turbov6joe

Seems my 2003 HO 6 speed has some kind of throttle problem when I first take off from a light or whatever. The motor seems to rev to a higher RPM level on its own, even if I'm holding the pedal in a fixed position, thus causing the truck to lunge forward. I also noticed that it does this if I'm stuck in traffic in second gear just putt'n along, it wants to over rev and take off even though the throttle is at a lower position....any ideas of what this might be? I remember reading a thread about them doing this when the CC has been on for a while, but never at slow speeds like this rig. I absolutely hate the idea of having to take it in to the dealer, but it's looking like this might be something over my head???
BTW, this problem happened before and after the Edge box, no difference.

bulabula

I've noticed it, but it hasn't been a problem. I thought it was an after effect due to the ECM's low speed govenor taking over when it sensed that the engine may be stalled out.

Yeah, it can be a little disconcerting, especially when I thought I was going to start pushing a 14 car stack in front of me when the engine decided it had enough of me riding the brake in rush hour traffic and revved up.

I guess this is a 6-shooter only thing?

How do you like the Box?

Hoss

I don't think it's a problem. I think it's what he said....and that's what it's supposed to do. It's also the reason I can back a trailer up a hill without applying any pressure to the gas pedal. Your truck is just too smart. My only advice if you're dealing with it in traffic would be to go down a gear.

03quadduallyho

I know what you are talking about, but what is doing it is at lower temperatures the engine idles up to stay warm, if you are in stop and go traffic it will idle up to 1000 or even 1200 rpms if it is getting cold. Maybe put a winterizing cover on the rad to warm it up. I think this one will have to go to dodge though.

Monte

Hoss

Ummm....no offense....but I don't think so. Pretty sure it's the "anti-stall" feature kicking in to keep the engine from stalling like was said above. The cold weather feature you're talking about disengages once the brake pedal is pushed or the truck is put in gear. Besides that, I think it's nearly impossible to make that feature work. Several different criteria have to be met before it will engage.

turbov6joe

This rig does this hot or cold and I'm of the opinion it has nothing to do with anykind of an idle up feature to prevent stalling....this happens at 2500+ rpm. Can you imagine what it looks like when it revs up a bunch at that rpm!
So far the Edge box is kick butt! Perfect amount of power for reliability and good MPG as well.

Mexstan

Never noticed this problem. The only thing I have noticed, and it is not a problem, is that if I accelerate hard thru the gears that when I take my foot of the accelerator and then push the clutch in that the engine revs briefly before slowing down. No, it is not bad co-ordination on my part because I checked that my foot was compleately off the accelerator before pushing in the clutch. Seem to remember a thread on this in the past.

bulabula

Yeah, this isn't a cold weather fast-idle thing, and its done it since new (last October). And I've never had an issue with the cruise control "sticking" either. Had the CO2 reflash accomplished a couple of weeks ago and it still likes to lunge out of the blocks at stoplights sometimes. This isn't a truck to be tail-gating in. Pushing in the clutch helps.

Its not a problem in my book and I'm not worried about it. I do give folks a heads-up about it if I'm going to let them take it for a spin.

bulabula

[quote author=Mexstan link=board=20;threadid=19942;start=0#msg187595 date=1064237975]
Never noticed this problem. The only thing I have noticed, and it is not a problem, is that if I accelerate hard thru the gears that when I take my foot of the accelerator and then push the clutch in that the engine revs briefly before slowing down. No, it is not bad co-ordination on my part because I checked that my foot was compleately off the accelerator before pushing in the clutch. Seem to remember a thread on this in the past.[/quote]I've noticed that too; and like you, don't consider it to be an issue either. My 5.0 'Stang has done that for years.

JKE

My truck does this just off idle - anti-stall.

Only time it does it. Put it in first and let the clutch out without touching the gas and you will get it, second also....I think normal. and it does make it easy to back it in up hill.

Hoss

It will actually do that through all of the gears, but this gentleman is saying that it's doing it above 2500 RPM's....which would not be the anti-stall feature. Something else...

JKE

Yeah I know, and that sounds like a problem if it is that high.

son't think I would try it over 2nd probably roast the clutch...but I believe you ;D

bulabula

Well, the initial post was about off-idle acceleration from a stop light, then it migrated to a 2500+ rpm condition.

Quite frankly, mine rarely ever sees 2500+ rpm so I can't be of much help there, letting alone dropping the hammer at a stoplight at 2500+. But when mine does see 2500+, my foot is in it pretty good. And by that time, she's wound out pretty tight anyways - eg not much "lunge" left in her. Can't say I've noticed that behavour.

TurboJoe, Im curious, has your truck had the cruise control reflash done? I thought that was the behavour exhibited that instigated the safety recall.

This may warrant a dealer visit. Let me know if they have an issue with the Box.

spots

Well I know that mine also does this. Second to third shift at 2100 rpm or so it will take off by itself sorta. Feels like first time driving this truck and too stupid to know when to shift it. I am used to it and will have it looked at one day but too busy right now. I was wondering if it was exhaust lag of some sort? Only does it 2 to 3 shift (I start off in 2nd from lights etc) I also get the hang up on shifts like Mexstan had mentioned. Had the CO2 recall done. My throttle was sticking after using the cruise.

turbov6joe

I guess I was a bit confusing describing my rig's problem. The "auto pilot" feature my truck has takes place from idle up to ~ 2500 rpm then it seems to back off and allow me to have 100% control my MY truck! This lunge is enough that if I pull too close to another vehicle, I could quite possibly push their bumper up to motor This "auto pilot" feature does not take place all of the time, just the worst times it could rear its ugly head (Mr. Murphey rides with me most of the time.)
I have not had it in yet for the cruise recall so I'm banking this is a direct result of the reason for the recall... wishfull thinking on my part. I hate to yank the Edge off then hear about the BHAF not being as good at filtering as the stock airchoke....I mean airbox. One thing for sure, I need to take the Wix oil filter off and put on a Cummins "approved" filter before it goes in. I also want them to listen to the motor, seems that some kind of a new knock has surfaced causing me some question as to the integrity of the motor internals. I know it's a diesel, but this knock is something completely new and does not sound anything like what the motor sounded like for the last 15k miles. Almost sounds like the 2001 I traded in to get this rig. Makes me wonder if the squirters are not clogged or something thus causing the sound???