I have a TJ Wrangler.. couple weeks ago my engine light came on, went to diagnosis it, came back the following:
number 3 cylinder, high fuel pressure, injector, and a couple other codes with in this notion.
i have changed out the spark plugs and number three was completely black, burnt out. put a new one in and ran fine for a week. light came back on ran the diagnosis again, same codes.
before changing out the injector I put in a injector cleaner before my last fill up hoping to clear the problem, but didnt. Replaced the old injector with a new one and still doing the same thing. I have been running it to help clear the code, but no luck.
Could be getting coolant in that cylinder, worth a look.
Remove plug after letting the the vehicle sit for awhile after a run.
Get a really bright flashlight and look through the spark plug hole, bring the piston up to tdc to have a look.
checked com. all cly. are at 160 = or - 5 tested with all plugs out. put a new plug in #3 drove it about 5 miles miss comes back pull the plug and it is all black new injector in #3. what do you think about the coil pack good or bad? lots of strong fuel when this happens.can the coil pack be tested?
It is possible the the coil pack could be bad. Not sure if you can swap with a good one or not but that would confirm it if the problem moves. Check the boot, too. A torn or punctured boot can cause a miss fire as well.
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all boots are in good condition. no tears or punctures. everything is firing. so far no white smoke upon starting and revving in place.. will take it for a test drive and see what happens. you guys are big help test drove it lots of white smoke going to do a pressure test on cooling system. why would
compression test come put good if gasket is creaked and not using water?
Last edited by bbarkhuff; 07-27-2014 at 01:38 PM..