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09-02-2008, 12:40 PM | #1 |
Scooby Newbie
Member#: 71075
Join Date: Sep 2004
Location: Northern New Jersey
Vehicle:1998 Impreza RSTi Faded Rally Blue |
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 |
09-02-2008, 03:01 PM | #2 |
Scooby Specialist
Member#: 166898
Join Date: Dec 2007
Chapter/Region:
W. Canada
Location: Canada
Vehicle:1994 T leg SS ABM |
SOunds like you know your problems, Do what you can and see what happens!
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09-02-2008, 05:14 PM | #3 |
Scooby Newbie
Member#: 71075
Join Date: Sep 2004
Location: Northern New Jersey
Vehicle:1998 Impreza RSTi Faded Rally Blue |
Does it seem like the MAF is bad? It was open to the elements for a while.
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09-03-2008, 08:29 AM | #4 |
Scooby Specialist
Member#: 3362
Join Date: Dec 2000
Location: Central NJ
Vehicle:2001 I've wired a Few cars in my day |
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 |
09-03-2008, 01:22 PM | #5 |
Scooby Specialist
Member#: 166898
Join Date: Dec 2007
Chapter/Region:
W. Canada
Location: Canada
Vehicle:1994 T leg SS ABM |
possibly yes..
But wont the IAC be sucking in air on idle anyways |
09-05-2008, 01:16 AM | #6 |
Scooby Specialist
Member#: 157526
Join Date: Aug 2007
Chapter/Region:
RMIC
Vehicle:2020 Sierra 1500 AT4 Silver |
My buddies car did this, we had to replace the TB and it worked :P
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09-07-2008, 03:49 AM | #7 |
Scooby Specialist
Member#: 38068
Join Date: Jun 2003
Chapter/Region:
South East
Location: Miami FL
Vehicle:03 WRX Wagon |
Try cleaning the IAC. Never seen a bad MAF do that, however im sure its possible.
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09-07-2008, 11:04 AM | #8 |
Scooby Newbie
Member#: 71075
Join Date: Sep 2004
Location: Northern New Jersey
Vehicle:1998 Impreza RSTi Faded Rally Blue |
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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