My 99 c2500 Suburban with the 7.4L L29 engine is having hard starts when the engine is remotely warm. I've had the fuel pump and filter replaced, but it didn't help. Also, when it does finally start, there is a small plume of black smoke from the exhaust. Once running, there are no drivability issues except for a bad shake at 65mph. Any above or below that speed, no shake.
I think the start problem may be the fuel pressure regulator, is there any test that is more specific to the FPR than a normal leak down test?
have the same problem?
Wednesday, April 29th, 2009 AT 9:54 AM