I have a 2003 Yukon XL 1500 with the 5.3 V8. So I pulled my battery out to fix a problem with the windshield wiper fluid container and then reinstalled it. After this the Yukon xl started loping in idle and occasionally die during a turn. I've disconnected the battery before for other stuff and never had a problem. The air filter is good and I replaced the fuel filter. I haven't checked the fuel pump pressure yet, hopefully will get to it tonight and I haven't checked for vacuum leaks either. I'm afraid it's going to be a bad fuel pump. Also I've noticed that the A/C now doesn't work very well unless I'm going over 40mph. Does anyone else have this problem? I almost got rear ended today when it died during a turn.
lopes at idle dies when turning
- Thread starter f16z28
- Start date
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Rivieraracing
Full Access Member
Since you unplugged your battery and it started doing it after plugging it back in, I'd say that you need to do a throttle relearn. I've unplugged my battery tons of times since I've owned it but one of the times it happened to me like you say it happened to you and I had to make my truck relearn. I can't remember the procedure that you have to do since it's been quite a few years since I've had to do it and I'm going out of town in a few, when I get home tomorrow I'll see if I can find the procedure or maybe someone else can chime in with it!
Also, a few other things you can check, do and clean in the mean time! First off, unplug the battery again for at least an hour or so. Might work with the throttle, might not. Also, if you haven't cleaned out your throttle body in a while, go ahead and do it! Mine will kinda act like your saying your truck is doing when it needs cleaning!
Also, a few other things you can check, do and clean in the mean time! First off, unplug the battery again for at least an hour or so. Might work with the throttle, might not. Also, if you haven't cleaned out your throttle body in a while, go ahead and do it! Mine will kinda act like your saying your truck is doing when it needs cleaning!
livingez_123
Full Access Member
I would also like to know the throttle relearn procedure.
I just posted the throttle relearn procedure yesterday. Here's the link.
http://www.tahoeyukonforum.com/forum/showthread.php?t=54605
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http://www.tahoeyukonforum.com/forum/showthread.php?t=54605
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livingez_123
Full Access Member
I tried that...didn't work. I still have a crazy low idle. is fine on a cold start. right at 1000 rpm then it slowly goes down to 500. come to a stop and it drops to 400 and back up to 500. sometimes it goes up and down many times. truck runs great otherwise.
Rivieraracing
Full Access Member
Then I'd be cleaning out your throttle body real good, that's pretty much exactly what our denali does when the throttle body gets dirty!!
---------- Post added at 10:18 AM ---------- Previous post was at 10:12 AM ----------
I've never heard of that one, but gonna have to try it out and see what it does to my ride. The one I was referring to was in my Haynes manual and this exactly what it tells you to do:
"To allow the PCM to relearn these values, start the engine and run it as close to idle speed as possible until it reaches its normal operating temperature, then run it for approximately two minutes at 1200rpm. Next, drive the vehicle as far as necessary - approximately 5 miles of varied driving conditions is usually sufficient - to complete the relearning process."
Give it a try, it worked for the one time out of many when my truck was running like crap after I had unhooked the battery!! And sorry for the late response back on this, had too much to do the last few days and had alot of fun doing it! lol
livingez_123
Full Access Member
I found this....
Procedure 4 Throttle/Idle Learn
Description
The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct
idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle
position. The idle may be unstable or a DTC may set if the throttle position is not learned.
Conditions for Running the Throttle Learn Procedure
• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507
are not set.
• The engine speed is between 450-4,000 RPM.
• The manifold absolute pressure (MAP) is greater than 5 kPa.
• The mass air flow (MAF) is greater than 2 g/s.
• The ignition 1 voltage is greater than 10 volts.
Throttle Learn
Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code
(DTC) List - Vehicle.
1. Start and idle the engine in PARK for 3 minutes.
2. With a scan tool, monitor desired and actual RPM.
3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.
4. Ignition OFF for 60 seconds.
5. Start and idle the engine in PARK for 3 minutes.
6. After the 3 minute run time the engine should be idling normal.
Important: During the drive cycle the check engine light may come on with idle speed
DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.
If the engine idle speed has not been learned the vehicle will need to be driven at
speeds above 70 km/h (44 mph) with several decelerations and extended idles.
7. After the drive cycle, the engine should be idling normally.
If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds
and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs.
---------- Post added at 03:18 PM ---------- Previous post was at 01:37 PM ----------
Well I disconnected the battery, cleaned the TB within an inch of its life. Put it all back together, connected the battery. Then I did the buckle, key on, depress fast and hold, turn off and release. I started it up, and after it cleaned out from all the cleaner it runs real smooth and my idle is so much better. I ran it down the freeway and back and the transmission shifts better also. it will stay in gear without downshifting like a crazy man. come off the freeway and idle is smooth as silk with the a/c on and right about 600-650rpm. So as of now, all is good in the land of oz.
Procedure 4 Throttle/Idle Learn
Description
The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct
idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle
position. The idle may be unstable or a DTC may set if the throttle position is not learned.
Conditions for Running the Throttle Learn Procedure
• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507
are not set.
• The engine speed is between 450-4,000 RPM.
• The manifold absolute pressure (MAP) is greater than 5 kPa.
• The mass air flow (MAF) is greater than 2 g/s.
• The ignition 1 voltage is greater than 10 volts.
Throttle Learn
Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code
(DTC) List - Vehicle.
1. Start and idle the engine in PARK for 3 minutes.
2. With a scan tool, monitor desired and actual RPM.
3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.
4. Ignition OFF for 60 seconds.
5. Start and idle the engine in PARK for 3 minutes.
6. After the 3 minute run time the engine should be idling normal.
Important: During the drive cycle the check engine light may come on with idle speed
DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.
If the engine idle speed has not been learned the vehicle will need to be driven at
speeds above 70 km/h (44 mph) with several decelerations and extended idles.
7. After the drive cycle, the engine should be idling normally.
If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds
and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs.
---------- Post added at 03:18 PM ---------- Previous post was at 01:37 PM ----------
Well I disconnected the battery, cleaned the TB within an inch of its life. Put it all back together, connected the battery. Then I did the buckle, key on, depress fast and hold, turn off and release. I started it up, and after it cleaned out from all the cleaner it runs real smooth and my idle is so much better. I ran it down the freeway and back and the transmission shifts better also. it will stay in gear without downshifting like a crazy man. come off the freeway and idle is smooth as silk with the a/c on and right about 600-650rpm. So as of now, all is good in the land of oz.
Rivieraracing
Full Access Member
I'm curious if it was a dirty throttle body or it needing a throttle relearn, but either way I'm glad you got it fixed!
livingez_123
Full Access Member
I'm sure it was the dirty TB. I'm ashamed that it was that dirty.
Rivieraracing
Full Access Member
Don't feel ashamed, they get pretty crapped up faster than one thinks!! In fact, I'm overdue to clean mine out but it's still drives great so I've been putting it off!
