Question about 1994 Chevrolet S-10 Blazer

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Knocking after fixing fuel in oil problem

I have a 94 Blazer 4x4 4.3 vortec CPI and recently changed thefuel pressure regulator because it was dumping gas in the oil and now that issue is solved and a new one problem has risen. I have a severe knocking on the top half of the engine. Could it need new valves etc from the burnt oil and gas problem?

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  • Shawn Hill Mar 04, 2009

    This is for pierre235. Yes I did change the oil and filter afterwards, but it still knocks and i took the valve covers off and the #5 and 6 cylinders are not gettig oil. Thank you,shawndhill19



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You did change the oil after all that gas whent in the oil let me now pierre p.s dont rate thanks for trying

Posted on Mar 01, 2009

  • pierre laplante Mar 06, 2009

    i would check the oil pressure in the engine maybe to mush gas in oil and oil pump was damaged good luck pierre p.s sorry for the delay



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Good luck to all.

If any one finds any thing out please let me know!

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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

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