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Old 05-03-2008, 11:43 AM   #1
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2004 GTO Owner

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Location: Troy, MI
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Question Left bank not firing.

So here is a new one to me. First off I don't have a scanner handy this weekend and the check engine light has been on for a while since I did some exhaust work and haven't had a chance to tune it right. So last night I was driving home and the car seemed to be fine, after 5-10 minuets on the highway the power completely dropped off and the car started shaking badly. It did idle but barely, I got it back and checked under the hood. As I was checking for spark and fuel I pulled one of the left side fuel injectors and there was no change in the idle, when I tried this on all the right side injectors the idle speed dropped noticeably but none of the ones on the left side did this. I checked the under hood fuse box and found the 15A fuse for "engine sensors" blown but swapping that did no good. Just curious if anyone else has ran into something like this, I checked the ground on the block but it seems clean and tight. I'll have to get a scanner on it Monday and see what's happening if nothing else. Thanks for any information.
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Old 05-09-2008, 12:10 PM   #2
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2006 GTO Owner

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Location: Boiling Springs, PA
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This did in fact happen to me once. Mine was right bank.
It was fuse block related..there are 2 fuses for the injectors (INJ1 and INJ2 i think).

mine had a add-on circuit on one of these, that apparently had flexed the fuse connection tabs a little too far. When the circuit was removed from that fuse, there wasn't enough pressure being applied to the legs of the fuse to make contact. Basically the add-on circuit flexed the fuse holder contacts and yielded them..reducing the contact force on the legs. Fuse would pull out without much resistance.

I ended up sticking a very small flat head screw driver in there and bending the contacts back together one-by-one. The fuse then went back in tightly, and problem hasn't been back since.

Start by checking those INJ fuses and wiggle to see if they are tight. If not them...maybe pinched wiring somewhere to that bank ?
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Old 05-09-2008, 12:27 PM   #3
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A blown fuse is usually an effect, not a cause. It blew to protect whatever it was in line to protect. when replaced did the new one blow too?
I have no relevant information on this subject at this time...
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