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Tricky Diagnosis on an '86 9kT
Posted by Craig [Email] (more from Craig) on Mon, 8 Mar 2004 07:57:07
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Hello all,
Here's a tricky diagnosis for the experts out there on a not-running-well '86 9kT with 109k I recently bought cheap to complement my trust '87 9kT.
The car starts and runs, but runs rough and displays a check engine light. There is a modest amount of white smoke coming out the exhaust which increases when I rev the engine. It doesn't smell like oil and I'm not sure what coolant should smell like, but it's not exactly sweet smelling either.
The car heats up very quickly and the temp gauge goes to near the red, again very quickly, though the thermostat doesn't seem to even open (I swapped in a new t-stat with the same results).
The car had low coolant when I got it, but the oil (on the dipstick) and coolant do not look contaminated. Cylinder compression is between 155 and 185, running roughly from cylinder 1-4.
I assume the headgasket it blown, but it strikes me as odd that the oil wouldn't be contaminated. I also don't think this alone would trip the check engine like (is there a way to diagnose the light?) Could the hot running temp be cause by anything other than the headgasket, given that the stat has been replaced?
Any help greatly appreciated!
Thanks all,
Craig
'87 9kT 273k - old faithful
'86 9kT 109k - new troublemaker
posted by 66.14.127...
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