Question about GMC Cars & Trucks
7.4 vortec is hard to start when hot but starts when cold
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Posted on Jan 02, 2017
SOURCE: 98 Escort Hard starting when hot
sounds like a dodgy mis reading of a sensor caused by electrical resistance which is turning choke on and flooding engine.know the fault but without car in front of me its difficult to diagnose,could be auto choke sensor which is on right hand side of cylinder head ,but not sure.best is probally dealer have you tried spark plug gaps ??25th although this would cause problems with cold starting not hot starting but its worth a look
Posted on Nov 28, 2008
SOURCE: hard to start chevy 350 vortec
You will need to do a fuel pump pressure leak-down test, the pump must not loose more than 5 PSI overnight, u will need a cheap fuel pressure test guage, the test port is on the fuel supply rail to the injectors on the intake manifold, it looks like a tire valve but metal with a plastic cap on it, u may be able to borrow this guage from Kragen, Autozone or a parts store like them, if not they are very cheap, less than $20 US. Run the engine with the test guage hooked up, turn off the engine and then check it in an hour or so, if it drops more than 5 PSI then u will need to replace the fuel pump in the gas tank. One note make sure the connection for the guage is tight with no leakage or the test is invalid
Posted on Jan 16, 2009
Check fuel pressure, and regulator. A leaking regulator gives a warm engine more fuel [ it does not like it] a cold motor does. same as a flooded motor. Good luck
Posted on Mar 24, 2009
could quite possibly be a bad starter on your 4.3 .... i have had trucks and cars where .when the engine gets hot the exaust manifold puts heat on the starter making it harder to operate.... when the truck cools it will start no???
Posted on Aug 05, 2009
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