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Have a 108 code show up on a 1999 sunfire what might the problem be

It runs rough and smokes black

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Potential causes of a P0108 code:

  • Bad MAP sensor
  • Leak in vacuum supply line to MAP sensor
  • Engine vacuum leak
  • Short on signal wire to PCM
  • Short on reference voltage wire from PCM
  • Open in ground circuit to MAP
  • Worn engine causing low vacuum

got from here

Posted on Dec 08, 2012


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Posted on Jan 02, 2017

  • 116 Answers

SOURCE: running rich and blowing black smoke

try replaceing the oxygen sensor

Posted on Dec 10, 2008

  • 141 Answers

SOURCE: Po 108 fault code

Sounds more like a mass air flow sensor problem.

Posted on Jan 09, 2009

  • 123 Answers

SOURCE: 2001 Dodge 1500 4x4 fault code PO 108

If you don't find that vacuum leak,( which is a common cause too) look with a scan tool at the reading on reported intake air temperature sensor. It should be within 10 Deg of your ambient temperature.
An air temperature sensor fault can cause flooding/starving of the engine. Some of the ones I've seen will report temperatures over 50F higher than the normal air temperature and fluctuate rapidly. Such a jump really affects how the computer calculates the mixture.

hope that helps some...

Posted on Jan 13, 2009

  • 9 Answers

SOURCE: runs rough, black smoke, computer bank 1 burning too lean

Sounds like bad injectors, bad O2 sensors, and or too much fuel psi. Check the fuel psi against what the service manual says. If the fuel psi is too high, your regulator is bad. If the fuel psi checks out ok, you likely have a bad O2 or bad fuel injector(s).

Posted on Apr 15, 2009

  • 5537 Answers

SOURCE: 02dodge ram ,running rough, black smoke out exhaust

Take it to an Autozone or O'Reillys and they will test the computer for you. It should have set a code, but you don't know if the code light works so its your best bet. Sounds like it is running rich and the crankshaft module is not advancing the timing.

Posted on May 11, 2009

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