Crank Position Sensor Replacement

[Alance323]

Hey everyone! New to the forum, also new to TJ ownership!


Recently bought a 1999 4.0 sport-5 speed manual transmissionDrove fine during the test drives and getting it home but a few days later it wouldn’t completely turn over when starting. Spoke to the guy I bought it from and he immediately said bad crank sensor (pretty sure he knew beforehand). I disconnected the battery, reconnected and it started right up. Since then it’s been about 2 weeks and hasn’t had any issues with starting except once when it stalled when parking. Did the same thing and disconnected the battery and it started back up. Idle is a little rough, but no other issues I can feel or find. Had a check engine light only when it wasn’t able to start but I believe the battery disconnect cleared those codes and haven’t had anything pop up when driving, although I haven’t been going more than 10-15 miles in a trip.

I’ve ordered a mopar sensor for replacement but unsure if there’s anything else I should look in to currently or just swap the sensor first and go from there?

I’m very much a beginner with mechanic work and jeeps but am pretty handy and truly appreciate this forum and the how to section specifically! TIA for all the great help.

 

[tworley]

Find out what the code is and replace/fix what it is suggesting.

 

[Alance323]

Find out what the code is and replace/fix what it is suggesting.

That’s my issue currently-throwing no codes and no engine light. I know it’s essentially don’t fix what isn’t broken but wondering how long this really has been an issue if the prior owner was as confident as he was in knowing it right away.

 

[Jerry Bransford]

Those symptoms certainly could be caused by an intermittent crankshaft position sensor. Going with a Mopar was a wise decision, and hopefully you ordered the correct model that is for a manual transmission. The CPS for an automatic transmission is different. Let us know what happens after you replace it.

 

[Alance323]

Those symptoms certainly could be caused by an intermittent crankshaft position sensor. Going with a Mopar was a wise decision, and hopefully you ordered the correct model that is for a manual transmission. The CPS for an automatic transmission is different. Let us know what happens after you replace it.

Thanks! Took me forever to figure out that the manual and auto had different CPS part numbers. Almost went with the incorrect one until I found a link on this forum to the part on Rock Auto. So many sites listing these incorrectly! No garage and rain in the forecast this weekend so might wait a week but seems like an easy enough replacement with a difficult access to the actual sensor.