Quote:
Originally Posted by Frankp87
98 K1500 with 350 and I have a loud "chirping" noise which at first I thought was a bad pulley or belt. Checked them and all are good. While running I pulled the dipstick and the noise went away. Put it back in and noise comes back.
I took the oil fill tube cap off and am getting a strong vacuum there. I can only figure that I have a bad intake gasket allowing vacuum into the valve covers.
Anyone have an idea ?
Thanks
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crankcase vent system does create a slight vacuum at idle. this may mean the PCV / crankcase system has a defect. PCV , hoses on pcv/crankcase vent collapsed /plugged etc...
with this PCV GM recommends replacement every 12,ooomiles. no one does that interval ..I replace at around 40,ooomiles. these valves[pcv] wear out ...then they suck too much..or if the engine is not properly maintained fouled with sludge..this then plugs them ...