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Take foot off gas... car won't stop #4516852
09/15/17 07:45 AM
09/15/17 07:45 AM
Joined: Jun 2009
Posts: 1,824
Wisconsin
wallyuwl Offline OP
wallyuwl  Offline OP
Joined: Jun 2009
Posts: 1,824
Wisconsin
When I take my foot off the gas, the vehicle will slow down about 5 mph and then keep going at that speed even with my foot off the gas. In town I typically go about 30 mph on the roads here. If I take my foot off the gas, it slows down to 25 and will keep going that speed until I brake. This morning I was going 25, took my foot off the gas and it (slowly) slowed down to 20 and stuck there.

Vehicle is a 2003 GMC Envoy with the 4.2, 108k miles. Has a lot of new parts and fluids, and I cleaned the throttle body and put in new plugs a month ago. I had a shop put in a new valve cover gasket at the same time (maybe there is a leak there?). This is something I just noticed, but it might have been doing it since I've owned it without me noticing (bought it at the end of July). I don't go on the hwy much, but last time I did the vehicle slowed down while coasting from hwy speeds to the point where I'd normally brake (around 40 mph).

To keep going a given speed it needs air and fuel. Any ideas?

Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516864
09/15/17 07:54 AM
09/15/17 07:54 AM
Joined: Apr 2008
Posts: 12,982
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,982
Onondaga County
Different vehicles, but I have had 2 vehicles that have done this from the factory.


18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M
Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516867
09/15/17 07:56 AM
09/15/17 07:56 AM
Joined: Dec 2003
Posts: 9,926
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,926
Florida, Cape Coral
Just a guess but, some engines have a "little shock absorber so the engine will not return to idle speed too fast (emissions). That absorber may be hanging up. I'd locate it and try to see if it is the cause. Ed


CX5 Touring 2.5L :-)
Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516872
09/15/17 07:59 AM
09/15/17 07:59 AM
Joined: Oct 2009
Posts: 3,515
Wet side WA
JohnnyJohnson Online content
JohnnyJohnson  Online Content
Joined: Oct 2009
Posts: 3,515
Wet side WA
Thank the EPA.


2004 Corolla 126813
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74478
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516876
09/15/17 08:06 AM
09/15/17 08:06 AM
Joined: Jan 2006
Posts: 2,453
Michigan
stockrex Offline
stockrex  Offline
Joined: Jan 2006
Posts: 2,453
Michigan
lube throttle cable/body,
I had one that would stick, try it with the vehicle turn off have someone push gas pedal and check if throttle goes back to resting position when foot is off it.
check idle speed in neutral/park
push gas pedal and let go and recheck idle speed

your cold start high idle thing may be faulty - not sure of technical term

Last edited by stockrex; 09/15/17 08:07 AM.

Ridgeline, Dmax, Ford 3.5
Oil Whisperer!*Fear the DINO*
Re: Take foot off gas... car won't stop [Re: Eddie] #4516894
09/15/17 08:33 AM
09/15/17 08:33 AM
Joined: Aug 2015
Posts: 2,918
NC
BigD1 Offline
BigD1  Offline
Joined: Aug 2015
Posts: 2,918
NC
Originally Posted By: Eddie
Just a guess but, some engines have a "little shock absorber so the engine will not return to idle speed too fast (emissions). That absorber may be hanging up. I'd locate it and try to see if it is the cause. Ed


Are you talking about a dash pot?

If it does have a dash pot, give it some silicone spray.


1992 Toyota Pickup--Harvest King Premium 10W-30--Fram PH3614
Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516897
09/15/17 08:35 AM
09/15/17 08:35 AM
Joined: Aug 2015
Posts: 2,918
NC
BigD1 Offline
BigD1  Offline
Joined: Aug 2015
Posts: 2,918
NC
Could be the throttle blade sticking in the bore. Might need to take the throttle body completely off, and give it a good soaking.


1992 Toyota Pickup--Harvest King Premium 10W-30--Fram PH3614
Re: Take foot off gas... car won't stop [Re: stockrex] #4516901
09/15/17 08:43 AM
09/15/17 08:43 AM
Joined: Jan 2017
Posts: 145
California
boom10ful Offline
boom10ful  Offline
Joined: Jan 2017
Posts: 145
California
Originally Posted By: stockrex
lube throttle cable/body,
I had one that would stick, try it with the vehicle turn off have someone push gas pedal and check if throttle goes back to resting position when foot is off it.
check idle speed in neutral/park
push gas pedal and let go and recheck idle speed

your cold start high idle thing may be faulty - not sure of technical term


Cold start high idle could be idle air control valve; usually will be accompanied by oscillating revs though.

Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516909
09/15/17 08:53 AM
09/15/17 08:53 AM
Joined: Nov 2008
Posts: 9,288
Phoenix
dishdude Offline
dishdude  Offline
Joined: Nov 2008
Posts: 9,288
Phoenix
I don't think OP is complaining of a high idle, just that the vehicle doesn't continue to slow down on it's own. My experience is most modern vehicles will coast in drive for a long time at a decent speed without any throttle input.

The days of the 3 speed auto that you had to constantly give throttle to maintain momentum are gone.


2018 Challenger SRT 392 PUP 0w-40 Wix 57899XP
2018 GTI
Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516936
09/15/17 09:32 AM
09/15/17 09:32 AM
Joined: Jun 2005
Posts: 11,616
Santa Barbara, CA
bdcardinal Online content
bdcardinal  Online Content
Joined: Jun 2005
Posts: 11,616
Santa Barbara, CA
My manual cars have always slowed on their own when I let off the throttle and keep the clutch engaged.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516939
09/15/17 09:37 AM
09/15/17 09:37 AM
Joined: Aug 2011
Posts: 9,560
Boston, MA
HerrStig Offline
HerrStig  Offline
Joined: Aug 2011
Posts: 9,560
Boston, MA
Also check the cruise control function.

Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516947
09/15/17 09:42 AM
09/15/17 09:42 AM
Joined: Apr 2012
Posts: 5,584
MA
Wolf359 Online content
Wolf359  Online Content
Joined: Apr 2012
Posts: 5,584
MA
Yeah, be happy that it does that. Not sure why you're driving that slow anyway. Manufacturers do all they can to reduce friction to improve gas mileage. You don't need much power to maintain speed. It's usually a double of speed requires a square of the power or something to that effect, so going 100mph requires a lot more power than just 30 or 40.

Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516978
09/15/17 10:09 AM
09/15/17 10:09 AM
Joined: Feb 2013
Posts: 11,088
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,088
Phoenix, AZ
My grandparents have an 02' Trailblazer (same as an Envoy) and it doesn't do this.


2015 Hyundai Sonata 2.4L 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516987
09/15/17 10:19 AM
09/15/17 10:19 AM
Joined: Aug 2012
Posts: 1,307
TN
MinamiKotaro Offline
MinamiKotaro  Offline
Joined: Aug 2012
Posts: 1,307
TN
Electric throttle? It will stay partially open until you hit the brake or coast below some pre-set speed. Something to do with economy and emissions.


1967 VW Beetle: Delo 15w40/ST4386
2004 Saturn Ion: Magnatec 5w30/DW5436
2014 Polaris Ranger 570: Delo 5-40/Wix 51356
Re: Take foot off gas... car won't stop [Re: wallyuwl] #4516989
09/15/17 10:20 AM
09/15/17 10:20 AM
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
Pop it into N(eutral) and see if engine revs up past say 1500-1700.

I think something got almost MOOBAR at your last service. Look for air leaks in the complete intake stream, PCV circuit, look for tears or breaks the intake boot past the metering ( if any). I had a 91 Mazda 626 split an intake pipe in the winter and you didn't see the crack unless you REMOVED the pipe ( rubber accordion hose) and bent it backward a tad. Engine torqueing exercised that pipe a lot.


2014 Nissan Rogue S CVT, OC#10 47272mi-QSUD10W30+5w20 Toughguard Filter; '17 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
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