Excessive fuelling on 2.0 8V coupe

Timo · 12-11-10, 06:46 PM

As above, my newly acquired 1996 2.0 8v coupe seems to be using excessive fuel.

I ran the tank to empty yesterday then put £5 in, drove to coxy's and back today (very carefully) which is a round trip of 22 miles and the tank is empty again! So the car is doing about 22 miles per gallon if I nurse it which is well below book figures, not only that it seems worse than my old 16V and coxy's 20V!

Weirdly the car does not smell excessively of fuel when its idling as you might expect if there was a leak or was running rich. Also I've checked the air filter in case that was blocked and causing havoc with the MAF sensor but that looks nice and clean.

If anyone has any suggestions on what to check next that would be great as I'm a little unsure where to look next.

Cheers

Tim

Coxy · 12-11-10, 06:53 PM

Drop the 16v in!

rich.r · 12-11-10, 06:54 PM

is it possible you are actually losing fuel from some where maybe filter or similar as opposed to running rich

Timo · 12-11-10, 06:55 PM

Quote:

Drop the 16v in!

Might do at this rate, problem is its missing a few bits now! Also if I did drop the 16V in would I have to go back to a CAT exhaust for the emmisions test as the 16V was a 1993 and the 8V is a 1996?

Timo · 12-11-10, 06:58 PM

Quote:

is it possible you are actually losing fuel from some where maybe filter or similar as opposed to running rich

Its possible but as I say the car never smells of fuel and I've never noticed any leaks on the ground where its parked.

The fuel pump does have a slight whine but I'm not sure this is of any significance.

rich.r · 12-11-10, 07:03 PM

Quote:

Originally Posted by Timo

Its possible but as I say the car never smells of fuel and I've never noticed any leaks on the ground where its parked.

The fuel pump does have a slight whine but I'm not sure this is of any significance.

if your loosing it when its running/moving you wouldnt notice it so much and the wind would push smells away from you

Timo · 12-11-10, 07:13 PM

Hmm, you might have a point but wouldn't it be losing it when stationary too?

SkinnyMan88 · 12-11-10, 07:15 PM

Mine used to run at about the same mpg, pretty much exactly the same! And I never smelt any excessive fumes or anything but changed the lambda sensor and started getting around 35 mpg.

The old one was black as anything, no wonder it wasn't working! Might be worth a look.

Also, the cold start valve / fifth injector stick open aparently. You just need to warm the engine up, pop it out and plug the hole then turn the engine back on, it shouldn't release any fuel when warm.

Hope that helps

Timo · 12-11-10, 07:19 PM

Thanks Skinny man, will take a look at both those suggestions.

SkinnyMan88 · 12-11-10, 07:26 PM

Problem is, the injectors are pricey (around the £100 iirc

) but easy to fit. The lambda sensor is less so (I paid about £60 I think) but a ballache to fit lol.

The cost is offset in what you save on fuel though, at least

Good luck, hope you get it sorted.

12-11-10, 07:13 PM	#7
Timo Grown up member Classic Audi Club Member Join Date: Jul 2007 Location: Shropshire Posts: 352	Hmm, you might have a point but wouldn't it be losing it when stationary too? __________________ 2000 Audi A4 1.8T sport avant (family wagon) 1996 Audi Coupe 8V Byzanz purple (gone to a new home oop north) 1994 Audi Coupe 16V Amethyst pearl (gone but not forgotten) 1969 Burgundy 912

12-11-10, 07:19 PM	#9
Timo Grown up member Classic Audi Club Member Join Date: Jul 2007 Location: Shropshire Posts: 352	Thanks Skinny man, will take a look at both those suggestions. __________________ 2000 Audi A4 1.8T sport avant (family wagon) 1996 Audi Coupe 8V Byzanz purple (gone to a new home oop north) 1994 Audi Coupe 16V Amethyst pearl (gone but not forgotten) 1969 Burgundy 912

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12-11-10, 06:53 PM	#2
Coxy 4 Ring Mafia Classic Audi Club Member Join Date: Jul 2007 Location: on the side of a hill in Shropshire! Posts: 28,215	Drop the 16v in!

12-11-10, 06:54 PM	#3
rich.r Senior Member Join Date: Jul 2010 Posts: 1,832	is it possible you are actually losing fuel from some where maybe filter or similar as opposed to running rich

12-11-10, 07:15 PM	#8
SkinnyMan88 Grown up member Join Date: Oct 2010 Posts: 41	Mine used to run at about the same mpg, pretty much exactly the same! And I never smelt any excessive fumes or anything but changed the lambda sensor and started getting around 35 mpg. The old one was black as anything, no wonder it wasn't working! Might be worth a look. Also, the cold start valve / fifth injector stick open aparently. You just need to warm the engine up, pop it out and plug the hole then turn the engine back on, it shouldn't release any fuel when warm. Hope that helps

12-11-10, 07:26 PM	#10
SkinnyMan88 Grown up member Join Date: Oct 2010 Posts: 41	Problem is, the injectors are pricey (around the £100 iirc ) but easy to fit. The lambda sensor is less so (I paid about £60 I think) but a ballache to fit lol. The cost is offset in what you save on fuel though, at least Good luck, hope you get it sorted.