Air pump running?
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Instructor
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From: Uxbridge Ontario
Air pump running?
I had the Vararam installed on my car then had it Dyno/road tuned. 2 days after when pulling into my garage I noticed my air pump was running? I thought this was only suppose to come on for a few minutes after start up. I went out a couple of hours after to start the car and the air pump did what it was suppose to and shut off after a few minutes. Any explanation why it would have been running after I had it out for a drive? Could it be reading the exhaust is to rich? I ahve no idea. This never happened before the Vararam and tuning.
It did not throw any codes either.
Thanks,
Rob
It did not throw any codes either.
Thanks,
Rob
Last edited by legalins; May 15, 2012 at 06:46 PM.
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St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Thread Starter
Instructor
Joined: Oct 2008
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From: Uxbridge Ontario
****, now I think it might have been the cooling fans. Will the Vararam make the cooling fans come on more often? It wasn't a hot day and the car was getting lots of air before i pulled into the garage.
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St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
You would be much less likely to hear the air pump running. It's fairly quiet, and should only be running for a short period after a cold start-up.
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From: Dyer, IN
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St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
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Mine cycles on at various times at idle yet it passes the tests and doesn't throw any codes. No pump codes are disabled either. A bunch of people on this forum will say this can't happen and something must wrong yet they have no input on what it could be or how to test it.
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St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Mine cycles on at various times at idle yet it passes the tests and doesn't throw any codes. No pump codes are disabled either. A bunch of people on this forum will say this can't happen and something must wrong yet they have no input on what it could be or how to test it.
The PCM monitors the pre-cat O2 sensor voltages in order to diagnose the AIR system.
A DTC will be set if: The AIR pump turns ON during closed loop operation and the O2 sensor voltage does not fall below 222 mV for 1.3 seconds.
Or
If the AIR pump turns ON during closed loop operation and the short-term fuel trim does not change more than a predetermined amount.
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From: South Western Ontario
A scan tool - HPTuners for example? Everything looks fine, yet it still often cycles at idle and not just after a cold start.
At the end of the day, it's really not something I can be bothered to worry about any further.
At the end of the day, it's really not something I can be bothered to worry about any further.
Tech Contributor
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St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
My AIR pump never runs after the initial start-up cycle is complete. I would be somewhat concerned if it cycled on and off after that period.
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It passes the tests and no codes. The computer is commanding it on. So, how would I fix it when nothing seems to be broken?
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St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Are you running a modified tune, or a stock tune?
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St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Have you confirmed that it was the cooling fans, and not the AIR system pump as you first thought?
