mysterious stall when starting, gmc yukon

Weston · 08-12-2005, 04:01

gmc yukon 2004. runs perfectly fine but about every other week it starts doing this mysterious start-stall routine. you start the engine, normaly one touch, and then it immediatley stalls. if you turn off the egnition completely, wait a few seconds, and try again it starts right up. it will continue to have this problem for a anywhere frojm five to ten of the next starts, then the problem goes away for another week or so. been doing this since we got it. have taken it back to the dealer at least five times and they cannot seem to figure it out. out of desperation i talked to a radio talk show guy about this and he never heard of this issue, and suggested it might be an up-date in the software but the gmc dealership didn't know of any up-dates.

anyone know anything about this kind of problem with a gmc yukon.?

knightkrawler00 · 08-12-2005, 13:29

There are no bulletins relating directly to this problem, but I have seen some weird problems caused by the ignition 1 relay. If the relay is causing a voltage drop, certain modules will not "wake up" at the same time and may cause the vehicle to do all kinds of things. You could try swapping the ignition 1 relay with your DRL relay, they are both located in the underhood fuse block, and see if the problem goes away. Then replace the relay, or have the dealer do it if its under warranty. Another possibility is the ignition switch itself. It may be really sensitive at times and the key is turning back far enough to kill the engine.

I would suspect the relay, since turning the key back seems to help the problem. The modules are not having enough time to "go to sleep" and the other modules will now have the chance to "wake up" and work correctly. Hope this helps.

Weston · 08-12-2005, 16:33

Quote:

Originally posted by knightkrawler00
There are no bulletins relating directly to this problem, but I have seen some weird problems caused by the ignition 1 relay. If the relay is causing a voltage drop, certain modules will not "wake up" at the same time and may cause the vehicle to do all kinds of things. You could try swapping the ignition 1 relay with your DRL relay, they are both located in the underhood fuse block, and see if the problem goes away. Then replace the relay, or have the dealer do it if its under warranty. Another possibility is the ignition switch itself. It may be really sensitive at times and the key is turning back far enough to kill the engine.

I would suspect the relay, since turning the key back seems to help the problem. The modules are not having enough time to "go to sleep" and the other modules will now have the chance to "wake up" and work correctly. Hope this helps.

not only does this help, its a darn smart answer. thanks!

knightkrawler00 · 08-17-2005, 13:32

Just wondering if you have had any luck with the Yukon.

Weston · 08-18-2005, 03:23

taking it in next week. will advise.