Excessive fuelling on 2.0 8V coupe - Page 2

Timo · 12-11-10, 07:37 PM

Cheers fella, will report back if not.

Rapidresto · 10-12-10, 11:13 PM

think i've got a 5th injector kicking around in my parts stash somewhere fella.

Timo · 16-12-10, 06:30 PM

Hmm, cool. Rob took a look at it a few weeks ago and he reckoned the 5th injector setup was working fine but when put on the analyzer it was off the scale rich so pointing at faulty lambda maybe?

Rapidresto · 16-12-10, 10:20 PM

cool, tis most likely to be lamda related or even the coolant temp sender failing and telling the engine to run rich (had that one on my 8v mk3 gti).

Booty · 16-12-10, 10:52 PM

Or the thermostat. Is temp guage working ok?

Snoopafella · 17-12-10, 04:16 PM

Could maybe try unplugging the connector for the fifth injector/ cold start valve, therefore rending it inoperable and see if that improves things. If nothing changes you can just plug it back on.

EDIT - Just read elsewhere someones already suggested a similar thing.

Dez · 24-12-10, 11:33 PM

Any updates on this.

Just do a full service, plugs, air filter, rotor arm, and o2 sensor. Maybe ecu side temp sender.? about £4..
Cures allsorts of problems.

You cant even start to guess problems without doing the basics.

Timo · 14-04-11, 08:43 PM

Hmm, OK well I've now swapped the lambda sensor over from my old car and things seem a little better, still not sure if its fully sorted but difficult to tell as I'm doing a lot of short journeys at the mo but looking more like 30mpg now rather than the low 20s it was. Lambda was my initial guess as the outer cable on the old one looked a little chewed up like it had been snagged up in something at some point. Inner cable looked fine but you never know if its broken down the copper cable inside I guess. Will get it on the analyzer again when I get chance and check the mixture levels.

Cheers for all the suggestions people.

David Small · 14-04-11, 08:52 PM

Quote:

Originally Posted by Coxy

Drop the 16v in!

Spot on Sir !

having had the B4 Sport for a couple of months now I have come to the following conclusion

Commuting - 16V beats the pants off the 8V

On a long run the 8V wins but mine does have an extra high 5th gear

Timo · 14-04-11, 09:00 PM

Don't tempt me

I keep having to talk myself out of this as it is. Time is the main problem, oh and getting the engine crane back off Krez!

12-11-10, 07:37 PM	#11
Timo Grown up member Classic Audi Club Member Join Date: Jul 2007 Location: Shropshire Posts: 352	Cheers fella, will report back if not. __________________ 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

16-12-10, 06:30 PM	#13
Timo Grown up member Classic Audi Club Member Join Date: Jul 2007 Location: Shropshire Posts: 352	Hmm, cool. Rob took a look at it a few weeks ago and he reckoned the 5th injector setup was working fine but when put on the analyzer it was off the scale rich so pointing at faulty lambda maybe? __________________ 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

16-12-10, 10:52 PM	#15
Booty Moderator Classic Audi Club Member Join Date: Sep 2007 Location: Deepest darkest Shropshire Posts: 5,077	Or the thermostat. Is temp guage working ok? __________________ 1987 Audi Coupe quattro - Clarion Tribute Car 2012 Audi A6 Allroad 2004 Mercedes SLK 350 2017 Mercedes GLA 220

14-04-11, 08:43 PM	#18
Timo Grown up member Classic Audi Club Member Join Date: Jul 2007 Location: Shropshire Posts: 352	Hmm, OK well I've now swapped the lambda sensor over from my old car and things seem a little better, still not sure if its fully sorted but difficult to tell as I'm doing a lot of short journeys at the mo but looking more like 30mpg now rather than the low 20s it was. Lambda was my initial guess as the outer cable on the old one looked a little chewed up like it had been snagged up in something at some point. Inner cable looked fine but you never know if its broken down the copper cable inside I guess. Will get it on the analyzer again when I get chance and check the mixture levels. Cheers for all the suggestions people. __________________ 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

14-04-11, 09:00 PM	#20
Timo Grown up member Classic Audi Club Member Join Date: Jul 2007 Location: Shropshire Posts: 352	Don't tempt me I keep having to talk myself out of this as it is. Time is the main problem, oh and getting the engine crane back off Krez! __________________ 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

10-12-10, 11:13 PM	#12
Rapidresto Grown up member Join Date: Jul 2007 Location: Telford Posts: 135	think i've got a 5th injector kicking around in my parts stash somewhere fella.

16-12-10, 10:20 PM	#14
Rapidresto Grown up member Join Date: Jul 2007 Location: Telford Posts: 135	cool, tis most likely to be lamda related or even the coolant temp sender failing and telling the engine to run rich (had that one on my 8v mk3 gti).

17-12-10, 04:16 PM	#16
Snoopafella Grown up member Join Date: Aug 2008 Location: Bournemouth Posts: 144	Could maybe try unplugging the connector for the fifth injector/ cold start valve, therefore rending it inoperable and see if that improves things. If nothing changes you can just plug it back on. EDIT - Just read elsewhere someones already suggested a similar thing.

24-12-10, 11:33 PM	#17
Dez Grown up member Join Date: Apr 2010 Posts: 39	Any updates on this. Just do a full service, plugs, air filter, rotor arm, and o2 sensor. Maybe ecu side temp sender.? about £4.. Cures allsorts of problems. You cant even start to guess problems without doing the basics.