04 Liberty 3.7 2WD, Really rough idle cold

Ed McMeans · Dec 29, 2019

Would bad motor mounts possibly cause the shaking to be a lot worse with the engine cold than it is once it's warmed up? (When it's warmed up, I can increase the idle to higher rpm's and it doesn't shake like it does when the engine is cold.) I havn't looked at the motor mounts yet, I'm 87 and can't get down and up very easily any more, but some day when my son comes over we can look at those.

TorrentIV · Dec 29, 2019

Ed McMeans said:
Actually, cold here in Southern California isn't very cold, about 50 degrees. (I grew up in Northern Michigan where cold meant cold, finally got out of there) First thing I done on the car was to
change the oil to 5-30 full synthetic.

5w-30? Whyfore?

Shane Giggie · Dec 30, 2019

I run 5w-30 castrol in my 06 and it works great.

Ed McMeans · Dec 30, 2019

Just ordered new upstream O2 sensors, got my fingers crossed. I watched my scangauge when I started the cold engine. It started in open loop, then almost instantly went into closed loop. I'm thinking it shouldn't have switched that fast?

Shane Giggie · Dec 31, 2019

Ed McMeans said:
Just ordered new upstream O2 sensors, got my fingers crossed. I watched my scangauge when I started the cold engine. It started in open loop, then almost instantly went into closed loop. I'm thinking it shouldn't have switched that fast?

Maybe you have a bad fuel injector or injectors too??

Ed McMeans · Jan 2, 2020

Ed McMeans said:
Just ordered new upstream O2 sensors, got my fingers crossed. I watched my scangauge when I started the cold engine. It started in open loop, then almost instantly went into closed loop. I'm thinking it shouldn't have switched that fast?

Ed McMeans · Jan 2, 2020

Anyone know if there's a fuse I can pull to take the power off the O2 sensors heating element? When the jeep starts with a cold engine, my scangauge says it's in running in open loop for just a short time, during this time it's running pretty smooth. As soon a it switches to closed loop, it gets real rough until the engine is warm. I do have new sensors ordered, but I'd like to try getting rid of the sensor heaters just for testing. Any ideas?

Ed McMeans · Jan 2, 2020

Just found the fuse, I'll play with it tomorrow.

04 Liberty 3.7 2WD, Really rough idle cold

Ed McMeans

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