Injector factory wiring error?
Thread Starter
Racer
Joined: Mar 1999
Posts: 292
Likes: 0
From: Vienna VA
Injector factory wiring error?
Troubleshooting a minor backfiring problem on my 90', which has been there since I upgraded injectors, cam, heads and went to a mini ram...
If you look at each bank of four injectors, are the black (hot) wires always to the right with the Black/Green (ECM switched grounnd) or Blank/Pink (ECM swithched ground) on the left?
The above is what my Haynes and Chilton's manuals show. Black is always connected to pin A (right side pin of injector).
However, my 90' is not wired the same as the manuals. I noticed that the front two injectors on each bank have the Blk (Hot) wires on different injector pins than the back two injectors. Hot is connected to side A on some injectors and side B on other injectors.
Does is matter for injector operation, whether the hot is conected to one pin or the other?
If you look at each bank of four injectors, are the black (hot) wires always to the right with the Black/Green (ECM switched grounnd) or Blank/Pink (ECM swithched ground) on the left?
The above is what my Haynes and Chilton's manuals show. Black is always connected to pin A (right side pin of injector).
However, my 90' is not wired the same as the manuals. I noticed that the front two injectors on each bank have the Blk (Hot) wires on different injector pins than the back two injectors. Hot is connected to side A on some injectors and side B on other injectors.
Does is matter for injector operation, whether the hot is conected to one pin or the other?
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: Injector factory wiring error? (Carl90)
I would not think it would matter, and since you say it started since your mods took place, I would say its either a tune problem, or something wrong with the install of the components. Otherwise the problem would have been noticable from day 1. :cheers:
Thread Starter
Racer
Joined: Mar 1999
Posts: 292
Likes: 0
From: Vienna VA
Re: Injector factory wiring error? (ski_dwn_it)
I agree that it may not matter. Curious if anyone else is wired the same as my car and running with no problems.
I have had this problem from day one, but it may be a defective injector. I bought the injectors used through a friend, but I may have inherited someone elses bad injector.
I have had this problem from day one, but it may be a defective injector. I bought the injectors used through a friend, but I may have inherited someone elses bad injector.
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: Injector factory wiring error? (Carl90)
Did the car have the problems from day one, before the mods were done? Guess I did not read the first post correctly. It sounded like you said after you added the mods, the car started acting up. Can you clear this up. :skep:
Thread Starter
Racer
Joined: Mar 1999
Posts: 292
Likes: 0
From: Vienna VA
Re: Injector factory wiring error? (ski_dwn_it)
No problems before the mods.
I made the mods, but initially could barely get it to run. Took it to a mechanic and he made a injector wire harnes repair...said some wires got disconnected. Now the car run respectably well as you can see from my 1/4 mile times, but it still has a minor back fire problem.
I made the mods, but initially could barely get it to run. Took it to a mechanic and he made a injector wire harnes repair...said some wires got disconnected. Now the car run respectably well as you can see from my 1/4 mile times, but it still has a minor back fire problem.
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Re: Injector factory wiring error? (Carl90)
Those trap speeds are great! You should be running low 12s with those, get some slicks on that thing.
OK back to the problem at hand. The backfire is not right, I would talk to your mech who fixed the wiring harness and ask him exactly what he changed. If he messed about with the connectors, I would have him switch them back and see if it makes a difference. But if they were firing when they shouldn't be, I would imagine that car would run like crap no matter what RPM. But you never know. On these cars they batch fire one side at a time. Can you listen with a screw driver or something and hear if you are firing the injectors with the different wires the same as the correct wiring? You follow what I am saying? ;)
OK back to the problem at hand. The backfire is not right, I would talk to your mech who fixed the wiring harness and ask him exactly what he changed. If he messed about with the connectors, I would have him switch them back and see if it makes a difference. But if they were firing when they shouldn't be, I would imagine that car would run like crap no matter what RPM. But you never know. On these cars they batch fire one side at a time. Can you listen with a screw driver or something and hear if you are firing the injectors with the different wires the same as the correct wiring? You follow what I am saying? ;)
Race Director
Joined: Mar 1999
Posts: 12,586
Likes: 237
From: Bartlett Illinois
Re: Injector factory wiring error? (Carl90)
which side the wire is on should not matter as all that happening is when the Injector driver in the ECM pulses the wiring makes a complete path. since the injector is basically like a Relay (where the electrical part of the injector is a coil and it operates the open/close of the fuel) , it does not care which is hot and which is ground.
Have you Ohmed out the injectors at hot temp and cold temp?
Have you Ohmed out the injectors at hot temp and cold temp?
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Thread Starter
Racer
Joined: Mar 1999
Posts: 292
Likes: 0
From: Vienna VA
Re: Injector factory wiring error? (-=Jeff=-)
I did check ohms hot and cold and it was fine. I understand that some injector failures do not show up with a simple ohm check.
I plan to try another set of injectors this weekend.
I plan to try another set of injectors this weekend.