GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: Helios_Blue_Valver on 06 December 2003, 15:48
-
For some reason I am having a problem with my 89 valver wanting to over fuel. My fuel milage is down to 27 mpg from the 32 it was getting about a month back. Idling I can smell fuel in the exhaust while standing by the drivers door. No fuel leaks or anything. Blubbers a bit on the top end of the revs and seems down on power a bit. What do I need to be looking at here. I changed the plugs, wires, cap and rotor about 2 weeks back. Cleaned the K&N about a week ago. It's bad enough where my mate was standing out front of work when I pulled up the other day and he could smell petrol. Any ideas.
-
Fuel leak (damaged pipes)?. Mine used to overfuel soo much till i sent it in for the mixture to be adjusted. It was way out.
I also tightened the hoses near the inlet manifold i think it is? to stop the fuel leaking.
Before you run the car, give all the hoses, parts a good clean.
Then run the car and sniff for fuel and look for leaks.
I was told that mk2's fuel lines get brittle over night in the freezing cold.
-
I've totally been over the car, no fuel leaks any where. Exhaust smells really stron of petrol though.
-
must be a air/fuel mixture problem. Get it tuned and see how it goes :)
-
mine runs over fueled! not much i can do about it as the ecu sets it. i think its better to run rich and to run lean!
-
Use a gunston colortune or a co tester, quite easy to set up at home.
-
Use a gunston colortune or a co tester, quite easy to set up at home.
thanks mate. I'll have a look around for one. What am I looking to do as far as set up. not messed witth the injection these much.
-
You can buy the bits from Halfords. I like the spark plug colortune, as this is quick and easy to use. Plug it in place of the spark plug and watch the colour of the burn, at operating temp it should be blue with small tints of orange in it. The co adjustment screw is by the metering unit. Its better to use the colortune when its getting dark as its easy to see it!
-
Cheers I'll give it a go. I thought of buying an air/fuel mixture gauge and mounting it on an a pillar pod but that seems a little fast and furious for my taste. :)
-
You can make your own air/fuel meter. I have one in my car, you will have to fit a lambda sensor in the exhaust. Found the circuit diagram on google, parts from Maplin, about ?10 to build.
Steve.
-
sounds pretty cool. I though of buying one and them mounting it under the bonnet so i could see it when tuning. I would be interested in seeing that article if you remember where it was. thanks :)
-
http://scirocco.dyndns.org/tech/misc/afgauge/af.html
This is similar to the one that I made, works v.well.
Steve.
-
sounds pretty good. Maybe I'll have a go and see if I can mount the display in one of the block off plates. :) Thanks for the plans.
-
ahah, just come across this post by accident! super stuff but which O2 probe thing? how do i fit the probe to my mk1? do i need to drill and tap a hole in the exhaust manifold?
-
somebody make me one!!
im a total nightmare with electronics!
-
I'm having a go :-\ coming on okish will let u laugh at finished thing (only word to describe it is thing lol)
-
I used a s/hand sensor fron the scrap yard. Black wire is the signal, the grey is earth and the white wires are for the heating element (used to bring the sensor up to temp quicker).
The first one I made I used a 4 wire sensor and didn't connect the heater, worked fine.
-
Don't need to drill the manifold, find a nut the same thread and drill a hole in the front pipe at a convienient place (as close to the manifold as you can) and weld the nut on.
Steve.
ps, I will take a picture of mine and post it in the gallery when I get time.
-
Come to think of it I have a new ox sensor sitting in my tool chest. Bought it for one of my cars and never installed it. bonus! Now I just need to scrounge the rest of the parts and I am in there.
-
http://www.golfgtiforum.co.uk/gallery/displayimage.php?album=lastup&cat=10367&pos=0
Picture in the gallery, don't look to hard at the wiring it is is temp while I am setting up the engine ;D. Guage on the left is the boost guage, went for the (cheep) industrial look ;).
Steve.
-
Two things you should check , 1 ,the injectors are held in place with small rubber rings . which go brittle and crack , with age , allowing air to be sucked in ,past the injectors causing a weak mixture .
2 , the injectors are still under pressure , when the engine isnt running . sometimes fuel leaks out , causing difficult starting ,and increased fuel consumption .
-
looks like it works the treat though. I best get on building one I suppose. Where did you source your parts from?
I think I have it sorted out now. I used a colortune as '6 suggested and it was pretty easy. I cleaned my K&N and then had at it. Seems to run better I'll give it a week and see what develops.
-
The colortune is sh!t hot, no one would believe me :'(
Its such a simple but effective idea. I would recommend sticking a co tester on as well if you can.
-
All the parts for the meter were from Maplin electronics, chip, socket, led's,resistors, circuit board and the box all for about a ?10 ;D.
Steve.
-
Yeah but you are just too good Steve :-*
-
Had to do something, could'nt read the colour tune easily while doing 6k revs @ 8psi ;) ;).
Steve.
-
imagine not. lol. I'll get after ordering the bits then
-
For normal factory car or slightly modded, set the fuel/air mixture up at idle is perfectly adequate. Infact that is exactly what VAG specify from factory. If your car is like steves then its probably best to get it on a rolling road.