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[Jim]

As header,
I was driving down from Scotland tonight heading for Gloucester(340 Miles) and after 280 miles no problems, I had the cruise set at 70mph on the speedo (about 67mph on the sat nav) sitting at 2500rpm and the car started to judder and the rev counter shot up and continued to judder after a few seconds the rev's dropped to 3500rpm and was still juddering, I switched off the cruise control and reduced the speed and the juddering stopped. I then increased the speed slowly and it was OK, after a few miles the car would give a little judder and then carry on as normal.
The car has done this a few times now, I changed the fuel filter after the first time it did it, but no change!!

Any ideas???

Also when the car is sitting idling the revs seem to flicker

[feeutfo]

Any dash lights come on? Pedal tricked for fault codes as the guide?

Weird one.

[tango]

Could be anything
If the eml comes on you can check for codes

[Jim]

I'II check the codes later today and post them up here.

[Kevin Wood]

Given that the rev counter was doing odd things, I wonder if the crank sensor is on its' way out?

[dbug]

As header,
I was driving down from Scotland tonight heading for Gloucester(340 Miles) and after 280 miles no problems, I had the cruise set at 70mph on the speedo (about 67mph on the sat nav) sitting at 2500rpm and the car started to judder and the rev counter shot up and continued to judder after a few seconds the rev's dropped to 3500rpm and was still juddering, I switched off the cruise control and reduced the speed and the juddering stopped. I then increased the speed slowly and it was OK, after a few miles the car would give a little judder and then carry on as normal.
The car has done this a few times now, I changed the fuel filter after the first time it did it, but no change!!

Any ideas???

Also when the car is sitting idling the revs seem to flicker

Misfre? - check plugs, leads and maybe DISS pack

[twiglet]

As header,
I was driving down from Scotland tonight heading for Gloucester(340 Miles) and after 280 miles no problems, I had the cruise set at 70mph on the speedo (about 67mph on the sat nav) sitting at 2500rpm and the car started to judder and the rev counter shot up and continued to judder after a few seconds the rev's dropped to 3500rpm and was still juddering, I switched off the cruise control and reduced the speed and the juddering stopped. I then increased the speed slowly and it was OK, after a few miles the car would give a little judder and then carry on as normal.
The car has done this a few times now, I changed the fuel filter after the first time it did it, but no change!!

Any ideas???

Also when the car is sitting idling the revs seem to flicker

Misfre? - check plugs, leads and maybe DISS pack

Coil packs on a 3.2    I'd expect them to throw up a code if they were failing.

Just wondering if it could be gearbox related, since you say the revs shot up at the same time.  Maybe getting stuck between gears? 

[Kevin Wood]

Are the engine revs changing or just the rev counter?

Agreed, gearbox if the revs change. Could be low fluid or a poor connection between box and ECU. Would expect a gearbox warning in that instance, though.

[albitz]

Cruise set at 70 - not much gearchanging taking place. My moneys on crank sensor.

[Jim]

Are the engine revs changing or just the rev counter?

Both, the engine revs shoot up

Agreed, gearbox if the revs change. Could be low fluid or a poor connection between box and ECU. Would expect a gearbox warning in that instance, though.

No warning lights and nothing on the digital screen

[Webby the Bear]

I have had this and it was a misfire 

Someone will diagnose correctly though I'm sure 

[feeutfo]

Are the engine revs changing or just the rev counter?

Both, the engine revs shoot up

Agreed, gearbox if the revs change. Could be low fluid or a poor connection between box and ECU. Would expect a gearbox warning in that instance, though.

No warning lights and nothing on the digital screen

Any codes though? Whats crank sensor in obd2 0335 or sumat like?

[Jim]

Are the engine revs changing or just the rev counter?

Both, the engine revs shoot up

Agreed, gearbox if the revs change. Could be low fluid or a poor connection between box and ECU. Would expect a gearbox warning in that instance, though.

No warning lights and nothing on the digital screen

Any codes though? Whats crank sensor in obd2 0335 or sumat like?

Not yet, I've been at work all day, hopefully get them tomorrow.

[Stallion]

Are the engine revs changing or just the rev counter?

Both, the engine revs shoot up

Agreed, gearbox if the revs change. Could be low fluid or a poor connection between box and ECU. Would expect a gearbox warning in that instance, though.

No warning lights and nothing on the digital screen

Any codes though? Whats crank sensor in obd2 0335 or sumat like?

Yup it's 0335!

[Kevin Wood]

Does it feel like the autobox is changing down deliberately or losing drive? Could be fluid level causing the TC to slip or the box to drop out of gear.

Alternatively the engine could be losing power to a misfire, fuel starvaton, etc, and it is changing down to try to maintain the set speed. Really need to try to reproduce it during manual driving to get a feel for if it's losing power.