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  #1  
Old 12-03-2010, 07:26 AM
ecogenie ecogenie is offline
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Default Acceleration at Stop?

2000 Ranger 2.5L accelerates with foot off the pedal as coming to a stop. Could this be the O2 sensor or something else? I thought we had it fixed but it started acting up again. It rebs way up high and comes back down by itself. Have to take it out of gear when coming to a stop in fear of it going to hit something. Any help would be greatly appreciated. Thanks!
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  #2  
Old 12-03-2010, 02:55 PM
terryduanemiller terryduanemiller is offline
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Default Re: Acceleration at Stop?

EGR, here's a cheap trick.. it will stop it.

NOTE: take a BB (yes like u shoot in BB gun) pull the EGR vacuum line off, place BB inside and press back onto EGR. BB is to large to fall onto EGR and to large to get sucked into engine. this blocks the EGR.
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  #3  
Old 12-03-2010, 03:03 PM
Fordzilla80 Fordzilla80 is offline
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Default Re: Acceleration at Stop?

I know it sounds really simple, and like it could never be the problem, but i've seen it be the cause many times, including for myself. Drive the truck for the next few days, and brake with your left foot, while taking your right completely off the gas pedal, and put it on the floor. I had a nice little problem myself with having my foot on the edge of the brake and halfway on the gas at stops, which caused the problem you describe. I would have never thought it, but one time when the RPMs rose, I took a look at my foot, and lo and behold, my foot was halfway on the gas. This is by far the easiest test to do, and cheapest. Try this first, but if it does it still, then there's something else wrong.
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  #4  
Old 12-03-2010, 04:10 PM
FireRanger FireRanger is offline
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Default Re: Acceleration at Stop?

Also now would be a good time to remove the IAC and throttle body for cleaning. If something is gumming it up, it can easily cause this.
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  #5  
Old 12-03-2010, 06:18 PM
TheStig TheStig is offline
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Default Re: Acceleration at Stop?

sounds more like the IAC....

take it off and soak it in Seafoam over night then blast it with carb cleaner

get all the carbon out of the valve so it will quite sticking....
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  #6  
Old 12-03-2010, 08:06 PM
fordnut71 fordnut71 is offline
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Default Re: Acceleration at Stop?

id say a vacuum leak. the suggestions your getting is some of the common places. also look at the vacuum hoses for any crack,broken or lose.
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  #7  
Old 12-04-2010, 03:02 AM
ecogenie ecogenie is offline
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Default Re: Acceleration at Stop?

Quote:
Originally Posted by TheStig View Post
sounds more like the IAC....

take it off and soak it in Seafoam over night then blast it with carb cleaner

get all the carbon out of the valve so it will quite sticking....
The IAC is only a year old. I did just a few weeks ago take it off even it not being that old and sprayed it with cleanter. Still no changes in the condition.

----------

Quote:
Originally Posted by fordnut71 View Post
id say a vacuum leak. the suggestions your getting is some of the common places. also look at the vacuum hoses for any crack,broken or lose.
How many hoses are vaccum and where are they located? Is there an easy way to test for leaks? Why would it be worse at a stop and not all of the time?

----------

Quote:
Originally Posted by Fordzilla80 View Post
I know it sounds really simple, and like it could never be the problem, but i've seen it be the cause many times, including for myself. Drive the truck for the next few days, and brake with your left foot, while taking your right completely off the gas pedal, and put it on the floor. I had a nice little problem myself with having my foot on the edge of the brake and halfway on the gas at stops, which caused the problem you describe. I would have never thought it, but one time when the RPMs rose, I took a look at my foot, and lo and behold, my foot was halfway on the gas. This is by far the easiest test to do, and cheapest. Try this first, but if it does it still, then there's something else wrong.
My foot is completely off of the gas petal and brake and out of gear when it is happening.
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  #8  
Old 12-06-2010, 09:02 AM
DeckedOut DeckedOut is offline
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Default Re: Acceleration at Stop?

Quote:
Originally Posted by Fordzilla80 View Post
I know it sounds really simple, and like it could never be the problem, but i've seen it be the cause many times, including for myself. Drive the truck for the next few days, and brake with your left foot, while taking your right completely off the gas pedal, and put it on the floor. I had a nice little problem myself with having my foot on the edge of the brake and halfway on the gas at stops, which caused the problem you describe. I would have never thought it, but one time when the RPMs rose, I took a look at my foot, and lo and behold, my foot was halfway on the gas. This is by far the easiest test to do, and cheapest. Try this first, but if it does it still, then there's something else wrong.
This is a problem for me. Size 13 HD boots are not meant for driving for some reason...
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  #9  
Old 12-08-2010, 03:03 PM
00bamaranger 00bamaranger is offline
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Default Re: Acceleration at Stop?

I've had this problem with mine a few times now. Alot of different things can cause it. The first time it started doing it I replaced the IAC and it fixed it for almost a year. When it started doing it again I took the IAC back because it was still under warranty and it didn't fix it. Then I replaced the intake temp sensor and it fixed it for about a year and a half. Its started doing it again twice since then and both times it has been vacuum leaks.
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  #10  
Old 12-09-2010, 04:45 AM
ecogenie ecogenie is offline
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Default Re: Acceleration at Stop?

Okay everybody I went to Auto Zone yesterday and the parts person there took an engine test on his code gadget. It showed 125. The thermostat is not working. When I bought the truck it did not have a thermostat in it. Said that this without a thermostat that it would give a false reading to the sensor and it would mess with the accelerator. Does this sound like something to look into? Your help has been very much appreciated. Let me know what you think. Thanks! (Can't figure out how to take off the housing for the thermostat. Any comments? 2.5Liter engine)
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  #11  
Old 12-09-2010, 07:36 AM
terryduanemiller terryduanemiller is offline
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Default Re: Acceleration at Stop?

Quote:
Originally Posted by ecogenie View Post
Okay everybody I went to Auto Zone yesterday and the parts person there took an engine test on his code gadget. It showed 125. The thermostat is not working. When I bought the truck it did not have a thermostat in it. Said that this without a thermostat that it would give a false reading to the sensor and it would mess with the accelerator. Does this sound like something to look into? Your help has been very much appreciated. Let me know what you think. Thanks! (Can't figure out how to take off the housing for the thermostat. Any comments? 2.5Liter engine)
its only 2 10mm bolts, they r kinda hidden, replace the Tstat.. if it still does it do the BB trick
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  #12  
Old 12-09-2010, 01:55 PM
00bamaranger 00bamaranger is offline
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Default Re: Acceleration at Stop?

Yes look into that. I forgot to say that the very first time mine was doing it (actually was doing it when I bought the truck) I replaced the two temp sensors on the thermostat housing and it fixed it until the IAC went out 6 months later.
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  #13  
Old 12-10-2010, 08:23 AM
ecogenie ecogenie is offline
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Default Re: Acceleration at Stop?

Quote:
Originally Posted by terryduanemiller View Post
its only 2 10mm bolts, they r kinda hidden, replace the Tstat.. if it still does it do the BB trick
Not kidding when you say hidden. This is my only problem now in finding the one on the left side. Can't even get my hand in there to feel where it is located. There are many things in the way. What do I need to do to get in there? If you have done this before how did you do it exactly? Why did they design it the way they did!!! Crazy.
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