ALL of the old plugs we pulled out we're kinda white. Kinda like a beige color. Not on the post, but on the sparking end. I'll pull cylinder 1 plug tomorrow and see what 800 miles from missouri to colorado did to it. Lets say it was the head gasket... how much money am i looking at? Another thing i was thinking was that cylinder 1 may be siezed up? When we pulled the electrical harness off the fuel injector to cylinder 1 we felt little to no difference in the way the engine was running. When we pulled cylinder 2 electrical harness to the fuel injector the engine started getting really choppy. All cylinders are getting spark and fuel though. Tested all plugs and electrical to all fuel injectors and found no problems.
Here is what the guy that looked at it from missouri has posted on another forum about my problem... maybe this will help... ? As far as Jeeps go, this guy seems to know his way around the engine. I dont think ive ever learned so much in 2 hours then i did watching him test my engine. Oh, and he fixed my A/C to!
" ok guys,
the OP just left here after a couple of hours of wrenching.
scanner was giving a code P0301, cylinder #1 missfire.
looked at #1 plug, and decided to get new cap, rotor, wires and the correct champion plugs. all plugs gapped @.035.
after a little running, got the same code!
i swapped my injectors to ford motorsport injectors a week ago and kept my old injectors, so installed one in #1 cylinder.
the old one looked like crap after 150k miles.
after a run up the road, it threw the same P0301 code again!
did a little more rooting around, wiggling plug wires and so on. all plugs are now getting a good spark, so i doubt any ignition issues.
also tested the injector plugs with noide lights, getting a good pulse at the iinjectors.
unplug an injector while running and there is a slight change in engine pitch.
when he left here, all was well so i am hoping we did cure it, but i am dubious as it started acting up after the first time round.
when it acts up, the idle goes from 750 to @1000 rpm's. vacuum was between 16 and 27 in hg. so good vacuum i think!
time permitting i would haev pulled the plugs and done a comp test, but they had a long drive and low comp isnt an "easy fix" so i didnt bother with that.
he did say that it felt a LOT faster on acceleration now, no doubt due to new plugs, leads and so on.
any other suggestions for him, assuming the issue comes back as it did before?
again, the code was P0301.
it is bugging me, as i feel bad when someone drives out of my driveway not fixed!
cheers
martin"
" jonathan,
a pleasure having you and your better half around mate, you are welcome anytime!
sorry to hear the cel showed itself again. if it is running good going down the road, i would roll with it and see what shows up when you get back home.
i doubt it is the coil (its a 1998), as it is always showing number 1 cylinder is misfiring. maybe someone can chime in if a bad coil will show itself as number 1 misfire????
the elevation should also be a no go, as the ecm will learn a whole lot quicker than that! i spoke to a friend of mine, and he is thinking the ecm itself, but i wouldnt go down that road until all over avenues have been explored.
try to get the codes read and see if it showing P0301 again. if so, i think my next step would be a compression test across all cylinders. all that involves is removing the plugs and the power wire to the coil, and cranking with the gauge hooked up to a cylinder until all have been tested. it should show a pretty much even number across all 6. i do have the compression tester, but it was getting late after doing the ignition and injector!
keep me posted, and have a safe trip home!
martin"
" no problem jonathan!:thumbup:
i would have liked to do the compression test on it, but time was short.... it was 3am before i got parked up last night as it was!
i dont think head gasket myself, as there was no pressurizing of the coolant etc. when the 4.0 head gasket goes, it will normally blow coolant out, dont ask me how i know that:bawl: that was on a 91, but basically the same 4.0 h.o. motor.
it was also reading pretty good vacuum to have a head gasket leak IMO. but i have been wrong before, too many times to count!
keep me posted, this has me kinda stumped too mate.
say hello to karen for us.
martin & cheryl."
ROCKS. :yelclap::yelclap:
