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Old 09-02-2008, 12:40 PM   #1
johnpaul76
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Member#: 71075
Join Date: Sep 2004
Location: Northern New Jersey
Vehicle:
1998 Impreza RSTi
Faded Rally Blue

Default EJ207 Swap: After startup, strange idle

Swapped a JDM STi V7 motor into 1998 2.5RS. The engine starts up fine, but after it runs for about 20 seconds, it begins to idle strangely. It idles at about 1200 RPM and creeps up a little, then seems to cut the fuel. It repeats this over and over.

If you put your finger between the maf and the flex pipe (allowing air to bypass the maf), it seems to idle normally.

I do not have a fuel pump controller (yet), so the fuel pump is wired to be full on.

Here is a video of it running.
http://www.s-ca.com/temp_pics/subaru/day6/MVI_3470.AVI

Additional details:
Model: GDBA4EH
Engine: EJ207DW3CR

Thanks a lot,
John
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Old 09-02-2008, 03:01 PM   #2
parkes
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Join Date: Dec 2007
Chapter/Region: W. Canada
Location: Canada
Vehicle:
1994 T leg SS
ABM

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SOunds like you know your problems, Do what you can and see what happens!
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Old 09-02-2008, 05:14 PM   #3
johnpaul76
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1998 Impreza RSTi
Faded Rally Blue

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Does it seem like the MAF is bad? It was open to the elements for a while.
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Old 09-03-2008, 08:29 AM   #4
Zephyr
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Location: On the Podium w/ a trophy girl
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1985 I've wired a
Few cars in my day

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This is not caused by lack of fuel pump controller. Make sure your MAF is positioned correctly in the tube. The plug should be facing the front of the car.

Z
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Old 09-03-2008, 01:22 PM   #5
parkes
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ABM

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possibly yes..

But wont the IAC be sucking in air on idle anyways
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Old 09-05-2008, 01:16 AM   #6
StupidFastWagon
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2014 335i xDrive
M Sport

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My buddies car did this, we had to replace the TB and it worked :P
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Old 09-07-2008, 03:49 AM   #7
REDI-wgn
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03 WRX Wagon

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Try cleaning the IAC. Never seen a bad MAF do that, however im sure its possible.
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Old 09-07-2008, 11:04 AM   #8
johnpaul76
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Join Date: Sep 2004
Location: Northern New Jersey
Vehicle:
1998 Impreza RSTi
Faded Rally Blue

Default

Thanks a lot for all the replies.

It turned out that either the throttle cable was not adjusted properly, or the throttle body was stuck. For some reason, after we started the car again, the engine started racing to 5,000 rpm, instead of the previous behavior. That's when we looked at the cable and adjusted it. After that, it idled great for about 30-45 minutes.
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