Thread: D4 surge while towing uphill

Originally Posted by rifi1

I believe if you leave the engine running when you connect your trailer plug it stops it from turning on, i might be wrong but the trailer indicator light doesn't appear when i connect this way.

ok tried this today and doesn't seem to work so i am wrong.Tried with engine off,running,door open,closed,didn't make any difference.

Cheers
Ric

Matt,
Can you post a picture showing the lever mounted on the shaft and what's between the lever and the casting? Mine has nothing to prevent grit from accumulating in the small gap but hopefully there's now some sort of seal to keep the gap clean.

Ric,
The picture I posted at the beginning of this thread and the term compressor shut-off valve (seems to be what its more commonly called) should be ample for your dealer to identify and check whether its the cause of your vehicle's problem. Its the whole assembly from the hose clamp at the bottom to 2 hose clamps at the top (1 just visible in the picture) including the vacuum chamber that operates the valve.

Originally Posted by Datt

The real test will come when I take the trailer for a spin up the beach as that was when it was at it's worst.

I have never had engine surging like behaviour on tar but have had it on the beach going up sand hills.

I have always put it down to DSC being left engaged. Are you turning your's off?

Originally Posted by Ferret

I have never had engine surging like behaviour on tar but have had it on the beach going up sand hills. I have always put it down to DSC being left engaged. Are you turning your's off?

That's because your steering wheel is not straight on LOL

Brett....

Little hard to get around the bends in sandy tracks when the steering wheel is pointing straight on

Ok, here is an update,Got back to Adelaide ok but problem has now slowly gotten worse and now does it on flat roads as well. Have been back to my purchasing dealer for first service and to try and fix the problem. Dropped car off for them to do the work. Later that day we decided to hook my van up to my mates disco 4 which is 4+ years old and never had a problem towing a similar sized van. It did the same thing so we immediately knew it was not a problem with the car. Now the fun starts. Have checked nearly everything on my van, driven it with and without trailer plugs connected, disabled breakaway unit, checked correct operation of brakes etc etc. Still not solved. Hooked up his van to my car and not a problem. Only thing not checked yet is to change the hyland hitch and see if it makes a difference.BTW my mate also has a hyland hitch on his van. Dealer could not find any problems and did all the checks suggested in this and other posts. Stay tuned.

What kind of suspension does you van have?

Originally Posted by mowog

What kind of suspension does you van have?

It has simplicity independent suspension with 12" brakes.