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Old 02-13-2011, 11:08 PM   #1
humboldt2.5rex
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2001 2.5RS
Sedona Red Pearl

Default Jdm Ver 8 Sti Swap stumble/surge when warm- Help

So just finishing up with my 2001 2.5rs--> Ver 8 JDM STI EJ207 swap and just got it up ad running and am having a little stumble once the engine warms up.

The car will idle at 2000 rpms when you cold start it and after a few minutes of running and warming up the car will stay at 2000 rpms and then dip to 1500 rpms, then back up to 2000, over and over.

Before the surging starts I can rev up the engine but after warm and surging starts if I hit the accelerator it will stumble and drop revs. As far as I can tell I believe it is either a problem with the TPS sensor or the idle solenoid but would like to get some feedback to see if anyone has had this type of problem before or how I could test for it?

Any help would be much appreciated-- Thanks-- Lars
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Old 02-17-2011, 03:26 PM   #2
humboldt2.5rex
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anyone?
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Old 02-17-2011, 03:47 PM   #3
Homemade WRX
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sounds like you have the right idea (hardware) and not swap related.

Snag a spare TPS and slap it on...or idle solenoid. That's the easiest way to check it in my opinion. Have a buddy with a WRX come over, grab his TPS (two seconds) and slap it on. See if the issue goes away.
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Old 02-17-2011, 10:26 PM   #4
humboldt2.5rex
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That is basically what I was thinking of doing- Are the TPS and IACV the same parts on all 02-07 Wrx and STI's? As far as I know they are, just checking though?
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