1998 Chevy Silverado 3500 7.4 starts hard when warm
Recently purchased this vehicle and have replaced the fuel pump, spark plug wires and plugs, cap, and oil pressure sender. We have had it into the shop and on a computer but no codes come up. It acts like it is flooding when you try to start it while the motor is hot. I am at a loss. Thanks!
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Re: 1998 Chevy Silverado 3500 7.4 starts hard when warm
I'd check coolant temperature sensor, it should be at center, front of engine. Not 100% sure on your vehicle, but on some I've worked on, the coolant temperature sensor was faulty, basically telling vehicle computer that engine was still cold, so dump more fuel.
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What's missing ? Fuel ,spark , compression ? How many miles on the vehicle ? Does it have spark , pull a plug wire while cranking an hold it near a good ground . Put a fuel pressure gauge on the vehicle , is there fuel pressure ? Do a compression test , 150 psi . engine mechanical problem . timing chain .
Check spark plugs, leads, distributor cap & rotor arm, fuel pump, fuel filter, coil pack(s), relays, replace any items that are suspect IE Fuel filter which has probably not been changed since new even though they should be changed on all vehicles every 18 months, all of this can be done at home & will save you a lot of bucks in mechanic/garage fees,
SONUDS LIKE IT MAY BE VAPOR LOCKING, DID YOU RECENTLY HAVE ANY EXHAUST CUSTOM WORK DONE? MAKE SURE FUEL LINES ARE RAPED WITH INSALATION AND WIRE TIES ANY WHRER FUEL LINES MAY BE NEAR EXHAUST. ALSO CHECK FOR CODES MAY HAVE RESTRICTED CATALATIC CONCONVERTER GOOD LUCK B.HARRISA.S.E. CIRTIFIED 25 YRS. EXP.
I would check a few things:
Load test the battery. If its got any age on it at all, this could be the culprit.
Test the starter.
Check for loose connections at the distributor cap. Make sure the rotor in the cap is seated and that the cap is properly seated.
Check for loose connections on the battery, the starter and make sure you have fuel pressure on the injector rails (key on, detent the shrader valve .. you should get fuel).
replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump
Just from what you said it sounds like your vehicle might not be holding its residual pressure which means after you turn a vehicle off, your fuel injection system should hold a certain amount of pressure in the system, but if that pressure drops to fast your vehicle may have a hard time starting. Things to look for when you lose fuel pressure is the fuel pressure regulator may be leaking, fuel pump check valve,leaky fuel injector or they maybe a small leak in one of the fuel lines. I only suggested this cause i had a car with the similar problem.