GMC Repair Questions? Ask a Mechanic for Answers ASAP
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When was the last time the engine had a complete tune up?
Does the engine ever stall on you at all when driving?
How does the engine idle under a heavy load?
Hello Amedee. Please define a complete tune-up.
If by driving, you mean in motion, no it hasn't stalled - but has at idle (parked, stop sign).
I just drove around the last two days with about 500 pounds of shingle waste before disposing and it generally handled the load fine.
Are you no longer concerned with whether it has a MAP or Mass Airflow sensor? How would I determine this?
I have not checked the fuel pressure and have no way to do so without going to a local shop.
I could be wrong but my investigation indicates mass air flow sensors were used in 1996 and later models. A MAP is used for the 1993 4.3L (Vin Z) engine but I could not confidently locate it. In any event there is no sensor located in the air intake assembly other than the thermostat for the flexpipe leading up from the exhaust manifold.
I will have to see if I can get my mechanic to check the fuel pressure later this week.