Shuddering
08-24-2016, 03:57 AM
#1
JK Super Freak
Thread Starter
Shuddering
Have an '08 auto with 70,000 miles. Lately the jeep has been shaking/shuddering when the engine is lugging under load at low rpms. Doesn't happen when it's not lugging. Also occasionally had a rough idle but not usually. I'm considering changing plugs and wires as well as cleaning the throttle body. Any other recommendations? Otherwise runs great and doesn't burn much oil. I've kept up on all maintenance per the service manual. Thanks.
08-24-2016, 12:31 PM
#2
JK Junkie
I wonder if it could be severe spark knock. Put a full tank of 93 octane in. If the problem goes away then you have spark knock. I had that on a Ford Explorer. Run 93 all is fine. Run 87 or 89 and it ran like crap when calling for power at low rpms.
08-24-2016, 05:12 PM
#3
JK Junkie
could be something other than engine
motor mount , drive shaft, some times the load can bring out the vibration
just something to check out . sometimes even front end parts could make you think its engine under a load, & under regular rpm the start of a shimmy
just something to check out . sometimes even front end parts could make you think its engine under a load, & under regular rpm the start of a shimmy
08-24-2016, 08:07 PM
#4
JK Super Freak
Thread Starter
If it were a spark knock wouldn't I get a check engine light?
08-25-2016, 05:11 AM
#5
JK Junkie
I never got a check engine light on my Ford Explorer. I drive it for a couple years in that condition. Once in a while someone would screw up and put 87 octane in. I wouldn't get more than a mile down the road when the spark knock would come back. Engine light never came on. I never addressed the root cause. I figured it was cheaper to keep using 93 octane than it would be to get it fixed. Most ford forums suggested it was a leaky intake manifold.
08-25-2016, 01:15 PM
#6
JK Junkie
Hey Jordan, If your cruising around and rpm drops to around 1,500 and it starts shuddering like your driving over rumble strips it's probably your torque converter.
Mine had the torque converter do this and I had it fixed by the dealer a while back. I had less miles than you do too.
Mine had the torque converter do this and I had it fixed by the dealer a while back. I had less miles than you do too.
08-25-2016, 01:18 PM
#7
JK Junkie
If it were a driveline problem it would be more of a speed thing and wouldn't depend on engine rpm. I think the rough idle and shudder could be related, but you're also due for plugs and wires.
Good idea on cleaning the throttle body at the same time.
Good idea on cleaning the throttle body at the same time.
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08-25-2016, 01:49 PM
#8
JK Super Freak
Thread Starter
Hey Jordan, If your cruising around and rpm drops to around 1,500 and it starts shuddering like your driving over rumble strips it's probably your torque converter. Mine had the torque converter do this and I had it fixed by the dealer a while back. I had less miles than you do too.