baloo
29-06-2007, 02:48 PM
Hi there, this is my first post and am at my wits end and really hopeful that someone out there can advise me on a misfire problem that i have had for a while now :confused:
The problem occured after adding diesel redex to the tank after i was getting smoke at startup (coincidence or not i'm not sure)
There is a set pattern to the problem now after driving the van for a few months while converting it:
1, if i start the van first thing in the morning and drive off immediatly then the van Fires on only 4 cylinders and doesn't clear even when warmed up.
2, if i start her up and let her tick over for just a couple of minutes then tickover smooths out and she runs fine if i just rev to about 2000rpm.
3, if taken on the motorway and driven at between 3 and 4000rpm for a few mile then she becomes rough (misfire) but if i pull off the motorway and pull over to the side of the road and just let her tick over for 4 or 5 minutes then she will drive great again if the rev's are kept down, smooth with no hint of a misfire.
4, and she has on the very odd occasion when driven hard run great and pulls like a train, running smooth. Once was when the AA came out and checked her over and was left ticking over for a good 25 minutes, she then ran perfect for a good 10 mile before the misfire returned :aargh4:
Basically, when i get the problem, i pull over and let her tickover, and the problem dissapears, but returns if driven above about 2000rpm.
So far, the van has been to one VW specialist (?) who had her for 3 days and said that there was no misfire! But on going out with the mechanic for a test drive, the van was far from running right, the mechanic thought the van "seemed to be ok"!
She comes back with no error codes (once when the AA plugged the van in and also at the above garage). I've also changed the fuel filter, air filter, return fuel pipes, MAF sensor and run her on a strong dose of FORT'E diesel injector cleaner for 10 mile up the motorway, i then filled the tank up and ran her with a slightly strong dose but no change.
I think it may be an injector playing up, lack of fuel pressure or fuel starvation to one injector maybe, as if i let her tick over she will run fine (if i don't rev over 2000rpm ( i can on occasions for a short burst rev higher, but any driving at higher revs (3 to 4ooorpm) brings the misfire back :banghead:
I want to take her somewhere where they can diagnose the problem, but am split between VW van center and a diesel specialist, if i knew it was an injector problem i would take her to a diesel injection specialist, but should I take her to VW and a possible bill that goes through the roof? :yikes:
Am hoping there is someone out there who can tell by the above symptoms what is most likely causing the misfire :1zhelp:
apologies for going on a bit here, and thanks for reading this if you got this far :beerchug:
Any help would be very much appreciated.
Baloo. (From the T4 forum)
The problem occured after adding diesel redex to the tank after i was getting smoke at startup (coincidence or not i'm not sure)
There is a set pattern to the problem now after driving the van for a few months while converting it:
1, if i start the van first thing in the morning and drive off immediatly then the van Fires on only 4 cylinders and doesn't clear even when warmed up.
2, if i start her up and let her tick over for just a couple of minutes then tickover smooths out and she runs fine if i just rev to about 2000rpm.
3, if taken on the motorway and driven at between 3 and 4000rpm for a few mile then she becomes rough (misfire) but if i pull off the motorway and pull over to the side of the road and just let her tick over for 4 or 5 minutes then she will drive great again if the rev's are kept down, smooth with no hint of a misfire.
4, and she has on the very odd occasion when driven hard run great and pulls like a train, running smooth. Once was when the AA came out and checked her over and was left ticking over for a good 25 minutes, she then ran perfect for a good 10 mile before the misfire returned :aargh4:
Basically, when i get the problem, i pull over and let her tickover, and the problem dissapears, but returns if driven above about 2000rpm.
So far, the van has been to one VW specialist (?) who had her for 3 days and said that there was no misfire! But on going out with the mechanic for a test drive, the van was far from running right, the mechanic thought the van "seemed to be ok"!
She comes back with no error codes (once when the AA plugged the van in and also at the above garage). I've also changed the fuel filter, air filter, return fuel pipes, MAF sensor and run her on a strong dose of FORT'E diesel injector cleaner for 10 mile up the motorway, i then filled the tank up and ran her with a slightly strong dose but no change.
I think it may be an injector playing up, lack of fuel pressure or fuel starvation to one injector maybe, as if i let her tick over she will run fine (if i don't rev over 2000rpm ( i can on occasions for a short burst rev higher, but any driving at higher revs (3 to 4ooorpm) brings the misfire back :banghead:
I want to take her somewhere where they can diagnose the problem, but am split between VW van center and a diesel specialist, if i knew it was an injector problem i would take her to a diesel injection specialist, but should I take her to VW and a possible bill that goes through the roof? :yikes:
Am hoping there is someone out there who can tell by the above symptoms what is most likely causing the misfire :1zhelp:
apologies for going on a bit here, and thanks for reading this if you got this far :beerchug:
Any help would be very much appreciated.
Baloo. (From the T4 forum)