Thread: Throttle surging while driving constant speed

The cruise control goes up in 2kmh increments,prolly just a sensor calibration issue if that...within tolerance (just)

Yeah Eric is spot on. It’ll move within 2kph either side of the set speed before it takes more severe action to maintain it

Originally Posted by DiscoJeffster

Yeah Eric is spot on. It’ll move within 2kph either side of the set speed before it takes more severe action to maintain it

Thanks for the info I just find it strange that you get a real surge to get that extra kilometre back, if cruise is set at 110 km electric speedo says 111km then it drops off back to 110 and surges to 111 again you can really feel it in the car my old D3 never did that just a bit strange.

I'm with Coopers1969. I have a 2011 D4 SDV6 and it's doing 'exactly' the same thing and has been doing it for the last few months. 108kph or less and ops normal. If I manually drive at 110kph or set cruise control to 110kph or higher it 'hunts' to maintain speed. It's not behaving as though it's just fluctuating around the set speed in a normal fashion. It really feels as though a fault somewhere is not allowing it to maintain a smooth, constant speed from above 108kph and it's definitely hunting and surging to maintain speed. Other occupants in the car can feel it and have asked if that's me driving poorly or the vehicle doing it. I too have had a complete transmission fluid flush and replacement with new filter and bottom pan by well regarded Ritters in Melbourne. It's just been in for an unrelated service and they did everything they could to identify the problem to no avail. No fault codes. If I'm towing, there's a light vibration felt throughout the vehicle at speeds above 104kph. Not sure if it's directly related to the above-mentioned issue or not but it began around the same time the speed 'hunting' issue began. Vibration only when towing. Different trailers makes no difference to vibration issue.

Diagnosed by Range Rover Rockhampton. Oxygen Sensors.
im currently on a lap of aus and have noticed this issue for the past two weeks.

trying to drive a constant highway speed but the revs keep surging despite being very constant on the accelerator or having cruise control on.

it’s quite annoying and happens with or without the caravan on the back. I can feel it slightly vibrate the car when the van is on before jumping back a gear. Without the van on you can hear it and slightly feel it but generally holds the same gear.

see video here
YouTube
have had a gearbox service a year ago. Is there anything I can check on the road?? Currently in streak bay in SA and about to go up the middle of aus so it’s making me a little nervous

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Lincoln Landrover 0886821927 have been around for a long time.
They have a good reputation...knowledge, helpfulness & skill.

About 2 hours South of Streaky Bay.

Towing to The Alice with your problem would not thrill me.

Hope you get it sorted

Don

Originally Posted by 441

I have a 2011 D4 SDV6 and it's doing 'exactly' the same thing and has been doing it for the last few months. 108kph or less and ops normal. If I manually drive at 110kph or set cruise control to 110kph or higher it 'hunts' to maintain speed. It's not behaving as though it's just fluctuating around the set speed in a normal fashion. It really feels as though a fault somewhere is not allowing it to maintain a smooth, constant speed from above 108kph and it's definitely hunting and surging to maintain speed. Other occupants in the car can feel it and have asked if that's me driving poorly or the vehicle doing it. I too have had a complete transmission fluid flush and replacement with new filter and bottom pan by well regarded Ritters in Melbourne. It's just been in for an unrelated service and they did everything they could to identify the problem to no avail. No fault codes. If I'm towing, there's a light vibration felt throughout the vehicle at speeds above 104kph. Not sure if it's directly related to the above-mentioned issue or not but it began around the same time the speed 'hunting' issue began. Vibration only when towing. Different trailers makes no difference to vibration issue.

Remove your throttle body and give the throttle position sensor a good clean out from the inside. It may be gummed up and not be moving freely. This is especially true if you have not had the secondary turbo drain mod fitted.

If it is sticky it will cause surging as you describe but does not throw fault codes. Try it.

Just be gentle with the throttle butterfly, last you want is to damage the servo motor.