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Re: 89 C 3500 7.4l TBI with issues
On a 1992 TBI big block the fuel pressure spec is 9 to 13 PSI. When the system is in good condition they do not run at the low end of the spec.
If the fuel pressure is low it will be running lean at least at times.
A lean mixture burns hotter. Much hotter. It can burn a hole through a piston.
I would expect to see a coolant temp of 195 to 220 degrees with some load.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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