EJ22 swap with hunting idle

[subynut]

Greetings great Subaru world!

 

I've finished an EJ swap in me 86 wagon and have a few issues. First, I must say: TORQUE is addicting.

I've got an EJ22 from a 92 Legacy 2WD AT. My wagon has a 5sp. When I first start up when cold, it idles at 2600RPM for about a minute then slowly begins to drop as it warms up. By the time it gets to 190deg, it's idling at ~800rpm. When I flick the throttle, it jumps to someware around 2000 and after 30 seconds it's back down where it belongs. If I start it when warm it hunts for a idle for about 15 seconds and then settles back down again. During driving, I have a hiccup when I get off the throttle, but not when I get on it.

 

Checked codes: Nothing.

I have replaced the CTS - (would idle at 2500 till 190deg, then suddenly drop to ~900 with the old cts);

O2 sesor is used, but was clean when I checked it during the swappage;

Checked the tps: range is smooth, idle switch is within range.

 

I have played with the IAC valve and I can get it to idle where it belongs and have no hesitation during on/off throttle UNTIL I shut her off - then she's back at it again with the high idle and hessitation on/off throttle.

 

I do have a spare maf I may try swapping to see if that makes any differnece.

 

Any ideas?

 

Thanks,

Ted

[Numbchux]

did you ground the AT/MT identification pin (pin 20 on B48)?

 

sounds like it still thinks it's hooked up to an AT.

[dhise]

Like Chux said, I recently cured a high cold start idle by grounding the pin that tells the ecu whether or not it is an at or mt trans. This was a '96 obdII ej22 and it was throwing a 1702 code because it was looking for an auto trans.

 

Once the ecu knew it was a manual tranny the cold idle started working as it should.

[subynut]

I think I may have just clipped that wire.:-\ Oops. I forget what I did on my brother's EJ swap.

 

Here's an intristing piece of info: If I disconnect just the MAF, it stalls. If I disconnect anything else, it would sit at about 1700. What's funny is my Sportage doesn't do that or the SPFI swaps I've done. I might try that on the Outback and see if it does that too. Always intristing when you start pulling sensors and watch how the ecu compensates.

 

I'll go dig out the ecu and ground that wire: pin 20 on B48

 

Thanks guys,

Ted