low speed surge
#1
low speed surge
I've had a problem with my truck since new. When I drive about a mile, shut
it off for a few mins, then restart it and try to drive at a slow constant
parking lot speed it surges. I had the computer reflashed once and it went
away for a couple months, but returned. I took it to the dealer and in 3
days they were unable to duplicate it. It only happens when it's partially
warmed up and only if it's turned off, then restarted. I can easily drive
around it by letting off the gas, then gently accelerating again but it
does irritate me. Apparently no one else has experienced this that I can
see. Has anyone else experienced this? I have a 2004 Scab Lariat with
24000 miles.
it off for a few mins, then restart it and try to drive at a slow constant
parking lot speed it surges. I had the computer reflashed once and it went
away for a couple months, but returned. I took it to the dealer and in 3
days they were unable to duplicate it. It only happens when it's partially
warmed up and only if it's turned off, then restarted. I can easily drive
around it by letting off the gas, then gently accelerating again but it
does irritate me. Apparently no one else has experienced this that I can
see. Has anyone else experienced this? I have a 2004 Scab Lariat with
24000 miles.
#3
Yes, I have the exact same issue. Reflash helped then it returned at a later date. I have just lived with it. If I accelerate slightly, it will smooth out. But, it only does it occasionally and I have a hard time duplicating it myself. Mine is out of warranty now.
Last edited by FS-150; 03-23-2007 at 06:28 PM.
#5
Originally Posted by VFR_Man
When was it last reflashed? Maybe they have a better program if it's been awhile.
a couple of months ago the service guy said it had the latest update and
that they wouldn't reflash it if it has the latest update. I guess I'm not the
only one with this little glitch. It goes away in 30 seconds or so but it did
do it when I was driving about 20 mph leaving the base the other day.
Thanks for the response.
#6
I have an 04 5.4 FX4 & I've had the same since new. I had the Ford program reflashed soon after getting the truck for other issues but no difference. I've run the superchips tune for 2 years - still happens... as you say, not easy to replicate... you just have to catch the right speed and then it oscillates up and down until you stop or accelerate.
Now 07 arriving in April - interesting to see if the quirk is still there.
Now 07 arriving in April - interesting to see if the quirk is still there.
#7
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#8
mine only does it while in reverse. I just thought it was in my head, but I guess not. like everyone seems to point out, it only seems to do it while semi-warmed up. the motor will idle fine, then bog and suddenly spin up 100 rpm or so. very weird
at least it isn't doing what my old Taurus used to do. while idling through parking lots the car would goose the throttle enough to get a 1st to 2nd shift. scared the heck out of me a few times.
at least it isn't doing what my old Taurus used to do. while idling through parking lots the car would goose the throttle enough to get a 1st to 2nd shift. scared the heck out of me a few times.
#9
I had the same problem trying to drive out of a parking lots after going shopping. The only permanent solution I have found to date is to ditch the factory programming and install aftermarket tunes. The factory runs these engines too lean and that is why your getting the low speed surge, the engine is choking out, and then trying to catch up again. Just beware that if the dealer catches you with the aftermarket programming, they can decline your warranty.
#10
Originally Posted by ford9c
I had the same problem trying to drive out of a parking lots after going shopping. The only permanent solution I have found to date is to ditch the factory programming and install aftermarket tunes. The factory runs these engines too lean and that is why your getting the low speed surge, the engine is choking out, and then trying to catch up again. Just beware that if the dealer catches you with the aftermarket programming, they can decline your warranty.
about it. So I take it one of these Edge programmers would eliminate this?
I'm a little hesitant to mess with anything because other than this little
issue the truck runs great and is giving me mileage in the 17 mpg range.
#11
Originally Posted by ford9c
I had the same problem trying to drive out of a parking lots after going shopping. The only permanent solution I have found to date is to ditch the factory programming and install aftermarket tunes. The factory runs these engines too lean and that is why your getting the low speed surge, the engine is choking out, and then trying to catch up again. Just beware that if the dealer catches you with the aftermarket programming, they can decline your warranty.
#13
#14
I'm using the Diablo Sport Predator only because it was the recommended tuner when I bought my truck, before the Edge got all the press. I have had good luck with it so far but I also run it on the mid range , 91 octane setting. In addition, I've gone through and very slightly even tweaked those settings to what feels best for me from the drivers seat.
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