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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Either the oil filter gasket blew out due to a stuck pressure relief valve or if you just changed the filter then you left the old filter gasket on, they do stick and sometimes get missed. other possibilities are a hole in the oil pan or an oil pressure sending unit that has come apart..
Is this the Vortec engine? If so, the fuel injector spider, has a built in pressure regulator and i would say it is spraying way too much fuel into the cylinders. At the same time is is washing your cylinders of lubrication, and that itself is not good.
A spider injector is located underneath the intake plenum and this is multi-port. Otherwise you have a throttle body injector system. Vortec engines have spider injectors and they are super expensive to replace ($400.00- 850.00) each ! There is only one spider injector for each engine it has 6 legs/fuel tubes that go to each cylinder.
first try the evapertator cansister valve is open and aloowing to much fuel in the engine, also the fuel injector could be leaking and pushing to much fuel intothe intake, this will wash out the cylinders and put gas in the oil, two things can case this a bad injector or a defective fuel regulator in the injector.
spider type fuel delivery inside upper intake known to leak , and with repeated attempts to start , fuel gets into wherever gravity will allow , be sure to drain fuel soaked oil before attempt to start after repair and because fuel is in the exhaust , it might blow the muffler and melt the catalytic converter
have 1994 4.3 cpi and the problem I had sounds same.
It was a leaky pressure line in pletium . easy fix $45.00 part $15.00 gasket.
the leak was caused from the fuel lines rubbing together in pletium.
take the vortec cover off ,then remove air regulator in middle and look inside . I turned on power to key and gas spray came from drivers side of pletium looking in hole.fuel line side. if gas spray on passanger side then gas regulator faulty. takes 5 min to check
After fixing truck runs runs great. no more gas smell in cab.
also you can smell oil for gas
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
these vehicles are known to have problems with the fuel pressure regulator/and also fuel pump. you need to hook up a fuel press gauge to see how many lbs.ther are. being off 1-2 lbs.from spec will cause a no start that will drive you crazy.