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Hesitation when accelerating.
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Old 29 Sep 2012, 08:40 PM   #1 (permalink)
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Hesitation when accelerating.

Hello guys. I picked up my second Impreza ( A ''w'' reg uk turbo wagon) the other day.
And today when I started her up the engine check light came on and stayed on untill the car reached temperature, after a few miles of driving it went out! The car was very hesitant when accelerating whilst the light was on and a little noticable after it had gone out! I can only describe it as if I was purposely lifting my foot up and down on the accelerator at regular intervals as I was getting up to speed. A mechanic I took it to plugged it in and came up with no codes he then said it could be the knock sensor. But I thought I'd ask on here for some advice, or if some one could point me in the right direction of a link or what have you that would be great. Best regards Ben.
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Old 29 Sep 2012, 10:32 PM   #2 (permalink)
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Re: Hesitation when accelerating.

read the error code and report back, it will or may help point towards any issues.
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Old 30 Sep 2012, 06:40 PM   #3 (permalink)
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Re: Hesitation when accelerating.

Sorry for the delay. And thanks for the reply. How do you mean read the fault codes Bob? I took it to a garage and they plugged it in and there was nothing!!! Is there a way of reading them yourself etc? Keep any advice coming guys.

Best regards Ben.
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Old 30 Sep 2012, 08:54 PM   #4 (permalink)
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Re: Hesitation when accelerating.

google impreza error code reading there are some green and black connectors under the dash you can use to self diagnose error codes.
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Old 02 Oct 2012, 06:06 PM   #5 (permalink)
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Re: Hesitation when accelerating.

Sorry for the delay Bob, been mega busy. I did the surprisingly easy
self diagnostic test today. And had 2 long flashes, and 2 short flashes.
Which if I'm correct is fault code 22 knock sensor. I've ordered a sensor
Part number: 22060AA070. Which I'm sure is correct. And I'm going to fit
as soon as it arrives. Has any one fitted one to there own car? I've got a
manual for 97-98 Impreza, as I couldn't find one specific for the 1999/2000MY.
Would the procedure for knock sensor removal and fitting be the same? or
Were there any differences to the fitting etc for the 1999/2000MY?
Again any advice or tips for fitting etc would be much appreciated

Best regards Ben.
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Old 02 Oct 2012, 10:36 PM   #6 (permalink)
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Re: Hesitation when accelerating.

will be a straight forward swap bud...just remember to reset the ECU once you have the new unit in place..
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Old 03 Oct 2012, 06:50 PM   #7 (permalink)
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Re: Hesitation when accelerating.

Cheer's pilot. Does it need to sit in any particular position? I was told it needed to sit
at a 60 degree angle to something! (that was the words he used) And I cant find anything
that say's so. And also is there any particular torque figure that the bolt needs to be
tightened to? Again I can't find any figures, I must not be looking correctly!

Thanks again guys for the help.
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Old 03 Oct 2012, 07:47 PM   #8 (permalink)
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Re: Hesitation when accelerating.

no need for any positions,just swap the componant...just nip it up and job done
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Old 03 Oct 2012, 08:02 PM   #9 (permalink)
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Re: Hesitation when accelerating.

Cheers pilot. Can't wait for the part to come now, I can finally get out and enjoy my car!!!
What to do with my old WRX is the new question!? Track/hill climb or rally car me thinks.
Or maybe all three lol.

Cheers again.
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Old 03 Oct 2012, 08:24 PM   #10 (permalink)
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Re: Hesitation when accelerating.

nothing like a multipurpose motor bud
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Old 04 Oct 2012, 09:25 PM   #11 (permalink)
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Re: Hesitation when accelerating.

Indeed, thought we wont be stripping and track prep-ping her until over Christmas.
Fitted part today, no where as easy as it seemed in the manual, but thanks to a mate we got there. And after a lengthy drive and some fine roads in my area all seems to be ok!!!
So hopefully that's "Knocked" that on the head haha. Thanks again for the help.

Ben.
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