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Old 06-23-2010, 09:29 AM   #1
Paraskass
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Join Date: Jan 2004
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2006 2.5i
Steel Gray

Default Diagnose my problem please

2006 Impreza 2.5i
Nearing 60k miles

Car runs fine, but the engine started bucking this morning when I reached 4k to 4.5k RPMs during acceleration. It felt like hitting the rev limiter, but at lower RPMs.

The check engine light came on, and flashed for a few seconds. It went away when the RPMs got lower. The car is now parked and I will book an appointment with my dealership.

In the meantime, can anybody help me diagnose my problem?
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Old 06-23-2010, 10:28 AM   #2
dcleal
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A flashing check engine light indicates a severe misfire that will damage the cat. Your first step should be to go to auto zone and get them to pull the codes for free. Make sure you get the code so we can see it exactly. It is most likely fuel or spark related. What is the service history of the vehicle?
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Old 06-23-2010, 11:16 AM   #3
cmiovino
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Yep, flashing CEL is a misfire. I personally wouldn't call it 'severe' though.

Basically, you could start the car up now and everything will be fine. The CEL will still be on, but not flashing. Take it to autozone/advance and pull the code, write it down, and clear it from the ECU. Drive home and everything should be fine. It happened to my old '95 about once a year and was never a big problem.

I'd check your spark plugs and wires just to make sure everything is in good working order. I wouldn't freak out about it though... when it happens you feel like your car is going to explode, but you're really fine. Just pull off the road ASAP if it starts happening and turn it off.
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Old 06-23-2010, 11:19 AM   #4
Paraskass
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Quote:
Originally Posted by dcleal View Post
A flashing check engine light indicates a severe misfire that will damage the cat. Your first step should be to go to auto zone and get them to pull the codes for free. Make sure you get the code so we can see it exactly. It is most likely fuel or spark related. What is the service history of the vehicle?
I've owned the car since day one.

It's been pretty much problem free. There were 2 times when I was late on oil changes, nothing major.

It's nearing warranty now and this happened.

The check engine light blinked a total of maybe 5-6 times before dissapearing. The car feels normal under 4k rpm.
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Old 06-23-2010, 11:30 AM   #5
PhilSine
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98 OBS-T, 91 Legacy SS

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Your ECU is in safe mode which is why it won't rev past 4500 RPMs. Like dcleal said; the flashing CEL is an indication of misfires. Definately get the cose read and report back. could have a bad knock sensor or something like that but you won't know until the code is read.
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Old 06-23-2010, 11:35 AM   #6
Paraskass
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They have me booked for Friday morning...

Any danger driving the car home today (about a 3 mile drive, and I can take it slow)?
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Old 06-23-2010, 04:41 PM   #7
dcleal
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If it is driving fine and the check engine light is not on than you can drive it. Apparently the problem is only during high RPM so just try to avoid that rpm range. Have you ever had the spark plugs changed or fuel filter replaced? The spark plugs are recommended every 30,000 miles and the fuel filter is recommended at 60,000 miles.
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Old 06-23-2010, 11:47 PM   #8
The G.O.A.T.
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and where is this fuel filter located???
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Old 06-23-2010, 11:54 PM   #9
kewlboxer2
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fuel filter is not replaceable on the 06-07 2.5i. its directly on the pump in the tank.
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Old 06-24-2010, 10:23 AM   #10
The G.O.A.T.
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That is what I thought, is it like the gm one where it is on the bottom and if you are 1/2 full or more the fuel is unfiltered???
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Old 06-24-2010, 10:57 AM   #11
BKscooby
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Pull the code, and we'll be able to help. Otherwise it just keeps me guessing that it is a bad coil or or a plug.
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Old 06-24-2010, 11:33 AM   #12
Paraskass
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Spark plugs never changed.

I will find out tomorrow morning.
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Old 06-24-2010, 06:16 PM   #13
dcleal
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although the filter is on the fuel pump it is still recommended that it is replaced every 60,000 miles. The labor time is only .5 hour so it can't be that hard.
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