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Running a little rich...
http://i856.photobucket.com/albums/a...psddljpcz1.jpg
Those black spots are coming from the ZR-1 when it is started up cold. I have also noticed it smells a bit rich too. The car still has cats, Borla axle back and deleted center resonator. I have heard it has a custom tune, but he chip appears to be stock. |
Re: Running a little rich...
If that continues at startup, it may be an injector housing gasket leaking coolant into an adjacent cylinder.
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Re: Running a little rich...
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Re: Running a little rich...
To the cylinder head. The top side gasket of the injector housing is normally referred to as the plenum gasket.
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Re: Running a little rich...
Afterthought: if the injector housing gasket is the source of a coolant leak, it will be into any of the front 2 cylinders on each bank, i.e., cylinders 1&3, 2&4.
A quick & simpler check would be performed on a cold engine after full warm up. Remover the plugs on the cylinders mentioned, pull the fuel pump fuses( both primary & secondary). Have someone crank the engine over & look for coolant blowing out of a cylinder. It won't be continuous, just a quick puff. |
Re: Running a little rich...
Probably silly thought: I wonder if someone could analyze that soot and tell its source (coolant/water, fuel, ...)
Maybe looking at the plugs would provide more clues, especially if 1 or 2 look odd while the others look good. |
Re: Running a little rich...
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I could never see it on the plugs because the amount was small and it only appeared in the exhaust at cold startup. |
Re: Running a little rich...
The plugs could also look steam cleaned.
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