As above I’ve been slowly restoring an 8v gti digi. It’s never started right since I’ve had it Done some work and had it running but just seems really rich and stinks the street out Pulled plugs after a failed start and they are soaked in fuel. Just to add there is a spark at all plugs I’ve already checked Why so much fuel at start up I don’t get it. Car is quite close to being finished but isn’t drivable which is quite annoying after all the work I’ve done . Your thoughts I’m at a loss in gonna check for leaks etc again around vac lines Dodgy regulator maybe would this happen if this was the case.thanks
Already replaced that.but did discover today When I removed large rubber intake pipe there was petrol in the throttle body and that rubber pipe.also smelt of petrol in the vac line from fuel pressure regulator.so I think this could be my problem fingers crossed.
Have you got a good vacuum to the pressure regulator ? , you could try cleaning your plugs ,start the engine then disconnect the plug to the cold start injector and see if the richness go's away . Good luck cheers.
No ,was talking about dijifant ,k-jet hasn't got a pressure regulator on a fuel rail like the EFI motors ,that is what he mentioned as he thinks its faulty, strange reply really as I can't understand your confusion ??.
Yes, that makes sense if the regulator has a ruptured diaphragm it will leak into the throttle body ,jumper the pump relay to run constant with key on and see what comes out of the vacuum line ,on reflection think you are right with dead right ,see how you go ,cheers.
I've probably seen 3 failed regulators where they have passed fuel through the manifold reference line. I run a clear vacuum pipe to check.
So I’m thinking if the regulator is passing fuel Into air intake that’s gonna be fuel through injectors plus another air/fuel mix from air intake going to very rich. Also if it’s failing and putting fuel through the vac line does this mean the fuel rail wouldn’t be at the right pressure also to deliver right spray to injectors. This could be the silver bullet to all the issues I’ve been having. I also noticed on previous mot,s going back to 2014 this car has failed a couple of mots to high readings on emissions.hasnt actually been on the road since 2019.but this problem Would surely cause emission test problems? Not many more jobs be nice to actually drive it rather than work on it.
It would depend on how bad the regulator is leaking ,expect there would be a drop in pressure. Because it is raw fuel and is fouling the plugs don't think it was pass test,besides further driving will bore wash the engine and dilute engine oil..petrol is a lousy lubricant after all . I had a motor (not VW ) that bore washed and it beat out the piston ring lands and broke 6 rings ,the bores were also worn out . Do the vacuum line test but think you should replace the regulator ,cheers.
Ok just hope I haven’t bore washed and ruined the rings.i will have to see when sorted.would be a real set back as I’ve already had the engine apart for a head rebuild valves,stem seals etc. Only positive is (if it has to happen)at least it’s all new bolts and would be quick to strip down. Oil is new not even driven with it but is fuel contaminated I can smell petrol in the oil.
Fuel in the oil is a red flag so likely it is leaking a lot fix ,it and put fresh oil in after the repair ,ok ?.
Yes think it could be ok had the head off for rebuild bores looked ok still had factory hatch marks on (faint but could se em) rings hopefully will be ok. The car has never been driven by me yet it has stood for at least 5/6 years the diaphragm was poss leaking years ago but I had this car started after build and seemed hard to start but the last time it started was different very hard to get going and really rancid.
Update changing the regulator and is like a different car the difference is night and day. Although couldnt set timing as another worn out part (the fan)..cut in and well I’ve never heard anything like it so something else to change.
Well done ,did you check the vacuum line for fuel leakage...would be interested to know ? ,have you done an oil change ,cheers.
Yea the vacuum line was leaking into the intake so there’s one problem.and maybe pressure was all to cock as well.put on a new water pump (unrelated problem)drain oil and it was thinner than it should be and stunk of fuel.new oil was a must like you said.the car has never really been upto a temp where I can set timing but had to stop at this point as fan sounded terrible so got another coming. Car has stood for around 6 years and most parts have or will be changed.not much in the engine bay is old now.just gonna change all the brakes and brake fluid and get a mot. Been a bit more work than I thought tbh but nearly there
