just replaced battery, starter, fuel filter, fuel pump relay. still wont start. will almost start ,but doesnt.Also, starter makes a real nasty sound every cpl of turns

Asked by Jan 28, 2016 at 07:45 AM about the 2000 GMC Yukon Denali 4WD

Question type: Maintenance & Repair

ok, starter got screwed trying to start motor for a cpl days. got new starter, new battery, fuel pump relay. still no start. aparently it was hardstarting before but always started. It seems like it wants to start,a little stumble every once in a while. Fuel pump can be herd. Starter fluid had no response whatsoever.has spark.starter makes ugly sound every cpl of turns, when it almost starts.Also, electrical is doing wierd things, and tranny pops out of gear occasionaly, hard to get reverse. W.T.F.?? The most important  issue is , wont start. messing up other parts trying. HELP, thanx

2 Answers

83,045

If you got no response with starter fluid then you do not have spark at the plugs, if you have ground on it long enough that you fried a starter that it is possible that the cylinder walls have been washed by too much fuel also. So verify that you have good spark at the plugs, it should be a bright blue arch on the spark plugs, if not check the coil output, it should be able to throw an arch at least 1 inch and still be a bright blue in color if not replace the coil, if it is then replace the cap, rotor, plug wires, before replacing the plugs I would squirt a little oil into each cylinder then install new plugs, if it doesn't fire in 10 seconds it is not going to and further diagnostics need to be done, i.e. Fuel pressure and flow, exhaust system back pressures, full live data scan.

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thanks. i will check it out

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