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Cruise control issues

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  • Owner

I just remembered I had a weird thing happen and can't explain nor has it occured again. While I was towing my traveel trailer this last trip I had my cruise set for 55 MPH cruising towards Emmett, ID. It was really strange it was like someone lifting and stomping the throttle in a really jerky up down random cycle. Now remember I'm a fly by wire system no vacuum motor cruise. As for error codes there is none I check while driving (Scan Gauge II). As for the APPS sensor it shows 0 while cruise is active there is no signal (Scan Gauge II). I tested my alternator noise once I got to Emmett, ID and it was a normal 0.023 to 0.027 AC volts. After being shut down for the night I've never experienced it again.

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My 02 had a vacuum controlled cruise unit, must be an auto / manual difference. I did the straw reducer trick inside the vacuum tube to lessen the surging resulting from adding edge and everything else, it did lessen the surging a bit but didn't eliminate it by far.

My auto and cruise control do not agree on how things are or should work ever... surging from 0-12 psi of boost sucks.

But for odd things happening the other day I was under the hood of my truck aand my turbo looked like it had been pooped on. After a little searching I found 8 of the exhaust manifold bolts loose. I know I did the new 3 piece manifold about 4 months ago and torqued the new stainless manifold bolts to 35 ftlb. Just kind of strange.

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  • Owner

My 02 had a vacuum controlled cruise unit, must be an auto / manual difference. I did the straw reducer trick inside the vacuum tube to lessen the surging resulting from adding edge and everything else, it did lessen the surging a bit but didn't eliminate it by far.

 

Yeah... Mine is a manual and all fly-by-wire so there is no vacuum motor.

 

I had a buddy whose cruise control quit working... It turned out to be the clockspring assembly.... I wonder if it was getting bad contact??

Found this http://www.turbodieselregister.com/threads/237211-Cruise-control-clock-spring-repair  I'm not sure if our second gens are the same as the first gens

 

All my steering wheel controls seem to be working just fine. Accelerate, coast, cancel, on/off and set. I was playing with the controls while driving to try and diagnose but all of the controls work.

 

My auto and cruise control do not agree on how things are or should work ever... surging from 0-12 psi of boost sucks.

But for odd things happening the other day I was under the hood of my truck aand my turbo looked like it had been pooped on. After a little searching I found 8 of the exhaust manifold bolts loose. I know I did the new 3 piece manifold about 4 months ago and torqued the new stainless manifold bolts to 35 ftlb. Just kind of strange.

 

Once again no vacuum motor and not a automatic transmission... I'm a manual with fly-by-wire cruise control.

On mine going down the interstate at 78mph it will surge from 5psi to 10 psi and it is annoy all the time feel like I speed up slow down a bit never holds same psi. thought that was just normal on the old dodge :lmao: but mines a auto to so I can't really help you

The only time I could use my cruise was with a heavy load on/behind it, driving empty was out of the question it was just too much surge

Might be a dumb question... How do you know if it's fly by wire or vacuum controlled?

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  • Owner

Either you have a vacuum motor under the battery or you don't. The APPS sensor on a fly by wire only has one cable the throttle from the pedal that's it.

Either you have a vacuum motor under the battery or you don't. The APPS sensor on a fly by wire only has one cable the throttle from the pedal that's it.

Thanks! I'll have to check it out when I get it back from paint!

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