Question about 1992 Chevrolet S-10 Blazer

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Improper combustion I have a 1992 chevy blazer with a 4.3 vortec engine. blazer is running rich, revs high in gear, gas in oil,runs funny not quite a miss,poor mpg, changed plugs,wires,& EGR gasket.

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Hi jeffnedland,
These engines have the fuel injector and regulator inside the intake manifold which kind of looks like a spider with six legs one to each cylinder and the regulators are known to leak which will cause the engine oil to get contaminated with fuel. You will have to remove the upper intake manifold to get access to it, also the supply and return lines to the injector assembly are known to have hair line cracks so inspect them carefully and if not sure replace them also.
If you have any further questions feel free to ask.

Posted on Nov 23, 2008

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My first question for you is the engine light on and if so what is the engine code?

just from what you have told me i would suspect the fuel pressure regulator.
firts thing i would do is pull the vacuume line off the regulator and it should be dry.
turn the key on and where the vacuume line attaches should stqay dry (no fuel)
if you have fuel there your diaphram is bad and you need a new regulator.
it this isnt your problem you will need to check your fuel pressure. and you will need to see if whn you turn off the switch that it holds pressure. if it doesnt you may have a bad fuel injector just dumping fuel into the cylinder. if this is so you can remove your spark plugs and then you will know the one that is bad.
if you need more help[ let me know
later paul

Posted on Nov 23, 2008

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