Hey guys my truck is having a crank but no start situation tonight. The truck fires right up when it is cold. When it is warm it will crank longer and just tonight not start. Tried to prime the system, bleed out. tried to prime while cranking. I just noticed the last time that the tach is pegged on "0" could thhis be a timing pick up sensor? It only does it when warm, cold starts are perfect 25* F today. Please toss out any ideas.

P.S. will a after market lift pump make quicker starts, since there it fuel pressure at the pump? thanks guys:help:

Had the same hard to start problem when warm, it's at the dealers getting new injectors.

i found that it does not move untill the truck is running, it still cranks longer when warm then when cold, It doesn ot even try to start, should i take it to GM to check on the injectors? thanks guys

to gm it goes, sounds like its fubar

well i can officially join the club, it is at the dealer getting the full treatment, all 8 not codes, no excessive smoke, just hard starting when warm