank. Then disconnect the injector connector, hook up the fuel gauge, attached the tester to the battery and injector, then look at the pressure gauge to see how much fuel is spraying when pulsing the tester. Tester allows 3 different pulse widths. Easy to use and for $65 I'll ship it for free to the lower 48.
