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Hunt and Peck Idle at cold start + horrible throttle response
Hunt and Peck Idle at cold start + horrible throttle response
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Old 10-10-12, 04:01 AM   #1
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Default Hunt and Peck Idle at cold start + horrible throttle response

Hey guys.

I did a quick search but didnt really find anything that was similar to my situation. Basically on a cold start, the car starts up normal but after 10 sec or so it starts hunting around rpms like in this video. Once it warms up, the crazy idle stops.

Not my video. EDIT:i cant get the video to embed: STI 2007 cold start problem - YouTube

On top of that, i've been having pretty horrible throttle response. When im idle, and i give it a little gas, it will stumble for a second and then rev up and same when i downshifting and blip the gas.

72k on the car and it hasn't been driven much at all in the last 6 months maybe about 2k miles? could it be a dirty MAF? I know the drive by wires dont have a iacv...
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Old 10-11-12, 07:27 AM   #2
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Default Re: Hunt and Peck Idle at cold start + horrible throttle response

no one has any idea? :/
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Old 10-11-12, 09:46 AM   #3
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Default Re: Hunt and Peck Idle at cold start + horrible throttle response

Check the TGVs, MAF, possible vaccuum leak.

Modlist will help? what tune are you running?

The more information you give, the better answers you will get.
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Old 10-11-12, 09:50 AM   #4
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Default Re: Hunt and Peck Idle at cold start + horrible throttle response

Fuel & Tuning:
Cobb AccessPort v2
93 Unleaded
850cc DW injectors
NGK one step colder spark plugs
Walbro 255l fuel pump
Grimmspeed ECBS
Efi Protune
Engine
Gates Racing Belts (AC/Alt)
Motul 5w30

Exhaust / Intake:
Invidia N1 Catback Exhaust
Invidia V2 Catless Downpipe
Stock Airbox w/ K&N filter and silencer delete
Grimmspeed Uppipe with EWG Kit and Dumptube
Tial 38mm External Wastegate
Perrin Turbo Blanket
DEI Gold tape on intercooler

it gets worse the colder it is outside in the morning. Vacuum leak would be still be present when it warmed up unless it was a very very small leak. what to check on the TGVs = the motors?
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Old 10-11-12, 09:52 AM   #5
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Default Re: Hunt and Peck Idle at cold start + horrible throttle response

Compression test is where I would start.
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Old 10-11-12, 10:23 AM   #6
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Default Re: Hunt and Peck Idle at cold start + horrible throttle response

It might have something to do with the maf sensor because the car is reading off of the maf sensor only, on cold start ups. Then the o2 sensor kicks in once it gets up to temperature which could be the reason that the problem goes away. Try cleaning or even replacing your maf sensor. Or if you know some other subie owners, ask them to loan you theirs for second.

I had the same thing happen to my car but opposite. It happened when it got warm(when the o2 sensor kicked in) and didn't happen when it was cold because it was only running off the maf.
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Old 10-11-12, 10:32 AM   #7
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Default Re: Hunt and Peck Idle at cold start + horrible throttle response

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Originally Posted by farmboss View Post
It might have something to do with the maf sensor because the car is reading off of the maf sensor only, on cold start ups. Then the o2 sensor kicks in once it gets up to temperature which could be the reason that the problem goes away. Try cleaning or even replacing your maf sensor. Or if you know some other subie owners, ask them to loan you theirs for second.

I had the same thing happen to my car but opposite. It happened when it got warm(when the o2 sensor kicked in) and didn't happen when it was cold because it was only running off the maf.
that seems like a good idea. i'll pick up some maf cleaner this weekend and give it a quick shoot. taking out the maf is a lot easier than ripping the coilpacks and plugs to do a compression test.

you know what, know that i'm thinking about it, if i blip the gas while its doing its rpm dance, it will stop right away...
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Old 10-11-12, 10:42 AM   #8
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Default Re: Hunt and Peck Idle at cold start + horrible throttle response

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Originally Posted by badcop View Post
that seems like a good idea. i'll pick up some maf cleaner this weekend and give it a quick shoot. taking out the maf is a lot easier than ripping the coilpacks and plugs to do a compression test.

you know what, know that i'm thinking about it, if i blip the gas while its doing its rpm dance, it will stop right away...
Try unplugging your maf and then starting the car, when its cold. See if it runs any better, you will get a CEL but if it runs better then it is the maf. Or unplug it while its running, might cut the car off though.
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Old 10-12-12, 04:14 AM   #9
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Default Re: Hunt and Peck Idle at cold start + horrible throttle response

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Originally Posted by farmboss View Post
Try unplugging your maf and then starting the car, when its cold. See if it runs any better, you will get a CEL but if it runs better then it is the maf. Or unplug it while its running, might cut the car off though.
This is it. i started it this morning (about 40 degrees F) and it was starting to rev up. i pulled the maf harness and it immediately leveled out.

NOW i have a CEL and the cruise is flashing. after i clean the maf should i pull the battery term to do a reset to get rid of the cel?
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Old 10-12-12, 06:49 AM   #10
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Default Re: Hunt and Peck Idle at cold start + horrible throttle response

Quote:
Originally Posted by badcop View Post
This is it. i started it this morning (about 40 degrees F) and it was starting to rev up. i pulled the maf harness and it immediately leveled out.

NOW i have a CEL and the cruise is flashing. after i clean the maf should i pull the battery term to do a reset to get rid of the cel?
plug in you ap with the key in the on position, go to the troubleshooting menu, reset the ecu from there. That will clear your code.
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