Why does my truck try to turn over, with no start the first crank (it tries) but starts on the second crank.
Hello, hope you’re doing well.
I have a 2002 gmc Sierra 1500HD. It has approx 178000 miles on it. Recently I’ve been having a problem where my truck attempts to crank over the first time, but then once given a little time I turn the key back wait a minute and then starts right up. I immediately went to thinking it was a fuel issue, I replaced the fuel pressure regulator along with the fuel filter. I then see videos on the security features in GMC/Chevy with the key lock feature (the wiring that is directly above the ignition cylinder) If I remember correctly in which I replaced. I’m having trouble diagnosing the problem, because my grounds test good along with my battery cables. The fuel pump seems to work fine, it’s been on going for about a month and I figured if it were the fuel pump it would have went out by now. I also want to add I have had a couple codes that have stayed on my trucks computer after having them replaced twice, once by myself and another by a certified mechanic.I’m curious if that’s another symptom relating with the cranking of a bad ECM? The code is knock sensor (low voltage) 2 codes I believe the codes are related to P0327. Thank you for your time!
The fuel pump seems to work fine
The only way to tell for sure is to test it. I hope the fuel filter, air filter, and spark plugs are not 21 years old!
Would you recommend dropping the tank or tilting the bed? I have a short bed, but the truck is lifted. I haven’t changed a fuel pump in a truck before but I have watched videos on both.
I'd test it first before going through all the work of dropping the tank.
While searching I found the exact same problem for a different vehicle:
https://www.cherokeeforum.com/f2/wont-start-first-attempt-crank-then-starts-2nd-try-144022/
It addresses something I was thinking of, fuel pressure dropping off while the truck is parked. However you said you did replace the fuel pressure regulator, which on most vehicles is what holds that pressure. Might be different for yours, I'm not familiar with it. May be worth checking to see if you have residual fuel pressure before cranking.