Hello to All! New member here with a new to me 97 TJ. Owned a CJ7 many years ago and finally have gotten a replacement! My problem is a bad misfire, setting codes P0300 and then P0301 thru 306. Obviously every cylinder. Misses at idle and on the road. It also idles up and down between 750 and 1000rpm and then will gradually decrease till it dies. If I unplug the MAP sensor on the TB the idle variation stops but misfire is still there. Guessing that the computer is using that to try to compensate for the misfire but don't know. IAC is new as is the TPS. It appears that the PO had replaced lots of items chasing this problem (I knew it had this going in). I even put a new crankshaft sensor in knowing that the one it came with looked new. Coil seems to check out good (internal resistance, signal to it, etc) From what I have found while researching this problem it seems that these are very sensitive to having OE sensors so I'm thinking that's it but wondering about the PCM (or ECM, not sure which is the correct term). I've been fooling with it for the five days I've had it (long time I know!) and am about at the point to take it to a mechanic to get it diag'd. Sure don't want to drop the money on a PCM and reluctant to buy another crank sensor from Mopar for $140 without knowing fairly sure this will fix it. Thought I would reach out to y'all here since there is obviously a huge amount of combined knowledge and helpful members on this site!
Thanks for any help you can offer!
Thanks for any help you can offer!