2002 Jeep Liberty - Misfire FIXED

[alvinss18]

This one is killing us.

We have have a 02 Jeep liberty 3.7. This was brought to us from a transmision shop that just rebuilt the tranny. The complaint was running rough. We checked spark and fuel, both are there. Found radiator blowed out. Ran compression check. Found no compression on three cylinders. Removed the heads and sent to the machine shop, it had three valve seats melted. Reinstalled heads and started. Vehicle ran rough but ran.
This is were it gets tricky. Now we are showing no injector fire on Three cylinders, the same that had the valves seats melted. We had injector pulse before we started this escapade. Trace it back to the computer. Install a new computer and reflash. Vehicle started and ran rough, not as rough, but rough. Found cranksensor loosing synch. Replaced crank and cam sensor. Vehicle will not start now and is showing a secondary code for a ignition coil.
Anyone have any ideas?

[steven kiser]

melted or damaged seats = cylinder failure.

[Stewart Levy]

So ? any fix or did it fix itself?

[alvinss18]

No not yet. Don't think there is a cylinder problem, we checked those pretty thorough. Got my man checking the timing marks again for the 3rd time. I don;t think that is it, just by the codes that keep coming up.

[Stewart Levy]

What scannner are you using. Can you read the ECU in live time!

[alvinss18]

Tech found it out of time by two teeth. Starting but running rough. Moved two of the fuel injectors that were at the valves that melted, and misfire moved with them. Got two injectors coming in the morning.

[steven kiser]

sonds like this will need prayer candels and pixie dust when this finally leaves.

[alvinss18]

At this point, I just want it fixed and gone. I already lost $$$. You try to trust your techs and their abilities, but these are the situation that gives you doubt. My guys are normally great. We had the timing discussion before he got into a "throw parts at it " method. It is my fault for letting him talk me into it.

[alvinss18]

Fixed and running like a champ

[steven kiser]

as an owner i'm guilty of that as well. it kinda goes with the territory. i have to rely on my techs. if i second guess them they'll start not making any diagnostic decisions. they'll wait for me...............................