GU 4.2 TD Cruise Control surging

Submitted: Sunday, Jan 27, 2008 at 21:23
ThreadID: 53940 Views:2049 Replies:2 FollowUps:6
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G'day, have a 2004 GU 4.2 TD wagon, factory cruise control, it works faultlessly at 80, 90, 110, 120, but at 100 k's it surges terribly. Any clues as to what it could be? Thanks in advance. John
John

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Reply By: Member - joc45 (WA) - Sunday, Jan 27, 2008 at 23:42

Sunday, Jan 27, 2008 at 23:42
Did you try to get Nissan to fix it while it was under warranty?
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Follow Up By: Member - John - Monday, Jan 28, 2008 at 07:43

Monday, Jan 28, 2008 at 07:43
joc, No, wasn't mine when it was still under warranty, am planning on asking Nissan, but, thought I would ask the knowledgeable forumites first. John
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Reply By: Member - Bucky (VIC) - Monday, Jan 28, 2008 at 05:17

Monday, Jan 28, 2008 at 05:17
I had Nissan fit a "factory" cruise to our Navara..

An after-market one is what it turned out to be.. a Command Cruise Control,, might pay to check the unit, ( units ) under the dash/bonnet.

It may need to be electronically set, which just requires it to be put into test mode, then set it up again.
If your cruise control is a manual, and not hooked up into the wiring loom, then check the boxes/controllers, and you may find a sensitivity switch,,, turn it to low

You may have a split in a vacuum hose somewhere, or the hose is too long.

Another thing to consider, is that it could be your turbo, chasing its tail. On for a squirt, then off for a squirt..

Fun and games eh ?

let me know ,
CHeers
Bucky


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Follow Up By: Member - John - Monday, Jan 28, 2008 at 07:47

Monday, Jan 28, 2008 at 07:47
Bucky, Factory cruise, will check the vacumn hose, but if it had a leak, why would it work well at all but 100K's? What do you mean by the turbo "chasing it's tail"? Thanks for the reply, John
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Follow Up By: Member - joc45 (WA) - Monday, Jan 28, 2008 at 13:37

Monday, Jan 28, 2008 at 13:37
Hi Bucky,
When I bought the GU back in 2000, the salesman said there was a factory cruise control available for about $700. When pressed, it turned out to be an aftermarket one, so I knew that any problems it might have would not have been handled that well by Nissan. I ended up buying a Command unit (AP50) from Kmart for about $150, and am very happy with it. The AP50 has user adjustments for sensitivity, so one can optimise response time against surging.
Gerry
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Follow Up By: Member - Bucky (VIC) - Tuesday, Jan 29, 2008 at 04:33

Tuesday, Jan 29, 2008 at 04:33
That's the one !
Works fine, used every day, Will only vary 1-2 km/h, uphill too
To be honest, I cannot remember the model # now, been over 4 years since I looked at it ..
Cheers Bucky

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Follow Up By: Member - Bucky (VIC) - Tuesday, Jan 29, 2008 at 04:38

Tuesday, Jan 29, 2008 at 04:38
John,
Chasing its tail, means surging.

Probably caused by over compensating the "on and off the throtel" movement.

Cheers Bucky
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Follow Up By: Member - joc45 (WA) - Tuesday, Jan 29, 2008 at 14:50

Tuesday, Jan 29, 2008 at 14:50
Response time determines how quickly the CC unit responds to a change in vehicle speed. Too quick a response time, and the unit over-corrects, causing surging up and down in speed. Too slow and it's, well, too slow! Autos are easier to work with a cruise control than a manual as the vehicle is usually in optimum gearing for the speed. The response time on my manual GU is optimised for 5th gear. If I use the CC when driving in 4th, the torque is greater, and the vehicle responds quicker to throttle movement, causing mild surging. But if I was towing something in 4th, then the torque would not have the same effect. So it depends on loading as well.
Gerry
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