Car drives fast without touching gas - Mustang Evolution

Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 09-13-2014, 05:31 PM   #1
Registered Member
Regular
 
Iryan7's Avatar
 
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 219
Question Car drives fast without touching gas

Whenever I start my car and put it in drive, my car will go on its own. I don't mean the "normal" 1-3 mph. Sometimes my car will go 15-25 mph (on a straight road) without me ever touching the gas. Is this normal for these cars, or is something adjusted weird on my car? (Only owned it since March 2014)
Thanks in advance for any help guys.
Iryan7 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-13-2014, 05:57 PM   #2
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,409
When the car is idling and you have it in gear, stopped, with your foot on the brake, how many RPM's is the tachometer reading?
straybullitt is offline   Reply With Quote
Old 09-13-2014, 06:01 PM   #3
Registered Member
Regular
 
Iryan7's Avatar
 
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 219
Right at 750Click image for larger version

Name:	ImageUploadedByMustang Evolution1410649248.526853.jpg
Views:	102
Size:	686.2 KB
ID:	165916


Sent from my iPhone using Mustang Evolution
Iryan7 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-13-2014, 06:06 PM   #4
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,409
Ok. That's where it should be.
When you rev the engine to about 3000 RPM's, how long does it take for the RPM's to drop back down to 750?
Do they sometimes "hang" at around 1200 for a bit and then drop to 750?

This is with the car idling in park, of course.
straybullitt is offline   Reply With Quote
Old 09-13-2014, 06:13 PM   #5
Registered Member
Regular
 
Iryan7's Avatar
 
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 219
No it falls right back down to just below 600 then 750


Sent from my iPhone using Mustang Evolution
Iryan7 is offline   Reply With Quote
Old 09-13-2014, 06:21 PM   #6
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,409
Lol
You're not making this easy Ryan!

Ok. How about if the A/C is on, the engine is running and in gear, you're holding the brake, and you rev the engine a little, to maybe 1500 RPM's.
Do the RPM's drop right back down to around 700 or do they "hang" a while above 1000?
straybullitt is offline   Reply With Quote
Old 09-13-2014, 06:25 PM   #7
Registered Member
Regular
 
Iryan7's Avatar
 
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 219
Car drives fast without touching gas

With AC on it does have a slight hang around 1,000


Sent from my iPhone using Mustang Evolution
Iryan7 is offline   Reply With Quote
Old 09-13-2014, 06:27 PM   #8
Registered Member
Regular
 
Join Date: Jun 2014
Location: Parniak
Region: Wisconsin
Posts: 618
man, crawl up under the dash and grab the pedal, lift it up and you should see some slack in the cable. Is it tight? pop the hood check the throttle cable and linkage, maybe something got jammed up.. I know that seems simple but its first thing I would check if my car was driving on its own lol
TurboCobra is offline   Reply With Quote
Old 09-13-2014, 06:30 PM   #9
Registered Member
Regular
 
Iryan7's Avatar
 
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 219
I'll give that a check in a second also, I forgot to mention when it drives fast it staying about 1,000 rpm. Hopefully that helps


Sent from my iPhone using Mustang Evolution
Iryan7 is offline   Reply With Quote
Old 09-13-2014, 06:31 PM   #10
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,409
Ugh.

When it seems to be going 20-25 down a level road all on it's own, will it accelerate to that speed from a dead stop without touching the gas? Or is it just maintaining that speed after you let off the gas?
And does it do this all of the time? Or just sometimes?
straybullitt is offline   Reply With Quote
Old 09-13-2014, 06:31 PM   #11
Registered Member
Regular
 
Join Date: Jun 2014
Location: Parniak
Region: Wisconsin
Posts: 618
push all your cruise control buttons and check the cable as well. who knows could be stuck on some how
TurboCobra is offline   Reply With Quote
Old 09-13-2014, 06:35 PM   #12
Registered Member
Regular
 
Iryan7's Avatar
 
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 219
Quote:
Originally Posted by straybullitt View Post
Ugh.



When it seems to be going 20-25 down a level road all on it's own, will it accelerate to that speed from a dead stop without touching the gas? Or is it just maintaining that speed after you let off the gas?

And does it do this all of the time? Or just sometimes?

It will gradually get up to that speed without touching the gas. It doesn't take long on straight roads. Also, it always does this.



Sent from my iPhone using Mustang Evolution
Iryan7 is offline   Reply With Quote
Old 09-13-2014, 06:48 PM   #13
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,409
Well it seems that your Idle Air Control valve is functioning reasonably well.
I'm somewhat suspicious that your speed sensor way be malfunctioning and is sending incorrect information to the computer.
These cars are designed to hold a higher idle when rolling so that the Hydro-boost system has enough power to assist with the power steering and power brakes.
I assume that your Check Engine Light is NOT staying lit, but I recommend having the computer scanned for trouble codes that may be "pending". There may be a clue to what is making your engine idle high, for so long, while the car is rolling.
straybullitt is offline   Reply With Quote
Old 09-13-2014, 07:17 PM   #14
Registered Member
Regular
 
Iryan7's Avatar
 
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 219
Alright, I'll get that checked. Thanks guys


Sent from my iPhone using Mustang Evolution
Iryan7 is offline   Reply With Quote
Old 09-13-2014, 07:22 PM   #15
Registered Member
Regular
 
Join Date: Mar 2013
Location: Salinas
Region: California
Posts: 7,409
If you don't live in California, most of the big auto parts stores will scan the computer for free.
straybullitt is offline   Reply With Quote
Old 09-22-2014, 03:10 PM   #16
Registered Member
Regular
 
Join Date: Jun 2014
Location: Parniak
Region: Wisconsin
Posts: 618
so how did you stop the ghost car?
TurboCobra is offline   Reply With Quote
Old 09-25-2014, 01:06 AM   #17
Registered Member
Regular
 
Iryan7's Avatar
 
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 219
Well I turned my idle down just a tad, but it still drives itself. So to put it simply, I didn't stop it. I'm just learning to live with it. Its not as bad as it was though.


Sent from my iPhone using Mustang Evolution
Iryan7 is offline   Reply With Quote
Old 09-25-2014, 01:08 AM   #18
Registered Member
Regular
 
Iryan7's Avatar
 
Join Date: Jun 2014
Location: Chilhowie
Region: Virginia
Posts: 219
Also, I had my codes scanned and nothing is showing up. Clueless.


Sent from my iPhone using Mustang Evolution
Iryan7 is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Any tips on touching up aftermarket rims? Sandman 2011-2014 V6 Mustang 2 05-28-2013 09:28 AM
Touching up Plasti Dip RVAStang05 2005-2010 Mustang GT 10 12-29-2011 02:00 PM
A Touching Elephant Story Herbstang The Bar 9 01-08-2007 02:01 PM
Touching Tail Herbstang The Bar 6 09-14-2006 10:18 AM
Another touching moment the media never wanted to tell people about Seph The Bar 7 12-12-2004 09:46 PM

» Like Us On Facebook



04:19 PM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.