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sprinkles08
sprinkles08, ASE Certified Technician
Category: Jeep
Satisfied Customers: 22371
Experience:  Chrysler/Dodge/Jeep Master Certified, ASE Master and Advanced Certified, Trans and Hybrid Specialist
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We are still fighting the no shift when it ts the rev

Customer Question

We are still fighting the no shift when it hits the rev limitor at WOT. We adjusted the kickdown cable and even replaced the cable. He said the TPS checked out ok. He is stumped. It's been in the shop for three weeks now. If I floor it at 70 it gains speed
no problem. Had it up to 95 and then let off. So it can't be the cat.
Submitted: 1 year ago.
Category: Jeep
Customer: replied 1 year ago.
No response?
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to Justanswer!

Does it not upshift at wide open throttle in any gear or is it one specific shift?

Are any fault codes setting?

Customer: replied 1 year ago.
Just from second to third at WOT. No codes present.
Customer: replied 1 year ago.
Shifts fine during regular driving. Transmission doesn't slip either.
Customer: replied 1 year ago.
This has all happened since I got a new motor put in. It was fine with the old motor.
Customer: replied 1 year ago.
It has new fluid screen and filter in the transmission also.
Expert:  sprinkles08 replied 1 year ago.

Can you explain exactly how the throttle valve cable was adjusted?

Customer: replied 1 year ago.
Push the button push the cable toward the button and then open the throttle body to WOT and then release. I have watched videos on how to do this.
Expert:  sprinkles08 replied 1 year ago.

It's almost surely adjusted too short then and that will cause what you're having.

Do you have the ability to upload a picture?

Customer: replied 1 year ago.
Well its at a mechanic shop right now. It's been there for 3 weeks.
Customer: replied 1 year ago.
Can you get the measurements for the length it should be adjusted from the throttle body. He said no matter what he does it doesn't change.
Customer: replied 1 year ago.
It gains speed just fine from 70 to 95 just fine. If it was too short would it gain speed like that? Not sure if it will shift into 4th at wot either.
Expert:  sprinkles08 replied 1 year ago.

Is this actually a Grand Cherokee or is it a Cherokee?

Customer: replied 1 year ago.
01 Jeep Cherokee
Expert:  sprinkles08 replied 1 year ago.

Are there any modifications to the vehicle?

Was it a remanufactured long block that was installed? A used engine?

Customer: replied 1 year ago.
It was a remanufactured engine with a slight hi performance engine. Ported heads and a bigger cam.
Customer: replied 1 year ago.
http://indianapolis.craigslist.org/ptd/5176601736.html
Expert:  sprinkles08 replied 1 year ago.

The PCM software was custom programmed to allow for the engine modifications?

Customer: replied 1 year ago.
No it was not.
Customer: replied 1 year ago.
The guy who put it in never said anything about this.
Expert:  sprinkles08 replied 1 year ago.

Is the TCM data showing third gear being commanded when it isn't shifting?

Customer: replied 1 year ago.
I'm not sure he has checked that? What would that mean if it was or wasen't showing that?
Expert:  sprinkles08 replied 1 year ago.

If it's not commanding third gear then inputs need to be looked at, if it's commanding third gear but it doesn't apply then you have an internal trans issue.

Customer: replied 1 year ago.
What exeactly is inputs?
Expert:  sprinkles08 replied 1 year ago.

Vehicle speed, throttle angle, engine load, trans input and output speed, coolant temperature, trans temp, engine load, etc. Scan tool data will need to be looked at and analyzed by someone familiar with the system and normal value to be able to tell why a shift isn't being commanded.