P36 DSE misfire cured !!!

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nisbeam

Active Member
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201
Location
down in Cornwall
After 3 garages gave up (one a RR specialist) I had replaced lots of parts in an effort to cure the misfire. Of course Testbook & Faultmate said speed sensor invalid value - well it was because of the misfire. Eventually the head cracked so I have now replaced that. All back together & still had a misfire but working out the only thing left, I have now cured it and done 800 trouble free miles in all condition, fast slow etc. I fixed it with this :eek: Halfords | Maintenance Fluids & Additives | Lubricants | Engine Degreaser
moz-screenshot.png

By the way, the reconditioned head was just over £500 exchange and came complete & rebuilt with new valves, springs & cam all built ready to go from Cylinder Head

Hope this info may help someone. Now to chip it ;)

Oops - I meant P38 of course
 

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nisbeam said:
After 3 garages gave up (one a RR specialist) I had replaced lots of parts in an effort to cure the misfire. Of course Testbook & Faultmate said speed sensor invalid value - well it was because of the misfire. Eventually the head cracked so I have now replaced that. All back together & still had a misfire but working out the only thing left, I have now cured it and done 800 trouble free miles in all condition, fast slow etc. I fixed it with this :eek: Halfords | Maintenance Fluids & Additives | Lubricants | Engine Degreaser
moz-screenshot.png

By the way, the reconditioned head was just over £500 exchange and came complete & rebuilt with new valves, springs & cam all built ready to go from Cylinder Head

Hope this info may help someone. Now to chip it ;)

Oops - I meant P38 of course
Click to expand...

Think someone said it maybe a sticky injector long long ago.
 
Yes but it wasn't that - I put some injector cleaner through when that was first mentioned. In fact I tried two lots and have also been running on Shell V-Power as recommended elsewhere.
It was water in the fuel - the stuff I tried this time was Dry Fuel :) and after about another 50-60 miles there was a big difference and it remains smooth now. Of course the question is how it got there, but the car had only done 114,000 when I got at 12 years old so I guess it may have sat around for a while. I had changed the filter & didn't notice water in what came out but there you go :doh: I knew it had to be something 'simple' - just difficult to find what it was.
It's great to have the lovely car back on the road. Just ordered a PSI Power Box, so looking forward to fitting & hopefully better performance & consumption.
P.S. back to normal running - now the Bonnet Open warning is stuck on - ha ha :)
 
nisbeam said:
Yes but it wasn't that - I put some injector cleaner through when that was first mentioned. In fact I tried two lots and have also been running on Shell V-Power as recommended elsewhere.
It was water in the fuel - the stuff I tried this time was Dry Fuel :) and after about another 50-60 miles there was a big difference and it remains smooth now. Of course the question is how it got there, but the car had only done 114,000 when I got at 12 years old so I guess it may have sat around for a while. I had changed the filter & didn't notice water in what came out but there you go :doh: I knew it had to be something 'simple' - just difficult to find what it was.
It's great to have the lovely car back on the road. Just ordered a PSI Power Box, so looking forward to fitting & hopefully better performance & consumption.
P.S. back to normal running - now the Bonnet Open warning is stuck on - ha ha :)
Click to expand...

That is very interesting. How does a chemical remove water from the fuel? Would like someone to explain how that's done. 10 gallons of fuel 10 gallons of water one bottle of Dry fuel and you have 20 gallons of usable fuel presumably. Could be the answer to the fuel prices. :D:D:D
 
I agree it sounds impossible and I expect it is - it can't really dry the fuel, but whatever it did do worked. I would love to hear from Wynns as to how it works and what it really does :eek:
Incidentally, before I fitted the new head I cleaned the injectors thoroughly and they were shining before I refitted them. After the rebuild I did 60 trouble free miles before the 'misfire' occurred again. At this point I thought it had to be fuelling in some way, so began to think again.
 
nisbeam said:
I agree it sounds impossible and I expect it is - it can't really dry the fuel, but whatever it did do worked. I would love to hear from Wynns as to how it works and what it really does :eek:
Incidentally, before I fitted the new head I cleaned the injectors thoroughly and they were shining before I refitted them. After the rebuild I did 60 trouble free miles before the 'misfire' occurred again. At this point I thought it had to be fuelling in some way, so began to think again.
Click to expand...

Think it maybe a combination of all the injector cleaner you have used and the dry fuel stuff unsticking a sticky injector. Very unusual for a diesel to miss other than a sticky injector or a sticky valve. If there was water in the fuel it would affect all the injectors and the engine would run like a bag of spanners. A slight miss on one cylinder cannot really be down to water in fuel. But there you go, would be interested in the Wynns spec sheet on Dry fuel.:D:D
 
wammers said:
That is very interesting. How does a chemical remove water from the fuel? Would like someone to explain how that's done. 10 gallons of fuel 10 gallons of water one bottle of Dry fuel and you have 20 gallons of usable fuel presumably. Could be the answer to the fuel prices. :D:D:D
Click to expand...
Maybe it causes a chemical reaction and turns the water into oxygen and hydrogen:hysterically_laughi
 
nisbeam if you get your misfire again as it does sound like a sticky injector iam only in burbage nr marlborough and i have a couple of spare injectors you could borrow to find the offending one!
 
dry fuel is basically an alcohol (heptanol I think) - its effectively a surfactant (like soap, a bit) one end of the molecule mixes with water, the other with oil/fuel - so dry fuel manages to dissolve the water in the fuel.
 
jonbill said:
dry fuel is basically an alcohol (heptanol I think) - its effectively a surfactant (like soap, a bit) one end of the molecule mixes with water, the other with oil/fuel - so dry fuel manages to dissolve the water in the fuel.
Click to expand...

Do i take it that if i put half a bottle of Bells whisky in the tank it will have the same effect then. I got some for christmas and have been using it for screen wash as it's not fit to drink. :D:D:D
 
wammers said:
Do i take it that if i put half a bottle of Bells whisky in the tank it will have the same effect then. I got some for christmas and have been using it for screen wash as it's not fit to drink. :D:D:D
Click to expand...

bells:puke::puke: nasty **** see my whisky/whiskey thread

ben bracken tonight
 
sadly the bells won't work. Its already mostly water. Might work in the screenwash though.

Meths and white spirit don't work either.
 
Well, it's still OK. and.... just fitted a PSI Powerbox 2 - WOW, what a difference it now flies as well. Have to wait for the MPG but very impressed with the power change.

Just wanted to post some good news for a change !!!
 
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