Dad's 4.0 running odd

[Blue88Comanche]

Dad's MJ was in the shop last week to get a new steering box and an alignment. when we got it back the engine started running rough. when it idles it shakes the jeep as well as when load is applied it will start shaking more. there is a more pronounced knock coming from the engine now as well. we replaced the spark plugs, the spark wires are new as well. the jeep is an auto. it smooths out some while at around a constant rpm of 2200 - 2500.

 

the knock sounds like it is in the front of the block, if that helps any. what would be the likely cause?

 

thanks

Jeff

 

nO2YIPnWmsc

[cruiser54]

Lifter tick/valve train related. What happens if you shut it off, wait a minute and restart?

[ajpolitz]

Dad's MJ was in the shop last week to get a new steering box and an alignment. when we got it back the engine started running rough. when it idles it shakes the jeep as well as when load is applied it will start shaking more. there is a more pronounced knock coming from the engine now as well. we replaced the spark plugs, the spark wires are new as well. the jeep is an auto. it smooths out some while at around a constant rpm of 2200 - 2500.

 

the knock sounds like it is in the front of the block, if that helps any. what would be the likely cause?

 

thanks

Jeff

 

nO2YIPnWmsc

 

 

I had a similar situation and found it was a plugged fuel injector on he first cylinder.

Was the spark plug blue in color from the front cylinder?

[Blue88Comanche]

I had a similar situation and found it was a plugged fuel injector on he first cylinder.

Was the spark plug blue in color from the front cylinder?

 

I will check that this weekend when i get the chance