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#4516852 - 09/15/17 08:45 AM Take foot off gas... car won't stop
wallyuwl Offline


Registered: 06/02/09
Posts: 1776
Loc: 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?

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#4516864 - 09/15/17 08:54 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
Miller88 Offline


Registered: 04/09/08
Posts: 12698
Loc: Onondaga County
Different vehicles, but I have had 2 vehicles that have done this from the factory.
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#4516867 - 09/15/17 08:56 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
Eddie Offline


Registered: 12/07/03
Posts: 9558
Loc: 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
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#4516872 - 09/15/17 08:59 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
JohnnyJohnson Online   content


Registered: 10/22/09
Posts: 2730
Loc: Wet side WA
Thank the EPA.
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#4516876 - 09/15/17 09:06 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
stockrex Offline


Registered: 01/08/06
Posts: 2434
Loc: 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


Edited by stockrex (09/15/17 09:07 AM)
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#4516894 - 09/15/17 09:33 AM Re: Take foot off gas... car won't stop [Re: Eddie]
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: 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.
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#4516897 - 09/15/17 09:35 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: 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.
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#4516901 - 09/15/17 09:43 AM Re: Take foot off gas... car won't stop [Re: stockrex]
boom10ful Offline


Registered: 01/17/17
Posts: 128
Loc: 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.

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#4516909 - 09/15/17 09:53 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
dishdude Offline


Registered: 11/14/08
Posts: 8727
Loc: 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.
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#4516936 - 09/15/17 10:32 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
bdcardinal Offline


Registered: 06/03/05
Posts: 10976
Loc: Santa Barbara, CA
My manual cars have always slowed on their own when I let off the throttle and keep the clutch engaged.
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#4516939 - 09/15/17 10:37 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
Also check the cruise control function.

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#4516947 - 09/15/17 10:42 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
Wolf359 Offline


Registered: 04/27/12
Posts: 4739
Loc: 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.

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#4516978 - 09/15/17 11:09 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
Nick1994 Offline


Registered: 02/19/13
Posts: 10097
Loc: Phoenix, AZ
My grandparents have an 02' Trailblazer (same as an Envoy) and it doesn't do this.
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#4516987 - 09/15/17 11:19 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
MinamiKotaro Offline


Registered: 08/01/12
Posts: 1307
Loc: 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.
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#4516989 - 09/15/17 11:20 AM Re: Take foot off gas... car won't stop [Re: wallyuwl]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11963
Loc: 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.
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