Throttle wont go back down - 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 05-07-2012, 03:04 PM   #1
Registered Member
Regular
 
austinknoll's Avatar
 
Join Date: Jan 2011
Location: San Diego
Region: California
Posts: 1,147
Throttle wont go back down

Kay so I have a manual v6 and when I put in the clutch the rpms usually sink but thy just sit around 2000 rpms. Even when just neutral the rpms dont go back down to normal. They won't go back down. My dad said maybe motor mounts. What do you guys think?
__________________
65 Mustang coupe
306 H/C/I, holley 4 barrel, T5, Hurst Shifter, Subframe connectors, 8.8 w/ 3.55 posi, 4 piston front disc brakes, SN95 rear disc brakes, shelby drop, 620 springs, Mideye 4.5 Leaf Springs, bilstein shocks.
austinknoll is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 05-07-2012, 03:40 PM   #2
Registered Member
Regular
 
95v686gt's Avatar
 
Join Date: Mar 2012
Region: Kentucky
Posts: 813
Quote:
Originally Posted by austinknoll
Kay so I have a manual v6 and when I put in the clutch the rpms usually sink but thy just sit around 2000 rpms. Even when just neutral the rpms dont go back down to normal. They won't go back down. My dad said maybe motor mounts. What do you guys think?
Motor mounts do not affect idle..... Is the cel on?
__________________
1995 V6 Mustang= Divorced Duals, Flowmaster 2 chambers, NO CATS, Raxiom Halo Projector headlights, Smoked Tails, 17 inch Bullitt Wheels
1997 Mustang GT: 4.6L DOHC http://www.mustangevolution.com/forum/f280/t305270/
1986 Mustang GT= Built 302 SOLD
95v686gt is offline   Reply With Quote
Old 05-07-2012, 03:47 PM   #3
Legacy Member
Legacy
 
97Stallion's Avatar
 
Join Date: Nov 2003
Region: Missouri
Posts: 1,461
Send a message via AIM to 97Stallion Send a message via MSN to 97Stallion
Re: Throttle wont go back down

what you need to make is a IAC restrictor plate. This will help your car idle at a lower RPM and when you're driving along you won't get thouse hanging RPM which is a common thing for manual trannies. Also it wouldn't hurt to clean out your MAF and IAC. Use some electrical spray cleaner for the MAF and some carbon cleaner for the IAC.
__________________

60' ~ 2.1, 1/8 ~ 9.61 @ 73.4mph
Living one day at a time!

DAMN Those are some old *** numbers!!! I need updated ones!!
97Stallion is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 05-07-2012, 03:54 PM   #4
Registered Member
Regular
 
mustangg2000's Avatar
 
Join Date: Nov 2011
Region: Arkansas
Posts: 654
^ exactly check IAC (idle air control) valve maybe bad or just dirty like ^ said clean it and MAF (mass air flow) sensor with some sea foam and ur mounts don't effect your engine idle they only effect the wobble lol
mustangg2000 is offline   Reply With Quote
Old 05-07-2012, 04:03 PM   #5
Registered Member
Regular
 
95v686gt's Avatar
 
Join Date: Mar 2012
Region: Kentucky
Posts: 813
Quote:
Originally Posted by mustangg2000
^ exactly check IAC (idle air control) valve maybe bad or just dirty like ^ said clean it and MAF (mass air flow) sensor with some sea foam and ur mounts don't effect your engine idle they only effect the wobble lol
Idling that high is a sign of bad iac. Not so much the hanging rpm. If the cel is on and throws a code for it try cleaning it if that doesn't work replace it
__________________
1995 V6 Mustang= Divorced Duals, Flowmaster 2 chambers, NO CATS, Raxiom Halo Projector headlights, Smoked Tails, 17 inch Bullitt Wheels
1997 Mustang GT: 4.6L DOHC http://www.mustangevolution.com/forum/f280/t305270/
1986 Mustang GT= Built 302 SOLD
95v686gt is offline   Reply With Quote
Old 05-07-2012, 07:16 PM   #6
Registered Member
Regular
 
austinknoll's Avatar
 
Join Date: Jan 2011
Location: San Diego
Region: California
Posts: 1,147
Can I clean the iac with carb cleaner? I took apart my intake today and put my aftermarket one back on and sprayed maf cleaner into it do that is cleaned. I still have check the cel but it has been on because I have cats failing
__________________
65 Mustang coupe
306 H/C/I, holley 4 barrel, T5, Hurst Shifter, Subframe connectors, 8.8 w/ 3.55 posi, 4 piston front disc brakes, SN95 rear disc brakes, shelby drop, 620 springs, Mideye 4.5 Leaf Springs, bilstein shocks.
austinknoll is offline   Reply With Quote
Old 05-07-2012, 07:22 PM   #7
Registered Member
Regular
 
mustangg2000's Avatar
 
Join Date: Nov 2011
Region: Arkansas
Posts: 654
Yeah I believe you can
mustangg2000 is offline   Reply With Quote
Old 05-07-2012, 08:24 PM   #8
Registered Member
Regular
 
Surffer227's Avatar
 
Join Date: Jan 2012
Region: Florida
Posts: 570
Yea, I have that problem, I cleaned it a few months ago, with carb cleaner, and it's starting to do it again :/
Surffer227 is offline   Reply With Quote
Old 05-07-2012, 09:18 PM   #9
Registered Member
Regular
 
Join Date: Sep 2011
Region: Florida
Posts: 274
Re: Throttle wont go back down

Check for vac leaks in the upper plenum i had this problem due to blown throttle body gasket
l2plagears is offline   Reply With Quote
Old 05-08-2012, 01:05 AM   #10
Registered Member
Regular
 
austinknoll's Avatar
 
Join Date: Jan 2011
Location: San Diego
Region: California
Posts: 1,147
I'll check that out too. I tried pulling my throttle body off but It seems stuck on something. Weird
__________________
65 Mustang coupe
306 H/C/I, holley 4 barrel, T5, Hurst Shifter, Subframe connectors, 8.8 w/ 3.55 posi, 4 piston front disc brakes, SN95 rear disc brakes, shelby drop, 620 springs, Mideye 4.5 Leaf Springs, bilstein shocks.
austinknoll is offline   Reply With Quote
Old 05-09-2012, 12:09 PM   #11
Registered Member
Regular
 
robb15033's Avatar
 
Join Date: Oct 2010
Location: Northern Virginia
Region: Virginia
Posts: 2,109
Re: Throttle wont go back down

If the IAC is dirty, I would concentrate on the cause too. Our V6's pull alot of oil vapor & condensate through the pcv valve. Also really sensitive to the smallest vacuum leak. CAI connections have to be tight, egr vacuum lines checked for leaks. And I know I have said it a million times but a 5 minute job with Seafoam improves performance greatly on my car every couple of months. Put a straw in the can, pull out the pvc, put the straw up to the pcv valve and let it suck up slowly. Works well.
__________________
'97 3.8L V6
Pacific Green
1996 SVT Cobra White
robb15033 is offline   Reply With Quote
Old 05-10-2012, 10:53 PM   #12
Registered Member
Regular
 
austinknoll's Avatar
 
Join Date: Jan 2011
Location: San Diego
Region: California
Posts: 1,147
Re: Throttle wont go back down

Quote:
Originally Posted by robb15033 View Post
If the IAC is dirty, I would concentrate on the cause too. Our V6's pull alot of oil vapor & condensate through the pcv valve. Also really sensitive to the smallest vacuum leak. CAI connections have to be tight, egr vacuum lines checked for leaks. And I know I have said it a million times but a 5 minute job with Seafoam improves performance greatly on my car every couple of months. Put a straw in the can, pull out the pvc, put the straw up to the pcv valve and let it suck up slowly. Works well.
ill clean it out `with carb cleaner? is that safe? and would a dirty IAC or broken IAC make the idle freak out randomly? cause what happens is when i come to a stop or just letting the car move at idle after a little driving the car tries to die. sometimes the IAC saves it but it has died a couple times in the parking lot.
__________________
65 Mustang coupe
306 H/C/I, holley 4 barrel, T5, Hurst Shifter, Subframe connectors, 8.8 w/ 3.55 posi, 4 piston front disc brakes, SN95 rear disc brakes, shelby drop, 620 springs, Mideye 4.5 Leaf Springs, bilstein shocks.
austinknoll is offline   Reply With Quote
Old 05-11-2012, 02:49 PM   #13
Registered Member
Regular
 
austinknoll's Avatar
 
Join Date: Jan 2011
Location: San Diego
Region: California
Posts: 1,147
What should I clean the iac with?
__________________
65 Mustang coupe
306 H/C/I, holley 4 barrel, T5, Hurst Shifter, Subframe connectors, 8.8 w/ 3.55 posi, 4 piston front disc brakes, SN95 rear disc brakes, shelby drop, 620 springs, Mideye 4.5 Leaf Springs, bilstein shocks.
austinknoll is offline   Reply With Quote
Old 05-11-2012, 02:56 PM   #14
Registered Member
Regular
 
Bballing0416's Avatar
 
Join Date: Aug 2011
Region: Ohio
Posts: 286
It may be the throttle positioning sensor. (tps)
Bballing0416 is offline   Reply With Quote
Old 05-11-2012, 03:19 PM   #15
Registered Member
Regular
 
austinknoll's Avatar
 
Join Date: Jan 2011
Location: San Diego
Region: California
Posts: 1,147
I'm starting to think it is the maf because when I unplug it the engine doesn't even seem to phase. I revved it and isn't phase it
__________________
65 Mustang coupe
306 H/C/I, holley 4 barrel, T5, Hurst Shifter, Subframe connectors, 8.8 w/ 3.55 posi, 4 piston front disc brakes, SN95 rear disc brakes, shelby drop, 620 springs, Mideye 4.5 Leaf Springs, bilstein shocks.
austinknoll is offline   Reply With Quote
Old 05-11-2012, 09:46 PM   #16
Registered Member
Regular
 
Surffer227's Avatar
 
Join Date: Jan 2012
Region: Florida
Posts: 570
You unplug your iac to see the difference not the maf
Surffer227 is offline   Reply With Quote
Old 05-12-2012, 12:18 AM   #17
Registered Member
Regular
 
robb15033's Avatar
 
Join Date: Oct 2010
Location: Northern Virginia
Region: Virginia
Posts: 2,109
Re: Throttle wont go back down

Carb cleaner is for soaking parts, never to be used while engine is running. Performing a Seafoam induction cleaning will clean all mentioned parts above and save you $500.00 for an induction cleaning using an IV bag drip.
MAF sensors have to be sprayed with "MAF cleaner" ONLY. Make sure you have no CAI connection leaks, no egr tubing line leaks and buy 2 can of Seafoam and just do it. It takes 10 minutes. One can in gas tank, one can slowly sucked up the pcv valve while engine is running. It will smoke a little and then stop. Performance will increase and it will help you stop second guessing this or that, just do it and get it over with.
__________________
'97 3.8L V6
Pacific Green
1996 SVT Cobra White
robb15033 is offline   Reply With Quote
Old 05-12-2012, 07:21 PM   #18
Registered Member
Regular
 
Hutchstang's Avatar
 
Join Date: Feb 2012
Region: New York
Posts: 160
You let the pcv suck up the whole can of seafoam? And how slow we talking here?

---------- Post added at 08:21 PM ---------- Previous post was at 08:18 PM ----------

Quote:
Originally Posted by Hutchstang
You let the pcv suck up the whole can of seafoam? And how slow we talking here?
I just had an extremely fast/harsh 1200 mile drive and I'm thinking I want to try that seafoam pcv business out. I've stuck some in the gas and oil before. Don't know if it did anything or not, didn't really notice. But if it's cleaning stuff out then great. $16 well spent.
Hutchstang is offline   Reply With Quote
Old 05-13-2012, 07:56 AM   #19
Registered Member
Regular
 
robb15033's Avatar
 
Join Date: Oct 2010
Location: Northern Virginia
Region: Virginia
Posts: 2,109
Re: Throttle wont go back down

Yes, you pull the Seafoam up into the upper intake manifold with a vacuum hose of your choice. I recommend the pcv valve because it's easy for people to identify and it cleans the pcv valve its self and the line leading up to the upper intake. You let it suck up a little at a time, 1-2 second intervals. It will not harm anything. That's what it is made for. Read the can. Go to their website, look it up on you-tube with V6 Mustangs. Call a local shop or Mustang shop. It will help the engine run smoother. I don't know if it will fix your problem completely but it will help things in general. Probably have a vacuum leak somewhere. One place I would never put Seafoam, is in the oil. My engine is clean & I routinely monitor all my fluids. Good luck with it all-
__________________
'97 3.8L V6
Pacific Green
1996 SVT Cobra White
robb15033 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


» Like Us On Facebook



05:41 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.