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Old 07-15-2013, 05:25 AM   #1
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Join Date: Apr 2013
Location: Toronto
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sudden power loss under heavy load

Hi - hoping to find some help on this one. I've been experiencing sudden power loss intermittently when under high load 5000-6000 RPM range. Engine doesn't quit, just loses power and throttle response. killing and restarting the ignition fixes the problem for the time being.
it does produce an error code of p1508 and while everything seems to point to the MAF, after replacing it, it still happens.

Thoughts? suggestions?

Thanks in advance.


paulneto is offline   Reply With Quote
Old 07-15-2013, 12:01 PM   #2
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I believe that p1508 is 'torque comparison function monitor- signal implausible': typically MAF sensor faulty or DME control monitor faulty. Since you have replaced the MAF sensor (I assume with the correct part), then one suspects it is the DME module. Alternatively, are you certain the connections are all good on the MAF? Did the throttle body require any serious cleaning prior to installation as that may have affected the contacts.

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Old 07-15-2013, 12:11 PM   #3
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I'd take it to a shop. That code means that the DME is confused.

They will need to check the throttle position sensor, throttle jacking sensor, engine position sensor, and the DME for possible failure along with all of the associated wiring and connectors.

1999 996 C2 - sold - bought back - sold for more
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Last edited by thstone; 07-15-2013 at 12:13 PM.
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