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'99 OBS V7 STi Swap
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Discussion Starter · #1 ·
So I have the most random issue going on with my motor. It's a ej20g top end with an 04/05 STi shortblock, 550cc inj, and power fc.


The car is stalling after driving around a bit after warm up. So starts up great and idles great. Drive around but during that first 10 min when I go into neutral coming up to a stop light the car will just die when I take it out of gear. Only happens during first 10-15 min of driving. Smells like lots of fuel after starting right back up.

Car pulls amazing and drives totally normal after first 10-15 min and doesn't do the stalling if I were to go park somewhere run errands and then start it back up. Basically only in the morning or after not driving for a long time. Could it just be my ecu map?

I have noticed that totally randomly sometimes the idle sitting will hunt from normal (850) down to around 3-400 up and down, up and down and eventually go back to sitting at 850.

Any ideas would be great. Sorry for the long post.

Thanks!
 

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'99 OBS V7 STi Swap
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850 Posts
Discussion Starter · #3 ·
It won't just turn off if I let it idle for 10-15. But if I let it idle 10-15 min before driving it, it will still stall once warmed up when i drive it for the first few times when I put it in neutral.
 

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This week: 2005 Legacy GT
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Did you reset your ECU lately?

Mine always does that for awile after resetting the ECU, or switching maps, but then it goes away.
 

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'99 OBS V7 STi Swap
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Discussion Starter · #6 ·
yeah i've re-initialized the ecu a few times. doesn't solve the problem.

i'm don't really know anything about cold start parameters and what they should be set at or even whats a normal setting. my buddy did the tune for his car before it went i transferred the engine and everything into my car.

any advice on what i should be looking for in the parameters?
 

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'99 OBS V7 STi Swap
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Discussion Starter · #8 ·
99rs - yeah almost exact same problem just doesn't happen all the time. plus the stall at the beginning of driving around. hmm.....

i have an extra MAF. i'll throw it in today see if it helps or changes anything.
 

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'99 OBS V7 STi Swap
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Discussion Starter · #10 ·
swapped MAFs out and the car runs a lil better. doesn't do the hunting idle anymore. only driven it a few times so can't totally confirm thats gone yet.

still stalls though on warm up ect... also noticed a nice stutter when tapping on the throttle....hmmmm

i'm wondering if it is just how the car is tuned for that area.....can do some logs but i wouldn't really know what to look for
 
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