I have seen a lot of posts on a lot of sites that do not deal with this specific problem but are close. My 1998 GMC 5.7 L Vortec SFI motor starts fine when cold or it has been sitting over night but after I drive it for a while, until engine is hot, it starts as though the timing is far advanced. It hestitates during initial crank and continues for a little while and then it will catch and run fine. It acts like the timing that we used to super advance timing in our street hot rods with heavy cams and compression attributes. Help.
That sounds very plausible except for one thing. Dosen't vapor lock just preclude the starting and does not affect the advanced timing indicator symptom?
Midnight Tech,
That sounds very close to what may be happening. It is much easier to change the starter that the Fuel Pressure Sensor under the intake manifold. I think I may try that remedy first.
That would be a plausible symptom if an advance timing problem would not be part of the problem because the advance timing would also show an increase in amp draw during the initial stages of the starting problem I am having.
Check it with a high end scan tool that reports the timing or 98 should still have a distributor use a timing light while cranking but sound alone is a poor indicator.
You all were a great help. I changed the starter and it fixed my problem.
Earl
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