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Re: 89 C 3500 7.4l TBI with issues
Quote:
Originally Posted by Bigpapa@murph
I'm messing with the same issue. 1992 gmc 3500 7.4l. This engine is rebuilt bored 30 over stock cam it is running 229 degrees. Cant get it down. New water pump new fan clutch new radiator the water wont return into the expansion tank. I reset timing to factory setting after unplugging set timing wire. I pulled intake and heads gaskets looked good was running lean and found vacuum line going to egr valve broken. I'm about to pull my hair out with this thing.
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Welcome to the board!
Are you getting the 229 degree reading from the temp gauge or from the ECM data?
Did you set the timing to Zero or 4 degrees BTDC?
Does your truck have a canister purge valve? I have run across several 1 ton trucks leaking vacuum at the canister purge valve.
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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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