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Posted by Matt (93SE) on August 27, 2002 at 12:30:35:
In Reply to: I need HELP!! I'm this close to burning my Maxima!!! posted by Mr. G on August 27, 2002 at 11:05:38:
(Also, the idle was extremely rough. it was constantly missing on cyl #4 and sometimes on #3. ran like a lawnmower at idle. at part or full throttle, the problem dissappeared after a sluggish start.) FINALLY, I just gave up and took it to a dealer and paid them $75 to diagnose the problem. Their estimate to fix: $550, parts & Labor.
My wife's light came on her 97 Alty several months back, and we took it to several places that hooked it up to Snap On scanners and various other brands of diagnostic equipment, but they never had any error codes. Even when they reset it, the light never went off.
CONSULT II system said a misfire in cyl #4. (Well no DUH! I didn't need a computer to tell me that!)
But the dealer was smart enough in working on these cars to do a vacuum test. sure enough, Cyl #4 had a vacuum leak- a very common problem in this car due to a leaking intake manifold gasket.
I told them no thanks, and ordered the parts from Courtesy for $9. 6 hours of work later, I had the manifold off and the dealer was right. you could see the oil and gunk on the gasket where it wasn't sealing on the cyl #4 port.. I replaced the gasket and got everything back together. idles perfect now, and has more power than it ever did! :)
Anyway, the whole point is that
1: it could be a leaky manifold gasket. I found that was the case on more than one Nissan (My 93 GXE Maxima parts car, and the wife's 97 Alty.)
2. the dealer will be able to find the code that's causing the check engine light to come on.