2012 F150 5.0 crew 4x4 low speed surging
10-18-2012, 10:43 AM
#12
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Maybe not quite that bad, but it's enough to be annoyed at. Goes away the second you let off the throttle.
Could be possible, but I'm not totally convinced. It doesn't do it in the mornings. Only after I've driven the truck then let it sit for a spell. The cats should be warm enough at that point. My dealer is two blocks from my work, so it isn't that big of a deal to let them have a look. Besides, I want to point out a few other things.
Could be possible, but I'm not totally convinced. It doesn't do it in the mornings. Only after I've driven the truck then let it sit for a spell. The cats should be warm enough at that point. My dealer is two blocks from my work, so it isn't that big of a deal to let them have a look. Besides, I want to point out a few other things.
10-18-2012, 10:56 PM
#14
FX2 SuperCrew
My FX2 on 18's does it too for the first minute or so with light throttle on warm start. It acts like I'm tapping on the throttle about 3 or 4 times per second when I'm holding it steady, smooth if I let off and jumpy again if I lightly reapply the throttle, gone if I tromp on it.
Last edited by FiveL; 10-19-2012 at 05:57 PM. Reason: fix a typo
10-18-2012, 11:41 PM
#15
12-18-2012, 09:01 PM
#17
Senior Member
I have read on a different forum that people have discovered that the initial timing is -9degrees instead of being +10 or so. This has been done by ford to enable the cats to hear up sooner for emission reasons. This also explains why it goes away almost instantly if you punch it while it is stuttering.
Mine does it too but after reading this I have accepted it as normal rather than spend costly hours at the dealer to tell me the same thing, that is if they ever figure it out on there own.
Mine does it too but after reading this I have accepted it as normal rather than spend costly hours at the dealer to tell me the same thing, that is if they ever figure it out on there own.
12-19-2012, 09:21 AM
#18
Member
I know it's going to happen so it isn't unexpected, I know what causes the bucking, and I know it isn't doing any damage to my truck. It also goes away almost instantly and can be negated with my right foot if I want. Sooo I'm not really worried about it.
12-19-2012, 09:43 AM
#19
Senior Member
Mine does this also, only on semi-cold startups were its been sitting for 30minutes - 2 hours. Never had it happen on COLD startup. I've noticed that if I wait 30 seconds or so after starting it and let the Idle settle down it won't do it. I want to bring it up with the dealer BUT it's a 1 in 10 thing for me and very hard to replicate. Any of you guys gotten a tuner? Did it get rid of this issue (if it IS a cool start timing issue)?
12-19-2012, 05:34 PM
#20
Senior Member
Mine does this also, only on semi-cold startups were its been sitting for 30minutes - 2 hours. Never had it happen on COLD startup. I've noticed that if I wait 30 seconds or so after starting it and let the Idle settle down it won't do it. I want to bring it up with the dealer BUT it's a 1 in 10 thing for me and very hard to replicate. Any of you guys gotten a tuner? Did it get rid of this issue (if it IS a cool start timing issue)?