Problem with starting and maintaining idle
Here is the problem I had, while driving at highway speed in the rain my JK cut out and died the ETC light along with the engine light came on. I pulled over and tried to restart and it did after pumping the gas and it wouldn't idle. I eventually got it to go but very erratic idle until I got it home. I checked the codes and this is what came up P0301 cylinder 1misfire, P1790 transmission control module checksum, P2172 high airflow vacuum leak. My jeep is a 2009 unlimited. What would anyone recommend I do to fix these issues?
Update, it will not idle I have apply full throttle to keep it going.
Thanks,
Update, it will not idle I have apply full throttle to keep it going.
Thanks,
Last edited by Biggs74; Sep 30, 2012 at 08:46 AM.
Here is the problem I had, while driving at highway speed in the rain my JK cut out and died the ETC light along with the engine light came on. I pulled over and tried to restart and it did after pumping the gas and it wouldn't idle. I eventually got it to go but very erratic idle until I got it home. I checked the codes and this is what came up P0301 cylinder 1misfire, P1790 transmission control module checksum, P2172 high airflow vacuum leak. My jeep is a 2009 unlimited. What would anyone recommend I do to fix these issues?
Update, it will not idle I have apply full throttle to keep it going.
Thanks,
Update, it will not idle I have apply full throttle to keep it going.
Thanks,
it sounds like a large vacuum leak , look under the hood at all your hoses and ck look close at your brake booster hose that could potentially be a large leak but seems you would have noticed braking issues a large leak will cause lean conditions which may be responsible for the misfire . the tranny reads vacuum to detect load and driving conditions , i think you got a hose or maybe a manifold leak. after checking a little online it appears your problem could be as simple as the map sensor
Last edited by carolinajk; Sep 30, 2012 at 11:21 AM.


