Tue 8 Apr 2008 09:40 96 1.8td - occasionally revs up of its own accord - useless

every so often the engine decides it want to rev up all on it's own, you could be driving it and it just takes off like an apollo space rocket. Have been told it may be the pump and some suggest it's the turbo. what (if any) would be the best and cheapest way to find out what could be the cause Many thanks in advance {subject header amended to give a clue as to what question is being asked} Edited by Dynamic Dave on 08/04/2008 at 13:33 Reply | Report as offensive | Link

Tue 8 Apr 2008 09:47 1996 1.8td - Carse

It could also be the clutch slipping, have you noticed any changes in the biting point? Carse Reply | Report as offensive | Link

Tue 8 Apr 2008 10:33 1996 1.8td - useless

not clutch this engine revs right up if you dip clutch and have to kill engine before it blows Hope this helps Reply | Report as offensive | Link

Tue 8 Apr 2008 12:12 1996 1.8td - Peter.N.

If its done a high mileage it could be running away on sump oil vapour due to bore wear. Will it stop if you switch off? if not, that's what it will be Reply | Report as offensive | Link

Tue 8 Apr 2008 12:17 1996 1.8td - useless

Yes it stops when turned off, then restart it it's fine then maybe few days later it may happen again car only done 76000 miles Reply | Report as offensive | Link

Tue 8 Apr 2008 13:24 1996 1.8td - Screwloose

Check the oil level. Reply | Report as offensive | Link

Tue 8 Apr 2008 13:49 1996 1.8td - useless

oil level bang on the mark having just serviced it, but it was doing this before servicing Thanks Reply | Report as offensive | Link

Tue 8 Apr 2008 14:13 1996 1.8td - Screwloose

useless Find the little round aneroid unit on the lower front of the injection pump [gold tin cover] and remove it's rubber hose with the sprung clip. Is there any sign of diesel in that hose, or dripping from the aneroid unit? Reply | Report as offensive | Link

Tue 8 Apr 2008 17:45 1996 1.8td - Peter.N.

Well that's a good sign! Could be that air is getting into the fuel system. If possible replace the last section of fuel pipe to the pump with clear plastic and watch for air bubbles. You could have aleak anywhere in the fuel line or it could be at the filter. Has the filter been changed recently? if yes, it may not be sealing properly, if no, try changing it. Reply | Report as offensive | Link

Tue 8 Apr 2008 18:19 1996 1.8td - Screwloose

Peter I've always found it a sign of leaking diaphragms in the aneroid unit. It pushes low-pressure diesel back up the metal boost-pressure pipe to the inlet manifold - a common cause of runaways on these. Reply | Report as offensive | Link

Tue 8 Apr 2008 20:52 1996 1.8td - useless

would that be the pipe from the pump back to the turbo? i ask this as i know there is fuel in that pipe as it had a leak again thanks for the help Reply | Report as offensive | Link

Tue 8 Apr 2008 21:09 1996 1.8td - Screwloose

useless Yes; it goes to an elbow on the turbo housing just before the intercooler - mostly steel, but with a soft rubber section at each end. It should only have air in it. If diesel is present; then the diaphragm in the aneroid unit has split. A new unit is around £90 from LSUK - it may be supply and fit only as the unit should be re-adjusted afterwards. Diaphragm kits are available - but not easy to fit. Reply | Report as offensive | Link

Tue 8 Apr 2008 21:34 1996 1.8td - useless

brilliant thanks for that Reply | Report as offensive | Link

Tue 8 Apr 2008 23:25 1996 1.8td - Peter.N.

Hi Screwloose I wouldn't disagree with that as I am not familiar with the pump used on the Ford engine. As you will probably have noticed, most of my fault finding relates to Citroen/Peugeot set ups, but I'm learning from you all the time! Reply | Report as offensive | Link

Wed 9 Apr 2008 09:44 1996 1.8td - useless

I must admit i found it odd that there was fuel going to the turbo Reply | Report as offensive | Link

Wed 9 Apr 2008 17:46 1996 1.8td - useless

Ok been in touch with LSUK and as Screwloose predicted it is the aneroid unit (they called it a boost unit) lol they told me what the car was doing so i reiterate my thanks for a spot on diagnagnostic (i wish i could spell) Edited by Dynamic Dave on 09/04/2008 at 17:53 Reply | Report as offensive | Link

Wed 5 Nov 2008 16:29 1996 1.8td - siddy

Had the same symptoms - spontaneously reving up (always accompanied by a loud clicking?). Anyway - again, found diesel in the hose connecting to the aneroid unit to the inlet unit so thanks to Screwloose. Too often in forums once someone has found the solution they don't bother posting back a positive resolution so cheers to everyone. Reply | Report as offensive | Link