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Old 04-28-2009, 09:31 AM   #1
furryfootstool
Scooby Specialist
 
Member#: 200526
Join Date: Jan 2009
Chapter/Region: SWIC
Location: Queen Creek
Default Possible ECU issue

I was left high and dry on my 02 wrx cause it was flashed with the ecutek software. I couldn't find another 02 wrx ecu so I picked up an 04 ecu instead. plugged right in and was tuned open source. things ran fine for a while then I started getting p0304 just about everyday now. I've done compression test, both hot and cold, but not a leak down test. the reason I didn't do that yet was cause I only get that code when the engine is cold(sitting for a while). Once the car is warm, no codes or idle issues. she runs just fine, only when its cold the problem is there. I tried the coil pack swap, the injector swap, cleaned the maf, new fuel pump and filter and check all the grounds. For a while I thought I had a vacuum leak, but I haven't been able to find any yet. I am stumped.... is it possible its the ecu doing this? I'm trying to find out if I need a new 02 ecu or not
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