Quote:
Originally Posted by latief
I am trying to reverse engineer a problem with my car.,,
I did the head-gasket a couple of months ago. head was checked for leaks and straightness, but all was good....
I remembered yesterday that when i did this, my piston tops were covered with wet carbon. i literally cleaned them to a shine by wiping them with a rag.....
exhaust smells.... yes, but not sure how to describe it. most strong on first start.... their is very minimal oil consumption if any....
so generally speaking, what will would have caused this at the time?
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Ahhh..
Piston tops...
Probably a carbon build up caused by an inefficient fuel delivery system.
Best to set your AFR ratio to factory spec.
If you were to pull all six spark plugs would they also be black/wet..
Should be a light dry tan color if AFR is correct.
Run a tier 1 gasoline or ethanol blend..whatever is available in your area..
The additives in the higher octanes should keep your injectors, valves and piston heads clean.
You can also use Chevron Techron added to the gas tank..
The Tier 1 gas contains a Techron or equal additive.
Adding to the tank hastens the "clean up' process.
If compression and leakdown is to spec, then probably an overly rich AFR...your spark plugs are the best indicator 