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Old 09-06-2009, 10:10 AM   #1 (permalink)
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Default Bad fuel injector ground??? Help?

Hey everyone, very new to this forum. I am going to be purchasing a 91 Stealth R/T this upcoming week. The car has a CEL on, and the current owner is telling me it was determined to be a "bad fuel injector ground". Does this sound legit? I did a search but did not come up with anything.

If someone could shed some light on this and let me know if his diagnosis was correct, or if not, would it could possibly be, that would be very appreciated. I'd like to get the car on the road ASAP and I know it wont pass NYS inspection with that light on the dash, and Id also like to get the issue fixed to prevent any problems further down the road. Thanks in advance!
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Old 09-06-2009, 10:17 AM   #2 (permalink)
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Default Re: Bad fuel injector ground??? Help?

There's really no way for us to tell with out knowing what the actual code is. Is there anyway that you could get the actual codes from the computer and let us know what they are? That way we'd know if the code was even related to anything like that. It would also be helpful to know the model and year 3s that you're looking at.

I personally have never heard of a car tripping a CEL due to a bad injector ground, but I could foresee it happening if one of the injectors isn't firing consistently due to the ground.
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Old 09-06-2009, 10:23 AM   #3 (permalink)
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Default Re: Bad fuel injector ground??? Help?

It is a 91 Stealth R/T, not the twin turbo model. All I have to go on is what he has told me so far, I won't actually have the car until next weekend.

The owner said a couple of times the car has given him some issues starting up, like that it will sputter a bit. But he said if the car is turned off and back on it fires up no problem. I started it twice when I went to go look at it, as well as took it out for a quick ride and it didn't give me any problems. Could it just be a bad injector?

This is why I made the post, I havent seen anything injector ground related in the searchs I did, so I'm just trying to get a general idea of what could be wrong with the car.
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Old 09-06-2009, 10:55 AM   #4 (permalink)
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Default Re: Bad fuel injector ground??? Help?

It is possible that a bad injector ground could cause that, but there's also many other things that could cause the sputtering on startup. Without anymore information than that there's just no way to guarantee you that's what's causing the problem.
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Old 09-06-2009, 10:32 PM   #5 (permalink)
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Default Re: Bad fuel injector ground??? Help?

I've never heard of an actual injector ground. There's only one ground strap on the rear of the intake. But I would think the caps in the ECU are probably bad. I have a couple ECUs or you can replaced the caps if you know how to solder.
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Old 09-07-2009, 03:50 PM   #6 (permalink)
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Default Re: Bad fuel injector ground??? Help?

Alright thanks for the imput guys. I'll fill everyone in some more after I get the car. Hopefully I'll be bringing it home on Saturday, and putting it on the road Monday. Then I just need to get rid of that pesky CEL to pass inspection in under 10 days...
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Old 09-07-2009, 04:00 PM   #7 (permalink)
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Default Re: Bad fuel injector ground??? Help?

The injectors are grounded by the ECU... Failed injector drivers are not uncommon. It's quite possible the car owner didn't have a solid grasp on what he was told by whoever diagnosed the problem.

I would not be surprised to see an ECU problem as the root cause.
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Old 09-07-2009, 05:08 PM   #8 (permalink)
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Default Re: Bad fuel injector ground??? Help?

RealMcCoy, if the ECU is the problem, how big of a problem exactly would that be to fix? Like in relation to time/difficulty/money?

Also a quick side note, if I have to pass inspection in under 10 days, and its something that is going to be a little more labor intensive than cleaning up some connections on ground wires, is there an easy way to get rid of the CEL just to pass?
I used to have an 2004 Lancer Ralliart, and the trick used to be to pop the battery terminals off for 5-10 minutes and put them back on, CEL would temporarily clear and it could pass NYS inspection, and that was with OBDII and having to be hooked up. Would this work on the 91 Stealth? I realize this wouldn't resolve the problem, but it would help me to put it on the road. Thanks again guys.
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Old 09-07-2009, 05:34 PM   #9 (permalink)
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Default Re: Bad fuel injector ground??? Help?

Do they just check to see if the check engine light is on are do they actually watch it when you start the car to make sure it comes on and then goes off? If they just check to see if it's staying on then you could just pull the bulb out, however this would obviously cause it to never illuminate.
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Old 09-07-2009, 06:03 PM   #10 (permalink)
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Default Re: Bad fuel injector ground??? Help?

They pull it in to the bay, I know on the newer OBDII cars, it is hooked up and scanned if the light is on or off, doesnt matter.

From what I have heard, pre-1995 stuff is simply a safety check and a visual check for the CEL, and if it is not on, nothing is further checked into. But that is only what I have heard. Hopefully this is the case and the bulb can just be removed then so that I can pass.
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