Patamor

As title says my 4.0 96 Cherokee isn't giving any spark. It died once on my girlfriend a couple weeks ago but when I got there it fired right up.

2 days ago it just won't start. I started reading the forums and did a spark test. No spark before the distributor so I go and replace the crankshaft position sensor. Still nothing so i changed the coil and as the inside of the distributor cap was corroded i changed it too. Along with the rotor.

So that's what I've done so far and there's still no spark. I've tested at the exit of the coil and nothing...

Any help welcome!

BustednRusted

key the ignition and get the codes.

peep

Check your supply into the coil.
If nothin going in, go to Crank Position Sensor. Many threads on this. Check Cruiser's Tips, excellent guidance.
If you have supply in, then it's a coil problem.

Patamor

Only throwing codes for O2 sensors.

In the connector before the coil I don't get any voltage with the key on but I get 11v in the green wire variable reading on the black wire when i crank the engine. But no spark out of my new coil...

Yesterday a friend told me to clean the ground of the coil... I'll try that today

BustednRusted

If it's throwing codes for an 02 sensor, replace the 02 sensor. Trust me. I spent weeks and weeks trying to track down a no spark exactly like you describe. Swapping parts, cleaning all the grounds. Finally thought to check the codes, and it was throwing a code for a TPS. Swapped in a new throttle position sensor and BAM! spark back, fired right up purred like a kitten. A tps fer chrissakes! Not only that but the tranny started shifting normally instead of revving to 4 grand to get into second, and not having a third.

Patamor

Meh who knows!
I'm away for a month now so i won't be able to do anything until then but I'll keep you posted!

BlueRidgeMark

The O2 sensor may need to be replaced, but I can't think of any way it could cause a no-spark condition. The TPS, yes, the O2, no.

The Cam Position Sensor may be the problem, but I'm more concerned about that 11v reading. That could be a problem. You should see full battery voltage there. On the other hand, since it's variable, you may be seeing an average, which of course would be lower. Does your meter have a hold function? If so, use it to see the peak voltage.

Where did you ground your meter when you took that reading?