The C-101 connector is located on the firewall above your brake booster...

http://image.jpmagazine.com/f/285056..._connector.jpg

Your Crank Position Sensor (CPS) is located on top of the transmission bell housing on the driver's side. Just because it was replaced doesn't mean that it's working correctly. If it was replaced with one from Auto Zone, they have been known to fail very quickly, usually best to go with an OEM. However, you have spark so that reduces the likelihood of a bad CPS.

You've purchased an old car (or truck, some folks get butt hurt when you call an XJ a "car") and with it, the issues that arise with old cars. You're doing great so far, giving us the information we need to help. Just be patient and we'll get you through this. I would recommend picking up a multimeter if you don't already have one. It's probably the most important diagnostic tool you can have with a Renix era Jeep.

Once you've got the kinks worked out they really are very reliable, evidenced by the number of them you still see driving around.

 

Not on a Renix...........It's for sequentially firing the injectors only. Go out to any rEnix Jeep and unplug the dizzy. It will start.

 

Checked? Or refreshed? Looked at them or removed and cleaned?

The coil/ICU refreshing could be the problem.

 

It's called "crank-nostart" The engine is turning over with the starter but not starting.

 

havent tried the tps yet.. is that something thats could cause it to be intermittently no starting? its just so damn weird how itll run perfect one minute.. then sometimes no start at all, sometimes it starts but idles crazy and seems to be running rich.. also the temp gauge reads around 160 which seems low, but the hood getts hot as hell after running for a few minutes at idle.. sorry im going in so many directions.. just figure the more info i put out the better chance it may sound like something that i just dont know about.

 

Stay focused will ya? The TPS will not cause your problem.

PERFORM the procedures given you first. If it turns out they don't fix the problem, they needed to be done anyway. You're talking an hours time to do ALL the procedures, which could fix your Jeep, and you're spending more time than that asking question after question. Sorry to sound harsh, but you need to open the hood and get to work.

 

cruiser.. i disconnected the grounds i was able to find and cleaned them up.. and how can i go about refreshing the coil and ICU?? not sure where they are.. and what did you mean by unplug the "dizzy".. sorry for my ignorance, im learning as i go here.

and i mentioned the tps because someone here just said it could be that.

 

The coil/ICU write-up and the C101 connector write-up were included with the ground refreshing post.

It ain't the dizzy aka distributor internals so wipe that off your radar screen.

2 different views of the C101 are here. I believe F1Addict posted some photos up for you, too.

We're going to have to eliminate some things as possible problems first before we'll find the root cause. There is no silver bullet cure in automotive diagnostics as multiple things can cause the same symptoms.

 

ok thanks guys for the photos.. big help now i know where the connection is. ok well i suppose ill begin cleaning that up and removing my ground connections and clean them up and see what happens in the morning.. thanks again for the help everyone.

 

Don't forget to do the coil/ICU also. No shortcuts either on any of the write-ups. Remember this: You can't see electricity..

 

very true cruiser.. so your saying i should replace the icu and coil?? or check?? ive never used a multimeter before, i suck at electrical stuff, thats why im here.. someone said i should get one, is that what i should use to check the coil and icu?

 

Yes, you need a meter just cuz you own a Renix era Jeep. Easy to use. You don't think we all used to suck at electrical? . $15.

READ my instructions. You don't need a meter to refresh the coil/ICU connectors.

 

ok will do.. ill go back and re read ... its 5:30 in the morn here my brain is toast.. ill get at this stuff in the am after a few hours sleep. and ill let ya know what happens. thanks for the help much appreciated.

 

Excellent idea. Take your time and be thorough.

 

Oh yeah I've had experience with it before even brand new ones have faults. It's because there's no fire to the coil at all.

Op, did you zip tie your cps wire away from your manifold? It WILL short it out and cause crank no starts.