XJ running badly.
My XJ has a miss at 4000rpm. But my XJ is not throwing codes.
It plays up under load whilst driving. Starts really well, idles perfect, and tends to lessen when it warms up. Last week when I went to pick up my new rims, it got really really bad and felt like I lost more than 50% of power, at one stage I could not even rev past 2500rpm and when I put my foot to the floor, it just did not go anywhere past 2500 revs, even back fired a few times.
I thought seeing I live in the country it could have been bad fuel, I got fuel at 1/2 full tank, and filled it with the best fuel I can get being 98ron, and my Jeep seem to drive better, power was back again. But I still have this stutter/miss in second gear when it hits 4000rpm's, but no backfiring of any kind.
Prior to this about 2 weeks ago I had a parasitic draw that was draining my battery flat in less than 2 days, but I found the problem, it was the service light under the hood, so I pulled the fuse and left it out, and that fixed the drain, a few days after that the miss started.
My plugs and leads are about a year old, same for the air and fuel filter, and I also replaced the IAC at that stage. I have ordered new plugs, new fuel filter, new map sensor switch and TPS and a new coil is all coming in the mail this week. I already have the crank sensor switch, and will have a go at changing that out the next day or so (not looking forward to it with a bad back) to see if that fixes the problem.
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