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1990 3.9 fuel injection???

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Old Nov 9, 2011 | 12:34 PM
  #11  
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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?
 
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Old Nov 9, 2011 | 12:47 PM
  #12  
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You can test the MAP with a multimeter, and hand vac pump. Just google it to find out the details.
 
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Old Nov 11, 2011 | 09:09 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.
 
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Old Mar 13, 2012 | 10:26 AM
  #14  
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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?
 
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Old Mar 21, 2012 | 09:04 AM
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It was a bad injector. I just replaced it and now it runs great again.
 
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Old Mar 22, 2012 | 07:21 AM
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You did good to track it down. Glad you got it running good.
 
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