2.2 KU starting issue

simons2 · 08-05-17, 03:19 PM

FIXED

HELP

(please)
So rebuilt the head and all was well.
Started to develop a 'flat' spot in the rev's and a splutter as though a miss fire, then wont start.

Thus far.
1/ I have a spark.
2/ will run on wd40
3/fuel pump primes
4/fuel at metering head.

I thought the metering head might have been gummed up so removed piston from it (seemed ok).
Fuel squirts out at meter head to injector lines.
Put air through the injector and it worked
Removed an injector, cranked engine and raised metering head and nothing in the jam jar zero fuel (without injector fitted I get a dripple)?????
Raise the metering head 'plate' and resistance up, release and it just drops down.
So what am I doing wrong?
Still the piston in the metering head at fault?
Would the potentiometer cause a non start if faulty?
Any help ideas appreciated.

Arch_80 · 09-05-17, 09:16 AM

What about the fuel warm up regulator? I have had a lot of starting troubles with that but that is only with my KK. The KU has been fine so far. Sorry not to be of any help.

simons2 · 09-05-17, 09:20 AM

Thanks for the reply Arch-80.

I wondered that but it was a mild day yesterday so not critical IMO to it starting plus it just works on cold start so I presumed it would just run rough until warm.

Anyone had experience of the 'fuel pressure accumulator' breaking????? Running symptoms???
Starting to think this could be my issue based upon research thus far.

Arch_80 · 09-05-17, 09:33 AM

I believe it doesn't matter, fuel still passes through it and if it is blocked or full of crap. It's an easy one to look at anyway and rule out of the starting issue your having. It was just one of my issues on a different engine. Out of interest do you hear a scraping sound of metal on start ups?

simons2 · 09-05-17, 12:22 PM

No but fuel pressure accumulator was making a lot of noise.

Groundhog · 09-05-17, 03:02 PM

As a quick check remove the fuel pump relay and bridge the terminals so the pump runs continuously. Pull an injector out and place in a jar, lift the flap under the rubber dome a little and fuel should spray from the injector - lifting it further should deliver more fuel.

simons2 · 09-05-17, 04:22 PM

Groundhog- Tried that as above thanks

Arch_80 · 09-05-17, 06:26 PM

Some threads that might be of help.

http://www.classic-audi.co.uk/forum/...ad.php?t=35165

http://www.classic-audi.co.uk/forum/...ad.php?t=29491

http://www.classic-audi.co.uk/forum/...ad.php?t=22893

Sandro · 09-05-17, 09:50 PM

Check all the air and vacuum pipes over and over again. Is all connected and tight?

simons2 · 10-05-17, 07:46 AM

Arch-80....Thanks for compiling those altogether. Read the second one but not the other two.
Sandro.....Will do.
I decided to remove the fuel accumulator as the plugs are/were black and that's a sign of a knackered unit. The metal fuel lines were rusted beyond fixing so I removed them and I'm replacing with copper.
I might remove the fuel tank and 'flush out'.
I'll do all this check the above and report back.
Thanks thus far chaps for your help.

09-05-17, 09:16 AM	#2
Arch_80 Grown up member Join Date: Jan 2012 Location: Devon, not enough audi's here Posts: 35	What about the fuel warm up regulator? I have had a lot of starting troubles with that but that is only with my KK. The KU has been fine so far. Sorry not to be of any help.

09-05-17, 09:20 AM	#3
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	Thanks for the reply Arch-80. I wondered that but it was a mild day yesterday so not critical IMO to it starting plus it just works on cold start so I presumed it would just run rough until warm. Anyone had experience of the 'fuel pressure accumulator' breaking????? Running symptoms??? Starting to think this could be my issue based upon research thus far.

09-05-17, 09:33 AM	#4
Arch_80 Grown up member Join Date: Jan 2012 Location: Devon, not enough audi's here Posts: 35	I believe it doesn't matter, fuel still passes through it and if it is blocked or full of crap. It's an easy one to look at anyway and rule out of the starting issue your having. It was just one of my issues on a different engine. Out of interest do you hear a scraping sound of metal on start ups?

09-05-17, 12:22 PM	#5
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	No but fuel pressure accumulator was making a lot of noise.

09-05-17, 03:02 PM	#6
Groundhog Grown up member Join Date: Nov 2009 Posts: 143	As a quick check remove the fuel pump relay and bridge the terminals so the pump runs continuously. Pull an injector out and place in a jar, lift the flap under the rubber dome a little and fuel should spray from the injector - lifting it further should deliver more fuel.

09-05-17, 04:22 PM	#7
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	Groundhog- Tried that as above thanks

09-05-17, 06:26 PM	#8
Arch_80 Grown up member Join Date: Jan 2012 Location: Devon, not enough audi's here Posts: 35	Some threads that might be of help. http://www.classic-audi.co.uk/forum/...ad.php?t=35165 http://www.classic-audi.co.uk/forum/...ad.php?t=29491 http://www.classic-audi.co.uk/forum/...ad.php?t=22893

09-05-17, 09:50 PM	#9
Sandro Grown up member Join Date: Feb 2011 Location: Chelmsford Posts: 651	Check all the air and vacuum pipes over and over again. Is all connected and tight?

10-05-17, 07:46 AM	#10
simons2 Grown up member Classic Audi Club Member Join Date: Jun 2012 Location: ireland Posts: 291	Arch-80....Thanks for compiling those altogether. Read the second one but not the other two. Sandro.....Will do. I decided to remove the fuel accumulator as the plugs are/were black and that's a sign of a knackered unit. The metal fuel lines were rusted beyond fixing so I removed them and I'm replacing with copper. I might remove the fuel tank and 'flush out'. I'll do all this check the above and report back. Thanks thus far chaps for your help.