by supadik » Fri Oct 11, 2019 10:42 am
I forgot all about this post lol. To update it, I can say that the problem didn't go away after the fuel filter change, although the new filter certainly helped. I still have the issue only much worse these days. The general running issue is flat spots. When the bus is 1st used on a morning the flat spots aren't too bad, after 10 mins or so they become more noticeable, by the time I'm nearly back home, say 2hr later, the bus is a real pig to drive. I have to change gear in such a way as to get the revs up before I release the clutch otherwise it flat spots and refuses to build up revs unless I dip the clutch, pick up the revs then slowly slip the clutch back out...or if the revs are already high-ish say 2.5k or more then shifting up a gear and being gentle with the throttle seems to help. Today, about 2 mins from getting back home I'd had to spend a few mins crawling to a round-about due to heavy traffic. As I tried to pull away from the round-about it really bogged down and wouldn't rev past 1200rpm. I limped it off the main road onto a local road, turned it off for maybe a minute or two while I checked the fault codes (same 2 I always have relating to the egr) then restarted and off it went driving relatively ok...still a bit fiddly to drive but kept up with traffic flow no problem. I'm pretty sure that it's the prv/scv that are fooked as years ago I was messaging Loot about the rough idle I had and he suggested it was probably a knacker prv and I could try doing a pump learn and pilot reset which I did and the idle was fine again. Obviously since then things have gradually gone from bad to worse but I've adapted the way I drive it to compensate...there never seems to be a long enough stretch of time that I can have it off the road to sort it out. When it's in mid-flat spot it will often "instantly" increase in power a bit then flat spot at that level of power then "instantly" increase in power again so I doubt it's turbo issues or anything of that type as the increase in power is like a switch being turned on. It really does feel like it's a valve on the fuel side that's sticking especially since it's had symptoms of a failed prv for years so it would seem reasonable to assume that the scv has also been faulty for years as well. Yesterday on the way home from the school run I popped the blue tooth odb2 dongle in and watched the fuel rail pressure using torque and it was all over the place and followed exactly the pattern of every flat spot, so hopefully that confirms the PRV/SCV as the culprit????
I have a school holiday at the end of October so that gives me 2 weekends and 5 weekdays where I don't need it on the road. I have new prv/scv and an egr in the garage (I have done for years lol) but they're not genuine!! Can anybody recommend an online source for a genuine ford prv and scv...also how much should I be paying for them. I'm not worried too much about the egr as it's a psv 1st used before July 2008 so it's exempt from that part of the MOT. Before the school holiday I'll do a leak off test and see what state the injectors are in as the bus must be close to 200k now on the original injectors lol. Having said that, with all it's issues and spending all it's time on country lanes climing up very steep hills and stopping and starting collecting/dumping passenger, it still manages 32mpg and never has a hint of soot or smoke so it's doing well considering it weighs 2800kg without passenger onboard!
So...what would be the best method of attack?
Start with a leak off test and replace injectors as required.
Then replace the PRV/SCV, prv counter reset, pump reset and pilot learn.
Then, if I have time, change the erg.
If I do have to change injectors is it worth making sure it starts and drives before going onto the next step of PRV/SCV so that I know I have them coded in properly or could the fooked PRV/SCV knacker the new injectors by running them over pressure?
Also I haven't used ids for years so I have no idea where these functions are...can anybody shed some light on that as well please.
I change mine every 5k, if the fuel can't flow the van can't go 
N
