Hey everyone, I'm new here, having had a fiesta van for year now. The engine has started smoking (black, clearly unburnt fuel), out of the exhaust under heavy acceleration, I've checked various things using Forscan, and it would appear that the Turbo/Injectors/DPF are all ok. I've rebuilt the inlet system, and the EGR Valve is also OK.

The fuel timing would appear to be an issue in as much as FORSCAN is recording as happening (inconsistently) after TDC particularly at lower revs.

Any thoughts? I'm beginning to get to the end of my tether with it.

Van has 60K on it, I have bought a timing belt kit but have yet to fit it (just thought as I'm pulling the thing apart anyway, I may as well). All filters and fluids have been changed recently.

appreciate any one else thoughts before I go completely loopy with it!!

thanks

Mike

 

How intermittent is that fuelling fault?  Post TDC injection is used for DPF regen.  The unburnt fuel ignites when it hits the hot cat in order to light the soot in the DPF.

Also black smoke is partly burnt fuel.  Unburnt fuel is white smoke.  Generally black smoke under load is as simple as a split boost pipe.  Maybe a smoke test through the boost pipework would show a split somewhere.

Hi TomsFocus

thanks for the reply, I’ve had the whole inlet system apart and thoroughly inspected it, no splits at all that I can see, and no leaks under boost.

i did a forced regen whilst I was at it, so the system shouldn’t be trying to regenerate, it seems to be fairly consistent in terms of the timing being out, there is a faulty exhaust pressure sensor, no fault codes, I’m waiting for a new (genuine) one to be delivered. I’ve been on this for weeks, it’s just as well I have no hair to pull out 🙂