Last post on Oct 11, 2002 at 7:12 PM
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Ford F-250 Super Duty, Truck
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#719 of 768 Cruise Control Surges
May 15, 2002 (5:30 pm)
Has anyone else noticed this problem of surging cruise when you try to restore original speed. Sometime drops off and the surges up and drops off. May have to take into Ford to find out.
May 16, 2002 (6:52 am)
Sorry no. Mine is very smooth, no surges that I've noticed. Don't use it a lot though but did this past weekend.
Good luck. Please keep us posted as to what you find.
#721 of 768 Frank, I have a PSD and use my cruise
May 16, 2002 (8:14 am)
every chance I get, even down to 30 mph in town. (I finally got old enough, smart enough and tired enough of paying speeding tickets, so now I just set it at the limit and forget about it) One bonus about using it religiously is that I'm now usually a tad slower than most of the traffic, so I have more time to recognize that a problem is developing on the road in front of me...and I get to do more sight-seeing...
Mine does surge a bit, but only at very low speeds, or if I'm driving on very hilly whoop-de-do type roads. In both cases, I suspect it's the turbo kicking in rather than the cruise not controlling well enough; it can only react gradually, whether that means adding more pedal or backing off. On open roads at speeds above about 55, there is no surge whatsoever...it stays absolutely locked in at the setpoint. For hours and hours and hours if I'm on I-5...
Resuming cruise after braking is fine too, it gradually accelerates to the setpoint - unless I'm using it in one of those very slow or very hilly areas I mentioned.
May 16, 2002 (10:52 am)
My cruise is also rock solid. I use mine almost everyday, every chance I get. I have never used it at slower speeds though, so I can't comment on that.
Jack, you mentioned your cruise surges a little at lower speeds. Does your truck do it without the cruise at the same speeds? Mine has a slight surge at "in town" speeds. It is the most noticable in the lower gears crawling along between 1,000-1,500 rpms with a light foot on the throttle. I have been told it is air in the fuel being supplied to the injectors. The factory fittings in the tank and pre-pump lines are letting air in.
May 16, 2002 (11:33 am)
I too have the '01 PSD and at slow speeds, the motor can't seem to decide on what to do. The speed stays constant, but the motor revs up then down, then up then down. Above about 45, it is real steady. If I'm controlling the gas flow, there is no surging unless I create it.
May 16, 2002 (12:00 pm)
Occasionally mine will search in the 40 - 45 range. All depends on conditions. I don't like the tranny searching so if it's excessive, I lock out overdrive until I can either reduce or increase speed out of that range. I could see where tranny searching might drive the cruise nuts.
#725 of 768 Cruise...
May 17, 2002 (8:53 am)
I have the V10 with auto and my cruise also surges...I find that it does this most going down long hills. Took it in to the dealer and of course since there aren't any long hills around the dealer they couldn't replicate it so they couldn't do anything about it...sigh.
May 17, 2002 (10:17 am)
My '01, V10, 3.73 has a surge right around 70 mph with cruise control on. Don't have any problem at lower speeds. It's most noticeable on long flats. I experienced it since truck was about 5-6 months old, but I usually don't cruise more than 65 mph, (above 65 mileage drops big time,) so it hasn't been an issue for me. Totally forgot to mention it during last dealer visit for broken tailgate lock.
I recently went to VA. to bring niece/apt. furniture and unreliable car back home from college, and towed U-Haul car trailer back to CT. VA has higher speed limits than CT. and I got reaquainted with surge on way there. It was windy, and the surge started makin' me nuts. I tried cruise with overdrive on & off but it didn't change it -still had cyclic increase in speed then drop back down, over and over..... Had to disengage cruise and restart it mulitple times. From watching the tach, it seemed that it happens when torque converter locks or unlocks. I didn't want to go any slower (10 hour trip), so I turned the cruise off and finished trip with manual go-pedal instead. Never have noticed surging without cruise on. Forgot about it again 'til I saw this thread.
Strange thing on this trip, engine never surged on return leg towing trailer/car w/ 1/2 ton of stuff in bed, and three passengers. Truck was perfectly happy at 70 mph with a load.
Seems like it's a design feature to me - V10 tellin' us either work me or go faster!
May 17, 2002 (11:51 am)
These trucks are definitely happier when loaded and working for their keep. Mine is soooooo much nicer to drive when towing or loaded.
May 17, 2002 (12:40 pm)
No, the surging only occurs if the cruise is engaged. If I'm on the pedal, it's every bit as steady as my foot. Of course, that does depend on the driving surface...if I'm out in the dirt working my way through ditches or over rocks it can surge some, but that's my fault. Overall, I'd have to say that the cruise is rock solid except under the extremes I mentioned in my last post.
It sounds like you and some of the other folks are seeing their torque converters come out of lockup when they really shouldn't be. Once I get fast enough to be fully into OD (TQ Lockup) it stays locked until I hit the brakes or find a really steep hill to climb. The faster I drive, the less likely it is for the TQ to come out of lockup. At 65 mph, I routinely pull 7% grades in OD with the TQ locked. I'm sure it would pull steeper ones than that and still stay locked, but can't recall the last time I drove over one.