Hesitates & starts hard after it is warmed up 1992 5.7 gmc truck
I have replaced the fuel pump, coolant temp sensor,fuel filter, fuel pump relay,injectors,fuel pressure regulator,as well as plugs wires rotor and cap. when hooked up to the scanner everything is perfect.could the computer be wacked out?
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without actually hooking up a scan tool and looking at the pid data i would say you have either a coolant temp sensor issue or intake air temp sensor issue.i have seen alot more coolant temp sensors bad than the intake air temp sensors tho.
U MAY HAVE A DEFECTIVE ENGINE COOLANT TEMP (ECT) SENSOR, U NEED A SCAN TOOL TO TEST THIS PART, THIS IS NOT THE SENDER FOR THE TEMP GUAGE THIS IS THE SENSOR THAT TELLS THE FUEL INJECTION COMPUTER HOW COLD OR HOT THE ENGINE IS, IF IT READS LOW THE SYSTEM WILL GET TO MUCH FUEL AND CAUSE A HARD START, DO U NOTICE ANY BLACK SMOKE WHEN IT FINALLY STARTS?
Try a full tune up.. get Bosch platnium+4 spark plugs and Acel wires, do the fuel filter and air filter(i suggest K&N) buy some fuel injector cleaner or use Marvel Mystery oil. The ECU could e gone but hard to diagnose if the car needs a tune up.
I should not drop more than 5 psi overnight, if it does it lets the fuel drain back to the tank, this causes long crank times because the pump has to refill the lines and filter before injectors get fuel.