2002 gmc sierra 2500 6.0L V8
240,000 km
Been having this problem where whenever I pull to a red light or idling the truck stutters, rpm trickles and truck shuts off with the battery sign showing. This happens especially in the morning when its cold. Only way to avoid this is I put truck in neutral and add gas. I wonder if its something with the ignition. Any help would be great.
What engine? How many miles? Have you scanned for codes and live data? Checked operation of the IAC valve? Checked fuel pressure?
@chucktobias its the 6l engine. About 240000 kms . Have used a obd scanner but no codes came up. tried changing Idle control valve. Problem was still there. I wonder if its the ignition switch.
Sounds like a vacuum leak. Search Scotty's youtube channel for how to find vacuum leaks.
Have used a obd scanner but no codes came up.
What about the data?
tried changing Idle control valve.
Did you install an OEM part?
You really need to tell us all of the diagnostic steps that have been taken so far.
I wonder if its the ignition switch.
That really does not fit the symptoms that you are experiencing. If the ignition switch was cutting off the ignition then putting the trans in neutral and giving the engine gas would not prevent it from stalling.
Have you checked fuel pressure? Checked spark plugs? Checked for vacuum leaks? Tested the MAF sensor? Cleaned the MAF sensor and throttle body? There's a whole litany of things that could be wrong, but we don't necessarily know what you have done so far in trying to find the source of the problem.
@chucktobias yes the valve was oem. A new maf was installed as well new fuel filter. truck is now in the shop. They will be checking all of those things. Thank you for your input.
Shop did a smoke test to check for vacuum leaks. It passed. Passed fuel pressure test. Cleaned throttle body changed sparked plugs. Drove truck home, nonproblems. Hoping the issue doesnt come back in the morning.
p0300.random cyclinder misfire. It was cleared by the shop but has since came back. Is this a big problem.
Check out the FAQ - https://carkiller.com/scottykilmer/howto/misfire-4/#post-53677
Truck has a code p0300.random cyclinder misfire. It was cleared by the shop but has since came back. Is this a big problem.
Yes.
Truck has a code p0300.random cyclinder misfire. It was cleared by the shop but has since came back. Is this a big problem.