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Truck dies when coming to a stop, parking, or moving slow

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Truck dies when coming to a stop, parking, or moving slow

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Old 08-09-2018, 11:51 PM
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That is strange. Is it surging or just drops low and stays there? Maybe it's a vacuum leak somewhere. Might be time to break out the propane or smoke.
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Old 08-10-2018, 12:03 AM
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It surges every now and then on a rare occasion, i have sprayed brake cleaner everywhere and dont see any vacuum leaks, but i dont have access to propane or a smoke tester
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Old 08-10-2018, 01:39 AM
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Did you check the new cats thoroughly ? May have a got a bad one out of the box...it happens. Which did you go with ? Regardless, need to do a good visual inspection before installing.
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Old 08-10-2018, 05:59 AM
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Originally Posted by Jbrew View Post
Did you check the new cats thoroughly ? May have a got a bad one out of the box...it happens. Which did you go with ? Regardless, need to do a good visual inspection before installing.
bought 2 of the "#94006"
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Old 08-10-2018, 06:41 AM
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Originally Posted by 10thGenFnatic View Post
bought 2 of the "#94006"
Is that a magnaflow part number? You had them welded in? All 02s are in place as well? Brake cleaner can kill old rubber hoses so be careful with that under the hood.
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Old 08-10-2018, 06:42 AM
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Is there any way you can get a video of the problem on YouTube and post the link here?
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Old 08-10-2018, 08:15 AM
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Ill try to tonight, this morning i came to a stop to turn, and it dropped to like 250 rpms, power steering got hard, when i turn at low idle it gets even worse, and yeah both o2s are in place, they are new o2s as well motorcraft
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Old 08-10-2018, 09:07 AM
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Originally Posted by 10thGenFnatic View Post
Ill try to tonight, this morning i came to a stop to turn, and it dropped to like 250 rpms, power steering got hard, when i turn at low idle it gets even worse, and yeah both o2s are in place, they are new o2s as well motorcraft
Sounds like a plan. Does it die when you are going straight and stopping or more so when you are turning? The power steering pump or steering components could be dragging and causing this.

btw these are my fuel trims at idle after warm up.


I have an exhaust leak on bank 1 so thats why mine is off a little bit.
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Old 08-10-2018, 10:37 AM
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Originally Posted by jprevat View Post
Sounds like a plan. Does it die when you are going straight and stopping or more so when you are turning? The power steering pump or steering components could be dragging and causing this.

btw these are my fuel trims at idle after warm up.


I have an exhaust leak on bank 1 so thats why mine is off a little bit.
Are your fuel trims a solid constant number, mine fluctuate from like -8 to +8 like crazy
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Old 08-10-2018, 10:51 AM
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The short term trims can do that and it's fine but your long terms absolutely shouldn't. If you look at the picture I put up you can see a little red marker above the white bar and a yellow one at or below it. That's how far my long term fuel trim fluctuates.

I only use my long term fuel trim to diagnose my problems.

Last edited by jprevat; 08-10-2018 at 10:53 AM.
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