Cutting out issue.. continued

[Harryca]

Hey all,

So I've had an issue for a while with the van either cutting out, or attempting to cut out, with a momentary complete loss of revs and all the dash lights come on for a few seconds, then back to normal. SCV has been done, PRV working fine, all the learns have been done (so lets not suggest I do that please). I have no error codes associated with this issue.
Yesterday when driving the van went crazy, doing its attempt to cut out about 6 times in a row, rev counting bouncing up and down, van going along at 30mph with the clutch pressed in, dash lights coming on and going off like mad. Eventually when it stopped the engine management light was on and stayed on for the remainder of the 50 mile journey home. I plugged it in and read the codes on forscan as soon as I got home, hoping to finally find a code associated with this cutting out issue, giving me some indication of the cause of the issue I've been having, but weirdly the MIL was on for C004A - Brake lining wear sensor 13 - circuit open. I reset the codes and it's come back, but the light is no longer on.

Are these linked in any possible way? Any suggestions to what on earth could be going on? Or anything I can do to try and figure it out.

If you look at my previous posts you'll see a huge spike in actual fuel rail pressure when the van does its weird cut out thing, and a small spike in desired fuel pressure, along with an increase in the SCV voltage. I'm assuming this points to the cutting out being fuel pressure related, but with new SCV and a working PRV, and all the learns done multiple times successfully, is there something else that's causing this spike in fuel pressure that isn't the PRV and SCV? I don't really want to go through another £400 spend for genuine PRV and SCV just to guess it might fix the issue.

Long shot I know but any suggestions at this point are very welcome.

[knobby1]

Rev counter bouncing up and down could be a poorly crank sensor....is your cam/crank sync ok..?? Dash lights coming on and going off sounds like poorly earths, have you checked them all..?? There's a multitude of them on the Transits....especially the ones under the PCM on the left inner wing.

Lord Knobrot

[Harryca]

Rev counter bouncing up and down could be a poorly crank sensor....is your cam/crank sync ok..?? Dash lights coming on and going off sounds like poorly earths, have you checked them all..?? There's a multitude of them on the Transits....especially the ones under the PCM on the left inner wing.

Lord Knobrot

Cam/Crank sync is "No" with ignition on but engine off, then changes to "Yes" when cranking and engine running.
I've checked earths but I'm going to have to go through them all again and double check. I've changed some of the power feed relays in the engine compartment fuse box, but that's made no difference. Lost as to where to investigate next.

[Harryca]

Problem seems to be solved. Glow plug relay at top of engine bag fuse box had slight corrosion and was making poor contact. Relay pins cleaned up and bent slightly to make better contact, no more cutting out. I replicated the issue prior to fixing by wiggling the relay with the engine running and the engine would die, exactly how it would do whilst driving along. So far, seems to be the fix!