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Old 06-06-2005, 09:35 AM   #1
Scooby Newbie
Member#: 84082
Join Date: Mar 2005
Default Bad Idle

Over this weekend I attempted to reset the ECU on my 99 subaru Legacy. During this morning drive to work the idle seems to have gotten worse and the car seemed to almost want to die down and then pick up the rpm. It had one big pulse down but then would even out and smothen. I wonder what the issue might be here.
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Kensubguy is offline   Reply With Quote
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Old 06-06-2005, 07:41 PM   #2
Scooby Specialist
Member#: 82431
Join Date: Mar 2005
Chapter/Region: NWIC
Location: Battle Ground, WA
2006 06 wrx limited



There are tons of things that could be going on here.

It could be:
coolant temperature sensor
bad injector
Dirty MAF
Really dirty air filter
bad egr valve/sensor
Throttle position sensor.

First try to answer the following.
Are you throwing a CEL?
Does it start hard?
Does it do it when warm?
Does is accelerate poorly?

This is a common and tricky problem. I have learned a lot from this forum. Look around and see what you come up with.
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Old 06-06-2005, 07:54 PM   #3
Scooby Guru
Member#: 5851
Join Date: Apr 2001
Chapter/Region: VIC
Location: Vancouver
17 Ford Escape SE


Keep driving it, my guess is it will sort itself out as the ECU is re-learning.
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Old 06-07-2005, 10:51 AM   #4
Scooby Newbie
Member#: 84082
Join Date: Mar 2005

The Idle has smoothed out but I am having a hard time going up hills now. Today I could not get to 40 mph which I normaly does. I have a persistent CEL and been planning for 2 weeks now to change the oxygen sensor and the knock sensor. I had a code on knock, fuel/air metering and idle sensor malfunction.
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Old 06-07-2005, 10:45 PM   #5
Scooby Newbie
Member#: 58806
Join Date: Apr 2004
Location: New york
1998 RIP Legacy2.5GT
2.2L legacy wagon


Im not tryin to steal the thread but im having hesitation while accellerating in 2nd and 3rd gear at like 3500 rpms ... any suggestions( replaced the wires and coilpack )..

thanx main
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