Idle sky rocket after a hard run...

smh0101 · Post by **smh0101** » Tue Apr 15, 2008 7:09 am

So, after a semi-hard freeway run the idle launches itself up to about 3k.

Like, if I push in the clutch the rpm goes up to about 3-3.25k

Its kind of annoying. Any thoughts? Is the IAC valve sticking or something?

PhyrraM · Post by **PhyrraM** » Tue Apr 15, 2008 7:26 am

clutch switch, idle switch, or possibly a bad TPS?

Do you have a way of running Vikash's scan tool or even teh VWRX one?

smh0101 · Post by **smh0101** » Tue Apr 15, 2008 7:27 am

Not really...

I could try and replace the TPS with the one off my old engine... I suppose...

smh0101 · Post by **smh0101** » Tue Apr 15, 2008 7:29 am

Ya know... after I blip the throttle it goes back down to normal...

I'll try the tps

PhyrraM · Post by **PhyrraM** » Tue Apr 15, 2008 7:29 am

If you replace it you will probably need a digital multi meter to set it properly.

Safer to swap the whole throtlebody.

smh0101 · Post by **smh0101** » Tue Apr 15, 2008 7:30 am

Hrms... Okay... I suppose I could do that... How hard would that be?

555BCTurbo · Post by **555BCTurbo** » Tue Apr 15, 2008 7:34 am

Just change the entire throttlebody...

Check for vacuum leaks too!

smh0101 · Post by **smh0101** » Tue Apr 15, 2008 7:37 am

555BCTurbo wrote: Check for vacuum leaks too!

I had enough of those!!!

Re-did a ton of vac lines to fix some...

There was one other issue... when I was up in the upper rpms in 4th gear it would cut like fuel cut then continue up the rev range.

Me redoing the coffee cup mod fixed that though... it had some thing to with it because it went away after that.

555BCTurbo · Post by **555BCTurbo** » Tue Apr 15, 2008 7:38 am

smh0101 wrote:
Me redoing the coffee cup mod fixed that though... it had some thing to with it because it went away after that.

Metered air leak...

smh0101 · Post by **smh0101** » Tue Apr 15, 2008 7:40 am

Gotcha... I re-did it with brass fittings and lots of JB Weld and black paint to fix it.

555BCTurbo · Post by **555BCTurbo** » Tue Apr 15, 2008 7:44 am

smh0101 wrote:Gotcha... I re-did it with brass fittings and lots of JB Weld and black paint to fix it.

Ah yes...nothing like good ole' black paint to fix everything!

smh0101 · Post by **smh0101** » Tue Apr 15, 2008 7:45 am

hahaha... lol Yup!

Does look better though!

asc_up · Post by **asc_up** » Tue Apr 15, 2008 7:54 am

Hey! I painted mine black, too. So no hating...

ericem · Post by **ericem** » Wed Apr 16, 2008 3:32 am

If you blip it and it comes back its most likely the IAC valve. My car did that and sometimes low idle. Sprayed throttle body cleaner which was made for IAC valves as well (ones that don't say that are bad) or wd40 works as well.

smh0101 · Post by **smh0101** » Mon Apr 21, 2008 4:39 am

FIXED!

So after spraying the SHIT out of the IAC Valve... It didnt do a damn thing

So I replaced the throttle body...

Whalah! All is well now... and runs quite nicely I might add!

555BCTurbo · Post by **555BCTurbo** » Mon Apr 21, 2008 7:10 am

smh0101 wrote:
So I replaced the throttle body...

I won't even say it

smh0101 · Post by **smh0101** » Mon Apr 21, 2008 7:36 am

Say what? I must be too tired to get it...

555BCTurbo · Post by **555BCTurbo** » Mon Apr 21, 2008 7:39 am

smh0101 wrote:Say what? I must be too tired to get it...

That I was right lol

smh0101 · Post by **smh0101** » Mon Apr 21, 2008 7:48 am

Oh... Yeah... you and Phyrra were

I guess that means TPS was going bad?

555BCTurbo · Post by **555BCTurbo** » Mon Apr 21, 2008 7:50 am

smh0101 wrote:
I guess that means TPS was going bad?

Quite possibly...also, your throttlebody could have been getting stuck somehow

smh0101 · Post by **smh0101** » Mon Apr 21, 2008 7:52 am

The throttlebody seemed fine... It seemed to flip back to normal just fine...

Post by **Legacy777** » Mon Apr 21, 2008 6:01 pm

Did your TB have the adjustment screw for the air bypass on the top of it?

http://www.main.experiencetherave.com/subaru/images/tb/

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Idle sky rocket after a hard run...

Idle sky rocket after a hard run...