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Old 03-13-2013, 09:05 PM   #1
slownlow43
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01 GAGT surging

I just purchased an 01 GAGT that I'm having an issue with. Once it's warm the RPM's like to surge similar to a slipping transmission, especially under moderate to heavy acceleration.

I was having issues with it starting once warm, so I cleaned the MAF and that helped with the hard starting and some of the surging. Still very noticeable in 2nd gear though. I do have an SES light, but it's only throwing a P0420 which I doubt is related to this issue.

Any other recommendations for places to look?
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Old 03-14-2013, 01:04 AM   #2
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surging how? does the rpms bounce up and down? and do you feel/hear the car go vroom vroom vroom.

mine did that. almost 100% sure it was a torque converter.
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Old 03-14-2013, 07:08 AM   #3
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The surging kind of feels like a lag-surge-lag-surge-lag-surge, and each lag surge cycle takes about 2 seconds. When it surges it will jump about 500 RPM's. Is this something the upstream O2 sensor would affect, or should I try and find someone with a scantool to take a look at the transmission?

Edit: And I can feel the car accelerate noticeably with each surge. Each cycle feels similar to turbo lag then boost.
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Old 03-15-2013, 10:47 AM   #4
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Old 03-15-2013, 08:34 PM   #5
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I'm not getting a code for it, but it's cheap enough to just throw at the car and see what happens. Thanks man.
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Old 03-16-2013, 09:32 PM   #6
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yep, good luck.
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Old 03-17-2013, 05:16 AM   #7
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According to Alldata, that DTC is either bad O2 sensors or a clogged Catalytic converter.
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Old 03-17-2013, 08:04 PM   #8
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