Question about 2003 GMC Yukon XL

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2003 yukon stalls in traffic

My 2003 GMC Yukon XL occasionally stalls in traffic, sometimes even on the interstate. After a few attempts at cranking the engine, it will usually start up again, and run fine for several more minutes, hours, days, or even weeks. These episodes are becoming more frequent (in the past few days), and have even happened while at idle. My guess is that its fuel-system related, but where should I start? I tend to search out the cheapest gasoline prices, and fear that my frugality will prove an expensive mistake. Are their any fuel additives that might be useful at this point? Any other advice or suggestions will be most appreciated.

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Sounds like a spark timing issue. dist/coils or plugs. the only other thing and this is weird-the coolant temp sensor

Posted on Oct 08, 2009

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Are your rpms at idle low? If so, remove and clean your throttle body with throttle body cleaner i.e. Gummout carb and throttle body cleaner. This will return vehicle to original factory rpm levels.

Posted on Oct 12, 2009


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Posted on Jan 02, 2017

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Suddenly stalled in traffic, gas was low but I dont think empty. Added gas would crank but not start. Alternator pulled and tested OK. Still won't statrt seems to not be firing.

spray WD40 into intake, if it acts like it wants to fire, it is a fuel problem, more then likely the fuel pump. Now if it doesn't act like it wants to fire then it is in the ignition senor, distributor. Hope this helped Tim

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Feb 26, 2010 | 2003 GMC Yukon XL

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I have a 2003 Yukon XL 1500 with the 5.3L engine. Twice in the last week when I was on the Interstate and had the cruise control on the vehicle unexpectedly stalled and I had to guide it to the shoulder....

there are a few causes for this to happen
I just put a fuel pump in yesterday in a 04 yokon XL with the same issue
it had a plugged fuel filter, and low fuel pressure.
Same complaint, coming from CA to TX, freeway speed cruise on and it just dies.

The vehilce needs to be looked at, and have vehilce scanned for codes.

I hope this helps.

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