1990 3.9 fuel injection???
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?
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.
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?


