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Guest Message by DevFuse

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Help please. Engine running very rough and p1507 code.

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3 replies to this topic

#1 rjp98outlook


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Posted 13 December 2004 - 10:27 AM

This morning my car was hard to start. When if finally did start, it appeared to be running fine, but 1 mile down the road it stalled. I restarted (check engine on now). Appears to be running on 1 or 2 cylinders and could just barely drive back home. Could not exceed more than about 10 MPH. Stalls with foot off gas. Only one engine code stored 1507. This problem came on suddenly. My car was running perfectly up till yesterday. I think the code indicates a problam with the idle control, but I think this is probably secondary to the problem. Something is causing some cylinders not to function.

Thanks for any help

#2 Setright


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Posted 13 December 2004 - 11:01 AM

Check all the rubber hoses, one of them might have fallen off.

#3 Aksor


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Posted 20 December 2004 - 02:01 PM

spray some wd40 arround the intake and see if it starts to run better!

you might have a bad intake mainfold gasket.

#4 rjp98outlook


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Posted 20 December 2004 - 02:16 PM

Thanks, but it is fixed now. The problem was a bad IAC valve just like the diagnostic code suggested. I tried cleaning it well, and I also tested it electronically. Both opening and closing seemed to work perfectly. I even boiled it in a pot of water to make sure the temperature controlled mechanism closed as well. Everything looked good, but it was defective still. I found one at a junkyard and now it works perfect (good thing too, because this part lists for 328.00!). By the way, I purchased the entire intake setup including:

(1998 Subaru 2.5L)

Throttle body
TPS sensor
fuel injectors
coil pack
misc vacuum devices and hoses
Intake manifold.

All are for sale now for any reasonable offer.


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