Have you checked the intake manifold bolts for proper torque? Also you may want to check engine mounts as well. My 2013 JGC had a fish bite to it on the highway and it turns out the passenger side mount was shot.
Autostick does 90% of the time make the jerkyness vanish. At first I thought it was purely the MDS turning on and off causing it. I will try to get video. It is more of a feel than sound. However the magnaflows let you know when the MDS activates. It almost sounds like a misfire.Does AutoStick always make the behavior go away?
Also, if you could record a vid clip and share that it would be more helpful.
If your tuneup only consisted of spark plug replacement, I’ll almost bet you have one or more coil packs going south.Autostick does 90% of the time make the jerkyness vanish. At first I thought it was purely the MDS turning on and off causing it. I will try to get video. It is more of a feel than sound. However the magnaflows let you know when the MDS activates. It almost sounds like a misfire.
I’ve checked for codes but have none. How do you check for bad coil packs? Not exactly cheap to replace like the old plug wires lolIf your tuneup only consisted of spark plug replacement, I’ll almost bet you have one or more coil packs going south.
I smell a rabbit hole...Autostick does 90% of the time make the jerkyness vanish. At first I thought it was purely the MDS turning on and off causing it. I will try to get video. It is more of a feel than sound. However the magnaflows let you know when the MDS activates. It almost sounds like a misfire.
No, I am thinking somethings up with my wiring if I lose the HVAC controls simply by unplugging the left front speaker.Are you thinking torque converter shudder @Nuke ?
(Why was the engine replaced? And who replaced the engine?)Hello everyone ! I have a 2010 Challenger RT auto with 95k miles and 55k on a new engine. Mods? CAI and oil catch can. Magnaflow mufflers. My car seems to bulk while driving at a constant speed 35 mph saying through city or residential areas. Maintaining speed at 35 car wants to jerk back and forth as you gently left off the accelerator. In the old cars i would swear it was a vacuum problem. I’ve cleaned out the oil catch can and retightened the fittings. It seems to get better but then worse. I’ve tried throttle recalibration with moderate success. I’ve cleaned the MAP sensor as well to same amount success. Better than back to annoying. I am 18k since the last tuneup and 33k since the dealer changed transmission fluid and filter. I have checked for codes with scanner and there are none. Just kinda annoying. Driving auto stick makes it better at times. Anybody else have this issue?
Cold start or if it has been sitting for 30 minutes or so it is fine no problem. After driving it for about 10 minutes or so with it at operating temperature it will start to jerk. If you accelerate the car will bog down for a second then respond.as long as you accelerate in 5th gear it is fine.Does AutoStick also prevent the behavior (start out from a dead stop in AutoStick)?
You said it starts at about 35 mph, does it go away eventually? What speed?
Does it matter if the engine is warmed up completely or if it’s the first drive of the day?
If you accelerate when the vibration occurs, does the vibration get worse with RPM?
The original engine was destroyed when the timing guides on the engine broke. Dodge dealership replaced the engine under warranty. Since then Dodge has changed out the guides again due to recall. This car was a victim of the timing chain issue you read about on the web.(Why was the engine replaced? And who replaced the engine?)
That in auto stick mode affects the behavior suggests to me the problem is with the transmission. 95K miles is not a lot of miles but automatics can go bad at any time.
Can you check the transmission fluid level? Is it ok?
Absent a CEL and one or more misfire codes I would not at this time suspect coils or plugs.
Well, check that. I had a car manifested a slight hesitation at highway cruising speed. (Manual transmission.) No problems at any other times. No CEL.
Turned out a plug wire was loose on a plug. I had the plugs changed some 1000 miles earlier at a dealer and I guess the tech left one plug wire loose. It sparked over good enough for a while but the sparking eroded the wire connector. It would no longer snap onto the plug. I stopped at a hardware store and bought a set of pliers and squeezed the plug wire connector a bit so it would snap on to the plug. At a Ford dealer I bought a new set of plug wires to have for just in case my "fix" didn't last. It lasted until I sold the car after putting another 90K miles on it. The new plug wires were in the trunk. I have never had to use them.
So check the coil wire connector to the plug. While you are there be sure every coil's connection to the wiring harness is secure, too.
When was the fuel filter changed? The air filter?
Funny you mention the jerking starts after 10 minutes. I had a problem with my challenger RT manual where I would get a fishbite at low RPMs until the engine warmed up. It wasn't until recently that I logged exhaust cam position did I find that VVT was oscillating (see very bottom plot).Cold start or if it has been sitting for 30 minutes or so it is fine no problem. After driving it for about 10 minutes or so with it at operating temperature it will start to jerk. If you accelerate the car will bog down for a second then respond.as long as you accelerate in 5th gear it is fine.