Map sensor issues

1990Coupe · Jun 24, 2006

So im finally getting the car on the road. I had a couple of problems and pulled a couple of codes... One was the map sensor and EGR.. so i decided to go the easiest route (when the car is warm, if push in the clutch, it idles realllyyyy low, and most time dies) and replace the map sensor. so i picked up a used one from the mustang junkyard close by me, and when i went to install it, i noticed the one in there had a hose coming off the left side of it running to the vaccum tree? i thought map sensors didnt have this, so i installed the new one i got, and plugged the vac tree, now when i start it, it will revv to 1500 and die. then ill re-start it, it will revv and ill help it idle but she idles at like 400? is that line susposed to be hooked up to the map sensor??

ARTTII · Jun 24, 2006

are you running mass air or speed density?

xpeteyjtx · Jun 24, 2006

If you have mass air, you might need a different unit... or you may be able to use the speed density unit without the vacuum line (I am not sure). I also got a MAP code (I believe it was 33, but not sure). I purchased a new one from ford, $100-$150, installed it, and I don't think I noticed any difference in the way the car ran. I think I even drove the car without the MAP plugged in and it was fine.

TENGRAM · Jun 24, 2006

1986Stang said:
So im finally getting the car on the road. I had a couple of problems and pulled a couple of codes... One was the map sensor and EGR.. so i decided to go the easiest route (when the car is warm, if push in the clutch, it idles realllyyyy low, and most time dies) and replace the map sensor. so i picked up a used one from the mustang junkyard close by me, and when i went to install it, i noticed the one in there had a hose coming off the left side of it running to the vaccum tree? i thought map sensors didnt have this, so i installed the new one i got, and plugged the vac tree, now when i start it, it will revv to 1500 and die. then ill re-start it, it will revv and ill help it idle but she idles at like 400? is that line susposed to be hooked up to the map sensor??

i think it should be fine as long as you hook up the vacuum line. what you got was a BAP from a mass air car. your car came with a MAP but i think they are interchangeable

1990Coupe · Jun 25, 2006

The car is a mass air car. so pretty much i should hook the vac line back up off the tree?? Still i thought that map sensors didnt have a vac line coming off of them?

xpeteyjtx · Jun 25, 2006

I am pretty sure that Mass Air cars do not use the vacuum line. Mine doesn't and it is a 91. Whether or not the units are interchangeable though, I do not know. Just try it out and if you get the same code, then you know you have a problem. Make sure you reset the computer.

1990Coupe · Jun 25, 2006

Ok i pulled the codes and im not showing a map sensor anymore. and the engine light as gone off. I think that it didnt want to idle for me possibly because the codes had been cleared, i reset the ECU and with the heads, x cam and intake it was just re adjusting itself. seems to run fine when its all warmed up, ill let it cool and try to restart and see if i have any idle issues when cold. Thanks everyone!!

1990Coupe · Jun 27, 2006

so the car idles fine. the computer just had to relearn everything!

TENGRAM · Jul 1, 2006

Map sensor issues

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