Car no worky

yeti · 11-08-12, 05:02 PM

Worked fine when I parked it up over winter (it's been a long, cold winter round mine). Went to start it the other day and it didn't work.

Here's what I've got:

1989 2.3 NG, so K-Jet injection, or some derivative thereof.
A patchy amount of K-Jet knowledge from previous 924 and XR3i ownership
Fuel pump primes.
Fuel comes out of the feed to the fuel disi if I take it off.
Therefore I surmise
a) It's not out of petrol
b) The fuel's getting this far at least
Plugs are new and sparking well, but dry

Car cranks (now it's met Mister Boost Pack)
Car momentarily fires when cold but stalls immediately
Taking the injector lines off the fuel disi the lines are all dry, except the cold start, which chucks out anice big glug when primed.

Lifted the airflow meter boot and the flap in there's moving freely.
Lifted the fuel disi and the plunger isn't seized, but there's some resistance there to it's movement.

Annoyingly, my mutimeter's at the workshop, so I can only test for power to the fuel disi with a bulb, and don't particularly want to chance this if it's gonna cause a problem elsewhere.

Any other tests you can suggest good people?

msh · 11-08-12, 05:14 PM

Air leak somewhere. Maybe fuel injection ECU not providing starting current to pressure regulator.

yeti · 11-08-12, 05:36 PM

Thanks for the quick response dude!

Found my meter! Where do I check the pressure regulator?

type81 · 11-08-12, 06:35 PM

Does it have a Warm up regulator?.....its normaly side of the engine block

alex · 11-08-12, 07:00 PM

I had this on my 1990 coupe years back it puzzled even the main dealer , I had a new ECU and it resolved it , after I left it with a main dealer for 7 weeks !

yeti · 11-08-12, 07:40 PM

Quote:

Originally Posted by type81

Does it have a Warm up regulator?.....its normaly side of the engine block

Not that I can see, guessing it'd be manifold side?

Quote:

Originally Posted by alex

I had this on my 1990 coupe years back it puzzled even the main dealer , I had a new ECU and it resolved it , after I left it with a main dealer for 7 weeks !

ECU? Didn't know it had one?

type81 · 11-08-12, 08:12 PM

sorry, ive showed you a Warm up reg of a 1781 DZ.....yours being NG will be differant/system

msh · 11-08-12, 09:40 PM

Quote:

Originally Posted by yeti

ECU? Didn't know it had one?

It has two. Since fuel pump is turned on and you've got spark, I guess ignition ECU is not of your interest. To check fuel injection ECU function, you have to measure current in series with pressure regulator with ignition turned on but engine not started, should be between 90 and 120 mA.

yeti · 16-08-12, 06:47 PM

Today I found a wiring diagram for KE-Jet

http://xkcd.com/730/

BIGGYIN · 16-08-12, 06:58 PM

Stale petrol?
Ignore that.

Just re-read
Plugs are new and sparking well, but dry

11-08-12, 05:36 PM	#3
yeti Senior Member Classic Audi Club Member Join Date: Oct 2009 Location: Derby Posts: 1,166	Thanks for the quick response dude! Found my meter! Where do I check the pressure regulator? __________________ 1990 Coupe Quattro (WTF did I buy that for?) Half a 1983 Coupe FI (long term parts shelf) 2003 Cors-arrrgh More Polos that you'd ever believe No time, no money, all the wrong tools and a workshop that's too far away

16-08-12, 06:47 PM	#9
yeti Senior Member Classic Audi Club Member Join Date: Oct 2009 Location: Derby Posts: 1,166	Today I found a wiring diagram for KE-Jet http://xkcd.com/730/ __________________ 1990 Coupe Quattro (WTF did I buy that for?) Half a 1983 Coupe FI (long term parts shelf) 2003 Cors-arrrgh More Polos that you'd ever believe No time, no money, all the wrong tools and a workshop that's too far away

16-08-12, 06:58 PM	#10
BIGGYIN 4 ring whore! Classic Audi Club Member Join Date: Mar 2009 Location: Merseyside Posts: 7,976	Stale petrol? Ignore that. Just re-read Plugs are new and sparking well, but dry __________________ q90 B2 Type 85 - q90 B2 Type 85-PROJECT-ABY 20vt KARL. Injection is nice but I'd rather be blown

11-08-12, 05:14 PM	#2
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	Air leak somewhere. Maybe fuel injection ECU not providing starting current to pressure regulator.

11-08-12, 06:35 PM	#4
type81 Senior Member Classic Audi Club Member Join Date: Nov 2009 Location: manchester Posts: 1,691	Does it have a Warm up regulator?.....its normaly side of the engine block

11-08-12, 07:00 PM	#5
alex Grown up member Join Date: Mar 2010 Location: kent Posts: 188	I had this on my 1990 coupe years back it puzzled even the main dealer , I had a new ECU and it resolved it , after I left it with a main dealer for 7 weeks !

11-08-12, 08:12 PM	#7
type81 Senior Member Classic Audi Club Member Join Date: Nov 2009 Location: manchester Posts: 1,691	sorry, ive showed you a Warm up reg of a 1781 DZ.....yours being NG will be differant/system