VW TDI forum, Audi, Porsche, and Chevy Cruze Diesel forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
181 Posts
Discussion Starter #1
So after about a year trying to daignose a low power issue on my wife's 2002 Golf, I get nowhere.
Today before heading out on a 90 km trip to Toronto, I did a fuel filter change and a DieselPruge, first one in over 200,000kms since new.
All seemed well, no bubbles, no troubles right, on we go.
On the return trip car felt like turbo was wide open and really no boost or power, but no MIL's or anything.
When I got home I dug inot it a little deeper, found the clear fuel supply line looked like MILK, not right. Immediately I suspect the fuel filetr I had just replaced, maybe it was defective???
Looked at the seals, pulled all the air out with hand vac pump, cracked the injectors, I could not get fuel.
Finallyt pulled out some fuel line I had purchased for my '71 SuperBeetle and what do you know it's the same size!! Install new lines(supply and return) prime the pump, bleed the lines and fires right up. POS fuel lines were dried out.

I did replace the VAC lines, Fuel Temp Sensor, ceaned the intake, reduced the EGR function with VCDS, cleaned the EGR and ASV, confirmed the VNT actuator,the list goes on.
Hope this is the last step and the turbo isn't pooched.:dunno
 

·
Registered
Joined
·
181 Posts
Discussion Starter #3
The fuel lines at the injectors? Was it air that made it look like milk and did it fixyour limp mode?
As soon as I pulled the inlet side of pump,(the CLEAR hose), it came off dry as in no fuel but looked aged as well.
As for limp mode??
The power did come back to normal and still no MIL's, but my laptop decided it didn't want to play nice and wouldn't boot up for me, can't win today.
I'll keep you posted though.
Thanks for asking.
 

·
Registered
Joined
·
181 Posts
Discussion Starter #4
After dumping and reinstalling the OS for my laptop and got it ot work again, I turned down th IQ to about 3.8mg/str.
Unfortunatly I can no longer see the fuel in the line as it is now a braided line.
Car does fire up no issues, runs well but sttill feels slightly under powered. I also took the N75 valve off and cleaned it out with brake cleaner and verified its function with VCDS and does in fact work.
I tested the VNT actuator with hand vac and it did hold roughly 16"-17" hg
and still no MIL's present.
Maybe when it warms up I'll have to check the srotke length and movement.
 

·
Super Moderator
Joined
·
23,902 Posts
I assume you checked the MAF and snowscreen? It's possible it's only at 80% or the snowscreen is clogged with leaves or birdsnest, causing all the intake air to come in through the spring loaded bypass.
 

·
Registered
Joined
·
181 Posts
Discussion Starter #6
Snow screen is gone,MAF was swapped with no change, I still think I'm pulling in air somewhere, but hard to tell.
 

·
Registered
Joined
·
181 Posts
Discussion Starter #7
Update

Had a good going over the fuel system today, and finally got to the bottom of things.
Turns out the Case Pressure Relief Valve had the bushing slipped out, 2 min fix after being told the pump needs to be replaced.
Cha Ching $800 saved in my pocket, car runs like a champ now with new injectors.:thumbsup
 
1 - 7 of 7 Posts
Top