DTM Brian Posted April 30, 2003 Report Share Posted April 30, 2003 I have had a hesitation from 3500 rpm's up for a long time. I unplugged the mass air meter for shits and giggles and the car runs a TON better. No check engine light either. How can this be? Quote Link to comment Share on other sites More sharing options...
slow4now Posted April 30, 2003 Report Share Posted April 30, 2003 Very strange. Most cars are lucky to idle with the MAFS unplugged. Quote Link to comment Share on other sites More sharing options...
Nitrousbird Posted April 30, 2003 Report Share Posted April 30, 2003 Every car is different....and it's all about the PCM. Some have better "speed density" tables than others, because that's what the car's forced into. And some trip lights for it, others won't. Obviously, you either have a bad MAF sensor, or some bad wiring. Quote Link to comment Share on other sites More sharing options...
Guest nevarmore Posted April 30, 2003 Report Share Posted April 30, 2003 is it possible that it stops getting a signal from the MAF and is just running rich? Quote Link to comment Share on other sites More sharing options...
recklessOP Posted April 30, 2003 Report Share Posted April 30, 2003 my mustang runs with it unplugged. seems to idle fine, but it hesitates pretty bad tipping in the throttle, and runs rich as hell through the rev range. definitely trips the check engine light too. strange... Quote Link to comment Share on other sites More sharing options...
Guest stevil Posted May 1, 2003 Report Share Posted May 1, 2003 I've unplugged mine before, runs fine because the car switches to "speed density mode" like Joe said, it just uses the MAP and O2 sensors, no MAF. Maybe the MAF is messed up, or dirty. Try some electronics cleaner on the sensor wire, that may fix it. Otherwise, I'd just leave it unplugged if it runs good. Quote Link to comment Share on other sites More sharing options...
Lustalbert Posted May 1, 2003 Report Share Posted May 1, 2003 Originally posted by John Milner: I've unplugged mine before, runs fine because the car switches to "speed density mode" like Joe said, it just uses the MAP and O2 sensors, no MAF. Maybe the MAF is messed up, or dirty. Try some electronics cleaner on the sensor wire, that may fix it. Otherwise, I'd just leave it unplugged if it runs good. hey, if it wrks, roll with it Quote Link to comment Share on other sites More sharing options...
93_ChargedCobra_342 Posted May 1, 2003 Report Share Posted May 1, 2003 Originally posted by 'No Boost For You': my mustang runs with it unplugged. seems to idle fine, but it hesitates pretty bad tipping in the throttle, and runs rich as hell through the rev range. definitely trips the check engine light too. strange... Its going into a "limp" mode. Its running off of extra safe tables. Tables only, someone mentioned ir runs off map and o2. On MAF the there is no MAP sensor its a BAP (Barometric air pressure) Brian to answer your question, look for a vacuum leak. I had a Tunderbird that ran excellent with maf unpluged, turned out to be a intake gasket leak. The headers got red too. (in this case indicating the lean condition) Quote Link to comment Share on other sites More sharing options...
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