I have a 1992 C1500 Suburban (4x2) with a 350 TBI engine. Has about
250k miles on it but well maintained. 3 year old tranny.
Been having cooling problems. Found out radiator was plugged and over
50% was not flowing. Bottom half of rad was COLD while the top half
would burn you. Replaced the rad. NO evidence of blown head gasket.
Oil looks good, coolant looks good. No knocks or pings.
After about 30 minutes of driving, the oil pressure drops to almost
dangerous levels and there is a significant loss of engine power.
Where the truck could make a hill with 20% throttle in OverDrive it
would now take 50% throttle in 3rd gear if hot. MIL is not on. Any
Does the temp gauge now indicate acceptable temperature?
First I would definitely check that oil pressure with another gauge.
Since the engine has 250k miles on it it could simply be worn bearings
and / oil pump, and hence the entire engine may need rebuilt before
spending any money trying to find / correct the power loss..
Depending on how old the catalytic converter is I think that is a
possible cause of the power loss and many exhaust shops will check that
for free anyway.
On Oct 2, 12:16 pm, firstname.lastname@example.org (James Goforth) wrote:
Yeah the temp gauge is fine now. Temperature never exceeds 205.
Mechanical gauge is more accurate (electric one jumped a lot with
RPMs). Only low pressure at idle (5-10psi). Normal driving puts it
around 20-30psi when hot (50-60 cold) which I know can be low but like
we've already established, it's got some wear on it. But I do notice
the power loss when this lower pressure occurs. I plan on replacing/
rebuilding the engine early next year but I'd like to think I can at
least make it through the winter. Thanks for the help and any other
suggestions you may have.
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