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Originally Posted by kb3jhp
i have a 1996 olds bravada 4.3with 89000miles i use pure1 filter with mobile 1 5w30. in the morning i will start it and makes no noise at idel. but whene i pull out and rpms hit about 2600 it makes a knocking sound it almost sounds like a diseal engen. what could it be my 1996 blazer did the exat same thing.i am hoping it is not a rod bearing
mods
hypertech tuner
k@n FIPK)
gibson catback
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Sounds more like valve tap... Run some seafoam through the system and do a full tune up. Also try running a bottle of octane booster through the fuel system. Also try allowing the motor to run a minute or two before driving....