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Old 07-30-2012, 06:56 PM   #1
DRTHVDR
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Default Another P1507 code thread.

Car: 2000 Impreza RS Manual SOHC
Symptoms: At start the engine revs to 3000 RPMs, then settles down to 2000 RPM, the computer throws a P1507 CEL and the revs drop down to 1100 RPM with a mild lumpy idle.
While driving the car at a steady speed, the engine revs will decline on it's own until I add more throttle. This only happens when I'm driving at a consistent RPM. It's instantly responsive to throttle inputs and doesn't even hint at stalling.

First off I've done a ton of searching here and on other Subaru forums. I'm going through a process of elimination of the typical faulty items.
I cleaned off the IACV and also swapped on another one I had around. No change.
I adjusted my throttle cables so that they are not applying any pull on the throttle body while at idle. No change.
I re-tightened down the intake manifold (brand new manifold) in case there were any leaks. No change.
I sprayed engine starter fluid at all the seams/seals on the intake hoping to find an air leak. The engine revs did not increase no matter where I sprayed.
So now I'm ordering a Neutral Position Switch since I unplugged that tonight and no new CEL came on or noticed any change in the idle.

Any inputs from those who have experienced this in the past or are currently undergoing this annoying problem I more than ask for your input.
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Old 07-30-2012, 10:32 PM   #2
J.Gibbs
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Like I said before man im in the same boat as you. Same code. Fully rebuilt engine, new IACV, tps, EGR, vacuum lines, injector o rings, pcv, neutral switch, cleaned throttle body, all that fun stuff. My idle is at about 1200. Not too bad and car doesn't run poorly. Just the cel means no sticker for me and my emissions rejection was up last November lol
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Old 08-02-2012, 06:52 PM   #3
DRTHVDR
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Well I changed the IACV and no change. I am out of ideas and fix's.
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Old 08-02-2012, 11:24 PM   #4
J.Gibbs
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Im gonna play with torque tomoro and see if I can find some info to as why we have this code
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Old 08-03-2012, 09:14 AM   #5
DRTHVDR
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I have 'torque' as well. I don't know how it's going to help fix the issue though. Perhaps you know how to use that app better than I.
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Old 08-03-2012, 07:36 PM   #6
J.Gibbs
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Quote:
Originally Posted by DRTHVDR
I have 'torque' as well. I don't know how it's going to help fix the issue though. Perhaps you know how to use that app better than I.
You can read almost everything from the ecu. Vacuum info all that stuff. Points you in the right direction.
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Old 08-05-2012, 12:50 PM   #7
DRTHVDR
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Quote:
Originally Posted by J.Gibbs View Post
You can read almost everything from the ecu. Vacuum info all that stuff. Points you in the right direction.
Oh. I know all that and used it to check vacuum. I was thinking you had some secret knowledge about torque that I didn't know about.
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Old 08-05-2012, 02:55 PM   #8
J.Gibbs
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Quote:
Originally Posted by DRTHVDR

Oh. I know all that and used it to check vacuum. I was thinking you had some secret knowledge about torque that I didn't know about.
What did your data log say for the code?
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Old 08-06-2012, 08:14 AM   #9
DRTHVDR
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P1507. That's how I knew what code it threw and where to start fixing it.
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