Hi fellas my focus cuts out at low revs when driving, loses power then glow plug light comes on. It doesn't cut out all together it just ticks over and won't rev. Only seems to do it at small throttle openings or when driving along at constant low revs. Starts up straight away after switching ignition off & restarting but problem re occurs. These recent cold mornings have made the problem worse can't get it off the drive. No fault codes on the dash.  Replaced diesel filter, air filter, blasted egr valve with Wynn's cleaner and cleaned maf sensor with a bit of spray electrical cleaner. Any ideas? 

6 hours ago, Arthur grahams socks said:

my focus cuts out at low revs when driving, loses power then glow plug light comes on. It doesn't cut out all together it just ticks over

Accelerator pedal sensor?

This is usually a dual redundant system. If there is a difference between the two sensors, it will probably use the lower reading, and set an error code to turn on the warning light.

If it was low fuel pressure at low rpm, then I would expect starting problems, as that is only 200 rpm. I can't at the moment think of another cause.

There should be some error code(s). The dash error displays are usually very limited. As this is a 2000 diesel, it may be pre-OBD2, so many standard scanners will not work. But Forscan with a good ELM327 has been found to work on other pre-OBD2 cars. This system is by far your best bet to read any codes that may be present. And it can test & monitor various sensors & readings.

-----

Forscan is a powerful Ford specific system, Cost £15.00 for the interface. Needs a computer of some sort. (COM port, USB, Bluetooth or WiFi interfaces available). You will find a lot about ELM327 & Forscan on this site, which together provide a very comprehensive diagnosis & maintenance tool. James (jeebowhite) has done a nice guide: http://www.fordownersclub.com/forums/applications/core/interface/file/attachment.php?id=21196

Forscan works best on a Windows laptop, with a USB ELM. The Tunnelrat one (below) has been reported to work well by several people. Forscan is also available for iOS & Android for some tablets & phones,

For a USB ELM327 adapter, see
http://www.spanglefish.com/TunnelratElectronics/index.asp?pageid=516992

Wireless ELMs are also available (bluetooth & WiFi), but are often not as reliable as the wired ones. I suspect they may be a bit less likely to work in the pre-OBD2 cars, then USB.

For an bluetooth wireless ELM, which one user at least says works with Forscan, see the KW902: http://www.ebay.co.uk/itm/ELM327-KW902-Bluetooth-Scaner-OBD-Link-OBD2-Diagnose-Interface-Tester-white-UK-/281631334205

The Forscan programme is free (in Windows format) and you can get it from:
http://forscan.org/download.html

 

Thanks Peter, I'll try this route. 

Fitted another pedal & sensor yesterday. Everything back to normal. Many thanks Peter