Nevada Backroaders
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Hiccups?
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Author:  Justin [ Tue Feb 26, 2008 5:15 pm ]
Post subject: 
Well, drove to overton again this past weekend and did not get the dead engine symptom and the missing is greatly reduced but not absent. may look into crank position sensor and TPS. Any Idea where they are? :oops: Crank sensor is where the distributor would be?

Wish mine had a distributor and wires instead of a one piece electronic unit at $125 from the dealer. obviously the last part to be changed for troubleshooting.

Sigh :? Another trip to Overton and St George for this weekend too, getting ready for archery season. T-N-T Archery, Santa Clara, Ut. Awesome little place.
Author:  Rubicon Bob [ Tue Feb 26, 2008 5:22 pm ]
Post subject: 
Justin wrote:
may look into crank position sensor and TPS. Any Idea where they are? :oops: Crank sensor is where the distributor would be?


The TPS sensor would be attached to the butterly rod on the throttle body. The crank sensor would be down by the cranksaft, almost where timing marks might be.
Author:  Afrog [ Tue Feb 26, 2008 5:44 pm ]
Post subject: 
On my 99 TJ, the crankshaft position sensor is mounted to the driver's side of the transmission bell-housing. You should only need to follow the exhaust down pipe to find it. It will have some wire loom running to it as well. It's one of those that you'll either need to raise the Jeep, or crawl underneath to get to. Just a couple of bolts to pull it, and the Haynes manual says something about attaching an ohmmeter to it to test.

Per Haynes:

"Disconnect the CKP electrical connector from the main wiring harness. Connect an ohmmeter across terminals A and B (marked on the connector). The reading should be 200 plus/minus 75 ohms (engine at normal operating temperature). If the readings are not to specification, replace the CPK

As for the TPS, the book says:

"Checking the TPS is beyond the scope of the home mechanic. Take the vehicle to a dealer service department or other qualified shop for diagnosis.

Removal:

Remove the upper and lower air inlet bonnets

Remove the throttle body - not absolutely necessary, but makes it easier to get to the TPS. If you don't remove the throttle body, then unplug the TPS connector (2 on automatics)

Remove the TPS mounting screws

Remove TPS from throttle shaft lever.

Installation in reverse

Hope that helps.
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