Yj No spark after random engine shut off.

[Ryn109]

I tried to drive my jeep just now and It started up and ran for like 3 seconds, then shut right off with no sputter. I've drove 300+ miles since I've done motor and tranny swap and went wheelin a few times. Pulled #1 spark plug to check for spark and none. This sound like coil or distributor cap? Just wondering if anyone else has experience this. It's done this one time before a few weeks ago but did start back up after cranking on it for about a minute.

More info : Motor cranks, fuel is being pumped to fuel rail.

Thanks for any input, Ryan.

 

[JOOP]

what year YJ? 4.2 or 4.0??

 

[JAWS]

Check the pickup in the distributor. Comon on those.

 

[PHILLBILLY1]

what year YJ? 4.2 or 4.0??

You just want his exhaust manifold:haha:

 

[Ryn109]

what year YJ? 4.2 or 4.0??

92 yj, motors 97 4.0 using OBD1.

 

[Ryn109]

check the pickup in the distributor. Comon on those.

cps?

 

[Flat-Bed_3rd_Gen]

Pull coil wire off cap and crank see if you get spark. If you do it's probably the cap. If you don't try known good coil or test crank sensor

 

[JAWS]

cps?

:awesomework:

 

[boxboy]

is the fuel pump running? check your relays

 

[Ryn109]

is the fuel pump running? check your relays

Fuel pump is running. I can hear it and it pumps fuel up to rail (not sure on the pressure). I'm not getting a spark right now. Plugged in another coil - nothing. Put in another CPS - nothing. Gonna buy a new distributor tomorrow, the distributor pickup cost 10 bucks less than a manufactured dizzy.

 

[Ryn109]

Plugged in my spare coil, another distributor, still no spark. Plugged in a other CPS I had from older tranny still nothing

 

[Ryn109]

So i'm getting 12 volts at coil and about 5 at distributor. There anyway to check an ignition switch?

 

[KarlVP]

Did you try a NEW crankshaft position sensor?

Those are notorious for going tits up on the 4.0L

 

[Ryn109]

Did you try a NEW crankshaft position sensor?

Those are notorious for going tits up on the 4.0L

Not a NEW one but 2 different ones I had from doing motor swap. But im about at the point to start buying new everything :booo:

 

[Flat-Bed_3rd_Gen]

Is the Cps from a 97 or the 92 motor... You need to use the 92 cps. Which flexplate/flywheel did you use? 92 or 97?

 

[Ryn109]

Is the Cps from a 97 or the 92 motor... You need to use the 92 cps. Which flexplate/flywheel did you use? 92 or 97?

even if they were both round plug ins? looked identical. but yeah im using the 97.

 

[Flat-Bed_3rd_Gen]

try the 92 there are two styles that were used

 

[Ryn109]

With speed control sensor on the tcase unplugged. Fires up. :fawkdancesmiley: Thanks for all the info guys.