Hi people ...cold start my jeep horrible vibration thru whole jeep after warming up gets better but not gone ...thinking motor mounts anybody having same issues...its a 4 liter Thanks

 

Welcome to CF!

Yeah, I'm thinking motor mounts combined with a weak cylinder that seals better after it warms up. Just a guess, mine you.

Do a cold compression check as well as check/replace the mounts. Don't forget the trans mount.

 

When was the last time the plugs, wires, cap, and rotor replaced?

 

Thanks dave1123 and bustedback gives me somewhere to go next, full tune up has been done, next mounts and compression test

 

Hey there, I was having an issue for about a week and I found that My Ujoints were bad

 

That's nice, but what does that have to do with cold startup vibration?

 

My apologies dave, I thought I Was replying to another thread. They were having a heavy vibration from 40-55 mph. That would be the Ujoints. This one I would guess at the motor mounts. Have you gone under the car when first starting?