JONGKENNEDY

2001 Jeep Cherokee w/4.0L, Automatic Tran, that sat in a parking lot for 8 months, throwing these codes according to the AutoZone scanner:

P0351 - Ignition coil primary circuit condition - coil
P1391 - CMP or CKP signal intermittent condition
P0715 - Input speed sensor (ISS) 1 circuit
P0705 - Transmission range circuit

*I am also getting a "no bus" on my odometer with my gauges not functioning. I have taken the cluster out and cleaned all the contacts with rubbing alcohol to no avail. Dialectic grease was applied as well.

What I have done so far:
-Changed the Camshaft position sensor
-Changed the Crankshaft position Sensor
-Changed the throttle position sensor
-New alternator
-New battery
-New fuel pump (unrelated problem... I think)

All these problems seem to be electrical, but that is why I am asking you guys. My Jeep starts and drives fine up unto a time when it starts to idle rough after about 5-10 mins. Sometimes after this starts and I accelerate it "drags" a little. (Sorry I cant be more descriptive)

If I let it idle, like at a stoplight, it will "poof". Its not a steady thing, it just does it randomly. Like its loosing power and then finds it immediately again.

If there is anything else I can add to help diagnose please let me know. Hopefully, one of you have a magic/cheap solution. Wallet is getting thin at this point. Again, Thanks for your time!

Roler

Well, you replaced quite a bit by now.
What brand sensors (especially CPS) did you put in?
Cleaned up all the grounds as well?

The " No Bus" issue: CCKen is good with things like that.

CCKen

Indeed, clean all your engine bay grounds (and battery connectors) before anything else when chasing "No Bus" and dead instrument cluster issues.

Open the link below and scroll down to post #49 for photos of the engine bay grounds. Ground G106 may not be an issue, but G100 and G101 are.

Scrub the ring terminals free from corrosion or other deposits and sand the rust off the fender at G100.

https://www.cherokeeforum.com/f2/gre...e-6558/index4/

JONGKENNEDY

Thank you both for the awesome info! The pictures will help alot.

Anyone have any tips/techniques for cleaning the connectors? PB Blaster and some fine sand paper? Toothbrush?

Any further guidance is appreciated!

CCKen

I use 3M Scotch-Brite Gray pads to clean the ring terminals. Available at Lowe's. Some folks use a fine sandpaper, such as 400 or 600 grit wet/dry sand paper.

Flush the ring terminals and ground points clean using CRC QD Electronic Cleaner (spray can). Available at all the auto parts stores.

Do not apply Dielectric grease to the ground point connections. If anything, use a product called Ox-Gard, found in the electrical section at Lowe's and Home Depot.