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Old 05-29-2008, 09:17 PM   #1
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Check Engine Light on, FUEL TRIM reading

Hello,

My check engine light is on and I went to my Porsche Mechanic and he checked it and said it was the fuel trim. He says it can be anything from O2 sensor to vacuum leaks. What is fuel trim exactly? and what can it be? I have a 2002 Boxster 2.7 90km. Also sometimes right before redline it feels like the fuel cuts out like the engine shuts off for a split second. Does this have anything to do with the "fuel trim"?

Thanks in advance for your help.

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Old 05-30-2008, 06:15 AM   #2
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Never heard of this one. Did you test or replace the gas cap. Interestingly, that can cause a CEL.

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Old 05-30-2008, 07:06 AM   #3
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What are the error codes. Just shooting in the dark at this point.
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Old 05-30-2008, 02:51 PM   #4
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I was told it was fuel trim reading thats all he said and made an appointment to get it checked out he said it would take a few hours. If no one heard about this then im thinking twice about this guy
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Old 05-31-2008, 09:16 PM   #5
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Quote:
Originally Posted by yellowboxster
Hello,

sometimes right before redline it feels like the fuel cuts out like the engine shuts off for a split second. Does this have anything to do with the "fuel trim"?

Thanks in advance for your help.
Sounds like you are hitting the rev limiter. BTW this gets logged in the DME.
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Old 06-01-2008, 09:09 PM   #6
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Sorry, what is DME and what does it do?
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Old 06-02-2008, 04:08 PM   #7
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It's the car's brain.....

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