Oil consumption and low compression
#1
Oil consumption and low compression
I have a 1999 Suburban with a 5.7L "R" engine (151,490 miles). Idles fine usually. Has new cap and rotor. Cylinders 3 & 5 have a bad dry oil foul problem (build-up) after 5k to 6k after replacement. There is also "valve ping" and I use about 1 quart of oil per week and it is driven very few miles. There are no coolant or oil leaks externally. Coolant levels are always consistant and I never need to add any. Compression test results are: all cylinders show 125-135 psi except for cylinder #3. It reads 95-100 psi. MIL comes on and scan tool reads cylinder misfire on #3 & #5. Overall, seems to run okay and doesn't lack power except for going up large hills or mountains. Then it loses power and chugs along.
I have been told: intake gasket, valve stem seals, valve guides, and piston rings. Any of these could be the culprit.
There is no smoke from exhaust pipe on cold start-up and no signs of smoke during hard acceleration on level roads.
The compression readings are most concerning to me.
Need an engine or is there a possible easier fix?
Does anyone have any thoughts on this?
I have been told: intake gasket, valve stem seals, valve guides, and piston rings. Any of these could be the culprit.
There is no smoke from exhaust pipe on cold start-up and no signs of smoke during hard acceleration on level roads.
The compression readings are most concerning to me.
Need an engine or is there a possible easier fix?
Does anyone have any thoughts on this?
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john1231989
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CamaroFan107
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September 18th, 2010 3:15 AM