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GMC Forum: 2003 Yukon engine idles too low and dies
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  #1  
Old 07-09-2011, 08:51 PM
Monsolo Monsolo is offline
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Default 2003 Yukon engine idles too low and dies

Had no problems except for the engine running a bit rough on my 2003 Yukon XL so I decided to tune her up (123k miles). Bought plugs, wires, PCV valve, air filter, and fuel filter. Changed all but the fuel filter the first day. Took it out and ran her around the neighborhood... holy cow, she was smooth as silk!

Here's where it gets interesting... the second day I de-pressurized the fuel system according to the Haynes manual and got up underneath her to change the fuel filter. Found out that the fuel filter I bought was the wrong kind... wife had to use the Yukon that night so I popped the relay back in, connected the battery, and off the wife went. She calls me later to tell me the Yukon is stalling every time she makes a turn after decelerating. So, the third day I got the right fuel filter, de-pressurized the fuel system again, and changed it. Got into the Yukon and took her around the neighborhood only to have it stall the same way as the day before! Took it to Autozone to have the codes checked but there weren't any. When I decelerate, the engine idles down to around 200rpm and then, when I put an additional load on the engine by turning the wheel, it finally stalls out. It stalls even more frequently, like when I just come to a stop, when I have the climate control system on and the compressor is active.

Any ideas what the heck is going on? I need help please! Thanks!
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Old 07-10-2011, 12:44 AM
Monsolo Monsolo is offline
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Anybody want to take a crack at the problem? I could really use some help!

Thanks!
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Old 07-10-2011, 09:17 AM
Monsolo Monsolo is offline
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By the way, thought I'd add that when you give the engine gas, it goes like a bat out of heck. There's no problem accelerating or, once the idle smooths out, sitting still and idling. It's only during the deceleration that the engine falls to the low rpm and hesitates. Then, if given a little time, it goes right back up to normal idle and everything is fine.

Thought I'd throw that in...
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Old 07-10-2011, 05:10 PM
Monsolo Monsolo is offline
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Well, since nobody wants to comment, I'll keep on plugging away at it. I'm going to try and clean the MAF sensor and see if that's contributing to the low idle. It has been quite a while since the air filter has been replaced and the MAF is right next to the filter... so maybe that's some of the problem. Anybody ever experience a low idle/stall issue and had a dirty MAF sensor?
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Old 07-10-2011, 08:26 PM
happy 2011 happy 2011 is offline
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Well try removing the battery cable or the pcm fuse. This will reset the pcm and quit pos it will fix your problem. If not then you may want to remove and clean your IAC motor (idle air control). Let me know what happens
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Old 07-10-2011, 10:15 PM
Monsolo Monsolo is offline
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Happy, thanks for the response. However, I think my problem is worse than I thought! While driving the Yukon home tonight, it started refusing to shift to third from second. Right before it should shift to third it would shudder a bit and then the engine would race to 4500rpm as there was suddenly no load. Is it possible that a failing transmission could cause an engine to idle erratically and stall? Looks like my problem is not the engine but the transmission... I just don't get how suddenly all this trouble has popped up! I think I'm just going to take her to the dealership and bite the bullet. Can transmission and engine problems be caused by a confused ECM that needs to be reset???
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Old 07-10-2011, 11:52 PM
Monsolo Monsolo is offline
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Update: Just went out and checked the transmission fluid... was a quart and a half low. Still no change in the shifting issue. It's now refusing to shift into third altogether... the engine just revs very high. Bummer...
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Old 07-12-2011, 09:28 AM
Monsolo Monsolo is offline
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Well, getting the transmission rebuilt. Should have it back by Friday. We'll see if the original idling problem goes away...
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Old 07-12-2011, 05:06 PM
happy 2011 happy 2011 is offline
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most likly it will fix your idling problem too. Sounds like the trans was staying in look up and that would stall the motor every time.

good luck
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Old 07-21-2011, 05:23 AM
Monsolo Monsolo is offline
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Ok, everyone, I'm back! Got the tranny rebuilt... she shifts smoothly now! Anyway, still same idle problem... Here's what the tech over at the tranny shop told me... see if any of you guys have heard this: he said that the 2003's (and maybe other years) were notorious for the ECM's "losing" the idle speed settings when the battery was disconnected for a lengthy period of time, usually over an hour or two. Apparently, it can take up to fifty or so restarts during normal driving for the ECM to "re-learn" the correct idle position. He also said the dealership can fix the problem quickly, if I didn't mind paying them an arm and a leg, or I could just let it sort itself out. Now, in his defense, you'll notice in my previous posts that my idle problem didn't show up until after I had left the battery disconnected for about an hour to try to change my fuel pump. So that much rings true... has anyone ever heard of this explanation or is he full of hooey?
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