enine boom ?

[xjeeper]

As some of you know i had some issues on the way home from rausch. I was going downhill and the cruise control was holding back my speed and i hear several loud bangs followed by a cloud of smoke. i let it coast to the side of the road where it shut off on its own. I was not able to restart it although it cranks strong with no bad noises. Anyone have any ideas on what went wrong? blown ring? bad valves?

[Burton58]

my guess is 230k miles on a 99 jeep optimus is the problem
sorry i had to say it, i have no idea what happened

[Mighty Quine]

enine? lol, maybe it was just time, get one from harrys and swap it

[xjeeper]

i already have a spare motor in my garage that i just have to put back together. im just trying to get an idea if it is something i could fix or just swap motors and start fresh.

[Buffalo Phil]

I got nothin.

[vinnycams]

Rausch eats jeeps

[BOX]

Rausch eats jeeps

nom nom nom

[Wide-J]

When my YJ was a 4 cylinder, pretty much the same thing happend. A valve just randomly broke off in the cylinder while driving. Let us know how you make out.

[Clause]

best to check the entire surface of the engine to make sure you didn't throw a rod. i would say it's safe to say that some part (the whole thing till you tear it down) is garbage and you should work on getting a replacement in there

[CumminsJeep]

i vote dropped a valve or threw a rod

[xjeeper]

ill keep you guys updated once i get it home and start tearing it apart.

[xjeeper]

ok i started off checking for spark and fuel and i have no spark. i pulled the dizzy and everything looks good. Next i drained the oil and found no metal particles. I am stumped because i dont know of any mechanical failures that would kill spark. Many people are assuring me that its the crank sensor but how does that explain the loud bangs and smoke?

[Magilla]

the easy way to check for a bad crank sensor hook up a good scan tool go into data steam crank it and see if you get rpms on the scanner

[xjeeper]

the easy way to check for a bad crank sensor hook up a good scan tool go into data steam crank it and see if you get rpms on the scanner

yea im gonna do a few tests for it tomorrow but how would that cause smoke and loud noises?

[xjeeper]

I guess it would sort of make sense for it to be a bad sensor. Sensor fails causing lack of spark which leads to misfiring (loud noises) and the smoke is from all the unburned fuel.


Today i checked compression on all cylinders and all were about even, over 120. They all held for 5 minutes with no drop. I tried disconnecting the CPS with no luck. It still sounds as if it has a stronger than usual crank though.