Need help diagnosing engine running rough
#1
Need help diagnosing engine running rough
My 940 manual lpt runs rough and vibrates a lot at idle and even more at 1500rpm. I've changed plugs, cleaned PCV, changed all filters, ran injector cleaner, etc.
The car does have a crack both on front muffler and cat, but why would it only vibrate at idle and 1500?
I'm suspecting a dirty MAF or distributor issues but i really dont know. What do you guys think?
Seems worse when it rains and today the engine cut out in the morning while idling cold.
#2
Link to video of my car running
My 940 manual vibrates a lot at idle
Seems worse when it rains and today the engine cut out in the morning while idling cold.
My 940 manual vibrates a lot at idle
Seems worse when it rains and today the engine cut out in the morning while idling cold.
#3
If the engine is running smoothly just vibrating at idle, worse when the engine is cold - Your engine mounts have sagged and are not absorbing the vibration of the engine. When bad enough, the pan pan will touch the sub-frame. The motor mounts are pressure filled - and very soft to absorb the engine vibrations. That pressure leaks out and the mounts sag. Check your trans mount also - they are just a rubber block, but can break and cause vibration problems.
#5
i tried plugging the cracks on the exhaust recently and i believe the car was vibrating less, but putty didn't hold long. Could be coincidence.
#7
I'll test them tomorrow. I tried revving while looking at the engine and it didn't seem to move much. I should have someone rev it at 1500 and see if the engine itself is vibrating more at those rpms.
#8
#9
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