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1990 3.9 fuel injection???

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  #11  
Old 11-09-2011 | 01:34 PM
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Update... I took it yesterday and had the fuel injectors cleaned. It ran perfectly all the way home, about 15miles, then last night when i attempted to leave for work at 11pm it was crap again. Now that it has warmed up and turned sunny outside it is running great again. I researched Map Sensors and it states that they work off of barometric pressure. Would that be why it seems to be weather related?
 
  #12  
Old 11-09-2011 | 01:47 PM
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You can test the MAP with a multimeter, and hand vac pump. Just google it to find out the details.
 
  #13  
Old 11-11-2011 | 10:09 AM
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So I looked up directions to check map sensor. I pulled it off and just checked voltages like it said. Everything seemed within spec or pretty close so I put it back together. It runs perfect again, must have been connection or bad seal on vacuum line. Thanks for the suggestions and all the help.
 
  #14  
Old 03-13-2012 | 11:26 AM
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So ok... It's the same problem all over again. I replaced the MAP sensor since thats where I stopped the last time and it made no difference. How would I know if I have a bad fuel injector? I notice the one on the passenger side seems to quit spraying fuel at times and obviously thats when it starts dying. Can they be checked?
 
  #15  
Old 03-21-2012 | 10:04 AM
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It was a bad injector. I just replaced it and now it runs great again.
 
  #16  
Old 03-22-2012 | 08:21 AM
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You did good to track it down. Glad you got it running good.
 




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