I have a 98 Outback Limited with a P1507 code, I just replaced the neutral switch as well as the IAC valve complete. Neither have fixed it. I still get the error code and then the limp mode runs on 2-3 cylinders. I cycle the ignition and it runs OK for anywhere from 30 to 3,000 miles.

 

Prior to these recent repairs I have replaced the following in the last year:

head gasket update

intake gaskets

exhaust flange gaskets

outer valve cover gaskets

inner valve cover gaskets

valve cover bolt seals

rear cam plugs

cam seals

exhaust flange nuts

oil and filter (regularly)

drain plug gasket

coolant

belts

radiator

crankcase breather update

timing belt

tensioner

idlers

water pump

thermostat

clutch

fuel pump and sending unit

alternator

coil

ECU

speed sensor

CV boot right passenger front under Cat

cleaned connections on speedometer

 

Car has 171k on it, doesn't smoke, consumes 1 qt oil every 2k, local ROOPair shop can't figure it out, please help!

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Edited December 5, 201015 yr by mustangthegreat
no response

You might have a bad throttle body. I got this code and ended up replacing my throttle body which fixed it.

I will try that, thanks

Well you've done a lot of work to it. When did this problem start? Is this an auto or manual trans?

My local Subaru shop found a TSB on bad grounds for this problem for this model, it described cleaning all of the grounds and it appears to have worked.

 

Before this they also replaced the speedometer. Car has a new life now.

it is a stick

nice hit, report back in a while if you think about it and let us know it's fixed for sure or you drove it off a cliff. i'd never heard of that one before.

 

glad you figured it out, that's tricky. makes me want to clean my grounds.

My local Subaru shop found a TSB on bad grounds for this problem for this model, it described cleaning all of the grounds and it appears to have worked.

 

Before this they also replaced the speedometer. Car has a new life now.

 

As I recall there are two main grounds, one on either side of the engine.

As I recall there are two main grounds, one on either side of the engine.

i also noticed a ground point centrally located on the fire wall just behind the throttle body i thought on my 02. but that's newer and i'm not sure what they're grounds for.

still runs great after 1000 miles:headbang:

Bad ground. Imagine that. You just never know what a bad ground wire will screw up. Speaking of... that gives me an idea for another problem thread...