MudfrogK5
NAXJA Forum User
- Location
- Roanoke VA
Ok, I was having issues with my 90 cherokee (4.0L) stalling after first starting and figured out the fix was to clean the TB (idle was fine). At the same time I sprayed some TB cleaner on the IAC. Put everything back together and now I have a high idle. The only thing that comes to mind is the vacuum line coming from the MAP sensor. I could not for the life of me get the figure 8 gromet pushed all the way in to the TB. It's about 1/2 - 3/4 of the way in and it's tight so it's not loose. Anyway, today I pulled the IAC and completely cleaned it and I still have a high idle. I tried unplugging the IAC, the first time the idle dropped down, then went back up after plugging it back in. The second time it made no difference in the idle, was still idling high.
If I unplug the vacuum line from the MAP sensor the idle will significantly drop, almost to the point of stalling. Would this indicate a bad MAP sensor? The only vacuum leak I have found is where the EGR valve's nipple snapped off so the hose will not stay on. I have tried closing the line and holding the vacuum line to the EGR valve and this made no difference.
Help would be greatly appreciated. Oh I did see on LungHD about testing the MAP sensor but to be honest my voltmeter has so many settings I don't have a clue which one to use lol.
If I unplug the vacuum line from the MAP sensor the idle will significantly drop, almost to the point of stalling. Would this indicate a bad MAP sensor? The only vacuum leak I have found is where the EGR valve's nipple snapped off so the hose will not stay on. I have tried closing the line and holding the vacuum line to the EGR valve and this made no difference.
Help would be greatly appreciated. Oh I did see on LungHD about testing the MAP sensor but to be honest my voltmeter has so many settings I don't have a clue which one to use lol.