Have Jeep Questions? Ask a Jeep Repair Expert for Answers
Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.
All 4.0L engines use hydraulic lifters, so no adjustments are required.
Please reply to this if you need more help and we can continue this conversation at no extra charge. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Hoping to be giving you 5 star service.
They will pump up with oil pressure, no need to set them.
Rocker arm bolts are 21 ft lbs.
There is no sequence just alternate.
If the valves were open too far you would have no compression. This sounds like you have a vacuum leak.
Did you put all rockers and push rods back in the same spots?
The pushrods should be the same lengths.
Check for vacuum leaks after the throttle body, this would cause a high idle.
Disconnect the cruise control. I have seen this cause your issue as well.
Connects to the throttle body. There should be 2 cables. One for the pedal and one to the cruise actuator, follow the throttle cables.
To the cruise actuator and disconnect the connector.
You could also unhook the cable.
Check the idle air control valve if may be stuck open.
On the throttle body it has a 4 pin connector on it.
The one on the bottom in the picture.
You have to unbolt it. Use throttle body cleaner to clean the passage way.
Yes you pointing at the idle air control valve.
You have to unbolt if to check it, also clean it with throttle body cleaner, and clean you throttle plate as well.
Yes that will work.
That looks stuck open. It should move in and out as the motor turns, but it should be closed when you remove it.
If the valves were stuck open you would have no compression, therefore the engine would misfire. A compression test would verify this.
Do you have any codes?
If you have a hard code it would set right away. A throttle position sensor would cause a code, and would not cause the engine to rev, a vacuum leak that is acting like the throttle plate being open like the IAC valve being wide open would cause this.