Throttle wont go back down

[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?

[95v686gt]

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?

[97Stallion]

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.

[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

[95v686gt]

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

[austinknoll]

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

[mustangg2000]

Yeah I believe you can

[Surffer227]

Yea, I have that problem, I cleaned it a few months ago, with carb cleaner, and it's starting to do it again :/

[l2plagears]

Check for vac leaks in the upper plenum i had this problem due to blown throttle body gasket

[austinknoll]

I'll check that out too. I tried pulling my throttle body off but It seems stuck on something. Weird

[robb15033]

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.

[austinknoll]

Originally Posted by robb15033

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.

[austinknoll]

What should I clean the iac with?

[Bballing0416]

It may be the throttle positioning sensor. (tps)

[austinknoll]

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

[Surffer227]

You unplug your iac to see the difference not the maf

[robb15033]

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.

[Hutchstang]

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 ----------

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.

[robb15033]

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-