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  #1  
Old 12-07-2016, 05:40 PM
Scoobie Noobie
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Trenno at standard level
Default 99 wrx hesitates/surges when cold

Hi guys,

I've had my rex now for about a year and ice noticed is getting progressively worse to drive when cold. The CEL (knock sensor code) comes on upon startup and stays on until the car is about a quarter up the temp guage. The light also comes on intermittently when at operating temp.

When it's cold and accelerating, it surges back and forth gently. The afm, plugs, leads, air filter are all about 12 months old.

Any ideas? I thought maybe injectors or even the afm is playing up again?
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Old 12-07-2016, 06:46 PM
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If knock sensor CEL is coming up would it not be the knock sensor?
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  #3  
Old 12-07-2016, 07:13 PM
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I didn't think so because the knock sensor fault came up when the afm shat itself.

There's a cheap "genuine jecs" knock sensor on ebay, maybe I'll grab that and try it out

Any other thoughts people?
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Old 12-07-2016, 07:20 PM
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O2 sensor
AFM
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  #5  
Old 19-07-2016, 08:47 PM
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Cheers, will give them a try. ��
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