p0301

1998 Sahara TJ 4.0 5 Spd (215k miles) Hello all, I am attempting to chase down a bad misfire that randomly started around a week ago. I daily drive my TJ, change the oil every 3500 miles, and don't beat on it hard. It's very rough on idle, but appears to be fine when driving, other than being...

Hey y'all, I'm at my wits end trying to solve this issue plaguing my TJ for a while now. Here's a basic run down of what's going on: 1) A while back I was having some starter issues. I would turn the ignition and nothing would happen, the jeep had power but no cranking. If I jiggled the brown...

Having trouble nailing down the cause of my P0201 and P0301 codes in my 2004 with the 4.0. There is a lot of info below so please bear with me. Here is what I'm experiencing after battery disconnected and engine cold: Within 5 seconds of start up the P0201 code is thrown. Engine runs but has a...

Ugh. 4.0L Automatic 2001 TJ Sport 120k miles. So 3 months ago (aprox 600 miles ago) my TJ spit out a P0301 on the reader. It idled rough and eventually broke down on the highway where I just simply lost power from the engine. Got it started again got home. It started again like 3 more times...

As the title says, I have a misfire on cylinder 1 at idle. It's a 1998 4.0 with 165k miles. I can feel slight vibrations while in the car and it is idling. I had this code a few months ago and changed the plugs, coil wires, distributor cap, and the distributor rotor and the problem went away...

I fixed my speed sensor so that’s knocked off. What could be causing my cylinders to misfire. I replaced my injectors and plugs not too long ago.

Just as I'm leaving tonight for the North Cascades, my Jeep throws a P0301 code at me. I suspect that it fired after I held my starter an extra 500 milliseconds longer than usual, but I can't get the code to clear. The freeze frane showed th RPMs at 253 when it fired, so I dunno. It is driving...