Question about 2002 Subaru Impreza
I have a turbo back exhaust on the car i also replaced all the vac lines so i would eliminate and leaks origanaly i had all 4 cylinder misfire codes as well with the wastegate selonoid A range performance code , then i checked and replaces all the plugs and reset the computer and all the codes were gone then after a spirtied run the cel cam back with only the wastegate code,, now what
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Posted on Jan 02, 2017
What you should check first is the spark plug for the #1 cylinder and see if there is a white film on it this would be a sign of a coolant leak which would cause a problem with the O2 sensor
Posted on Oct 11, 2008
How does the oil look? Is it milky or is there any discoloration? Is any moisture or steam vapor coming out of the exhaust pipe? The EGR fault is most likely being triggered from the cylinder missfire. Sounds like you might have a head gasket blown, and/or a cracked or warped cylinder head from the overheating.
You can run a compression test to help determine this.
Good luck...i hope this helps you troubleshoot the problem.
Posted on May 09, 2009
this is a coolant performance code. Usuallly sets this code if the connector was left unhooked to the coolant sensor or the thremostat is stuck open. By any chance do you have a gauge that seems to be on the cold side ??
Posted on Nov 30, 2009
SOURCE: 1998 subaru rs impreza 2.5
Usually a vacuum leak will make the idle bog down rather than speed up, even if the ECU is compensating. It will be rough, but as you say, it's fine through the revs.
This leads me to think the PCV (postive crankcase valve) is not connected or is leaking. This raises the idle, although the ECU will suspect the IAC to be the problem. Check the PCV valve first.
Check the MAF sensor for dirt too.
Another point to make is the throttle body might be clogged/dirty. Get the intake manifold off again and clean it with petrol/carb cleaner and a toothbrush, check the condition of the rubber seals, if they are gunked up, the air speed will increase, causing a high idle. Check the exhaust manifolds for any build up/rust.
Finally, when were the O2 sensors last changed? If recently, are they the right way around? If not recently, try those, but make this the last resort as they can cost a lot.
I hope I have covered every eventuality as I can see how annoying this is for you. As you already mentioned, reset the ECu after each attempt.
Good luck, fire any questions back if you need.
Posted on Jul 18, 2010
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