300tdi running rough

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C

colinl

New Member
Posts
417
Location
ashton-under-lyne lancashire
Hi all, for the last few days my 300 tdi has not been starting very well! It seems as though the diesel is feeding back overnight or when stood for a few hours.Once it has been started it runs as though its on 3 cylinders but then clears itself and seems to run as normal although the tickover is very slightly uneven.Any help or suggestions would be appreciated!!
 
Thanks for replying! not sure but i dont give it any heat as its always started ok.I will get the meter out and test them before i spend any cash on the wrong thing as i was not sure whether it was the fuel filter or sedimentor.
 
Shouldn't need glowplugs and you say you don't normally too so I'd forget that for now, stick a new fuel filter on and clean the secimentor and then see what it does...
 
i dont think mine has a MAF due to it only being a 94 manual 300tdi as it hasnt even got the position sensor on the top of the pump.Does anybody not think it could be a leaky injector coz when your moving it runs spot on and doesnt smoke and it is only affecting the starting after being stood for a while and also the revs are slightly up and down on tickover?
 
whats the state of the leak offs ?

dont suppose it's rattles a bit ? - worth changing the injector sealing washers as part of the process of elimination, quick to do and washers are 10p each
 
colinl said:
hi, leak offs are spot on but does sound a bit rattly as though the timing is out?
Click to expand...

it's worth checking if the plastic leakoff tubes are a very tight fit on the unions, they tend to get brittle with age

injector sealing washers also get brittle and can give the impression that it's time to get yer feeler guage out or that the brake vac pump is on it's way out - has the IP ever been played with to your knowledge ?

but do the easy simple things first
 
HI, I would start by looking at the fuel pipe that goes from the fuel filter to the fuel lift pump. Just around the fuel lift pump, cracks appear and let in air into the fuel system! You will need to replace the fuel lift pump in this case.
Hope that may help you.
RRC :)
 
The pump has been played with but the fault was there before it was touched.I can easily return to the original settings but it does run better with the pump the way it is as before it was gutless and it produces no excessive smoke.
 
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