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DigDug 08-20-2013 12:45 PM

Low idle after I/C removal
Hi guys.

I have an '05 Impreza WRX and had to swop out the starter. Obviously I had to remove the I/C to get in there and after I put everything together, took it for a test ride. All seemed fine until I came to a complete stop only to find the idling to be very low, almost stalling.

When I got home I checked that the clamps were tight and started her up again. The idle was a little low to start off with and then seemed to level out at normal idle after a few blips on the throttle. I'll have to check tomorrow on the way to work.

Any ideas why I would have this problem after the I/C removal?

man show 08-20-2013 01:55 PM

Did you disconnect your battery while you were working on the car? If so, your ECU might have been reset and it might have to relearn a few parameters before it functions completely normally again. I had similar symptoms right after I cleaned/oiled my air filter and reset my ECU with my Cobb AP, except my car actually stalled when it sat there idling unless I gave it a little gas. After driving it for a couple of minutes though, everything went back to normal. Try giving it a day or so and see what happens.

turmic 08-20-2013 03:41 PM

It could be what John said...if you disconnected the battery, The ECU will have to relearn the realtime map parameters. It'll fix its self after a couple minutes or some driving.

DigDug 08-21-2013 12:09 AM

The battery was disconnected for a whole day while I was busy. I took it for a short drive yesterday so when I get back from work today I'll go for another drive. Hopefully it will steady out otherwise I'll be pulling the I/C off again to double check the pipes and clamps. Decided not to drive her to work today.

On another note I really want to get rid of the BOV that's on the car now. Is the Perrin recirculating valve worth the $$?

Thanks for the help guys.

Subaruonlineparts 08-21-2013 02:46 PM

A recirculating valve like Perrin's will keep the MAF readings more stable as the ECU expects this as it was originally designed. This comes more into play during parking lot maneuvers, reversing etc. It will not effect your idle issue however


turmic 08-21-2013 05:36 PM

There are better BPVs then Perrin's btw.

DigDug 08-22-2013 12:40 AM

I got the car all sorted yesterday. The ECU needed to learn it's way again. I found a post on nasioc that helped. Seems to be a common problem if the battery is off for more than a few minutes.

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