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maf sensor

Old Feb 26, 2010 | 06:00 AM
  #1  
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Unhappy maf sensor

ive got a 94 explorer with a 4.0 that has been sitting for a year with a bad intake gasket so the other day i put a new one on now it only runs fair with the maf unpluged ive changed the sensor but still the same i hope its a sensor some where and i dont have to put another gasket on allso the check engine light is not on unless i unplug the sensor any ideas thanks
 
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Old Feb 26, 2010 | 06:40 AM
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Sounds like you probably have a bad vacuum leak somewhere. Maybe you didn't get the intake air tubing installed correctly, the tubing has a crack in it, or you have some other vacuum leak. Have you checked all the vacuum hoses, PCV elbow, EGR valve, etc.?

-Rod
 
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Old Feb 28, 2010 | 02:38 PM
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Connect a smoke machine to the intake plenum, no more guessing....
 
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Old Mar 1, 2010 | 03:54 PM
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Spray a combustable (like WD-40) around the vacuum lines and the intake. The engine will rev up when you hit the leak.
 
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Old Mar 1, 2010 | 03:57 PM
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Originally Posted by DadNSonF350
Spray a combustable (like WD-40) around the vacuum lines and the intake. The engine will rev up when you hit the leak.
Only 50/50 that this will signal and only IF you hit the leak..
 
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Old Mar 1, 2010 | 04:01 PM
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Originally Posted by aquanaut20
Only 50/50 that this will signal and only IF you hit the leak..
If you don't have a smoke machine it beats chasing lines and gaskets until you lose your mind. Been there, maybe I still am. Pass the ether!!!
 
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Old Mar 3, 2010 | 10:43 AM
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Originally Posted by DadNSonF350
If you don't have a smoke machine it beats chasing lines and gaskets until you lose your mind. Been there, maybe I still am. Pass the ether!!!
Built my own smoker for $45.00.... works for the evap leaks that cant be found with ether!!!
 
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