carfreak85 Posted May 19, 2016 Share Posted May 19, 2016 About two weeks ago my WRX started stalling the engine when I would push in the clutch and shift to neutral as I came to a stop. It seems like as the engine comes up to temperature, it looses its ability to keep the engine at idle. Eventually I have to hold the throttle cracked open at idle to keep it running. If I coast, in gear, up to a stop and disengage the clutch just as engine RPM reaches hot-idle, I can keep it running, no problem. But if I come to a stop quickly and push in the clutch, the engine will immediately stall. There is NO high idle, only a gradual reduction of idle speed as the engine warms up. I haven't done much fiddling lately, besides replacing the MAF and front O2 sensors. I'm also not getting ANY OBD fault codes. Doing some research pointed to the IACV being gummed up. So I cleaned it, per the instructions on NASIOC. My drive to work involves about two miles of surface streets until I get to the freeway onramp, then about 8 miles of highway. There are three stop signs between my house and the freeway and about as many between the freeway offramp and my work. The car started pretty normal the next morning, but each time I stopped at a stop sign the idle would get lower and lower until the engine stalled as I pulled up to the stoplight at the onramp. Same story after driving on the highway, when I pulled up to a stop after exiting, the engine stalled. Some further reading of the IACV-cleaning post on NASIOC revealed that disassembly of the IACV could yield better cleaning results, but often the cleaned valve would fail within the next few months or years. I decided to just bite the bullet and replace the IACV with a new one. Same story. The engine started fine, but with each stop sign between my house and the freeway onramp, the engine would idle lower and lower until it stalled at the onramp. After the IACV, most folks suggest checking for vacuum leaks. I haven't done this yet, but I'm very doubtful that there are any. I haven't taken anything apart recently, save the new sensors, and the car was running perfectly normally up until two weeks ago. I plan to do some data logging tomorrow on my way to and from work, and will post the results here. So, anyone have any ideas? Fuel pump? Fuel pump relay? Bueller? Bueller? Bueller? Quote Link to comment Share on other sites More sharing options...
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