2.3 NG Starting issues - Page 4

Cynical26 · 05-01-18, 11:05 AM

The metal breather pipe (No. 2) is blanked off.

The rubber connection from the crankcase (No. 4) is open.

Both number references from the top diagram I posted.

John. · 05-01-18, 12:35 PM

The fuel filter's been changed yes?

Have you lifted up the fuel metering head(just split the airbox) to check that the flap moves freely and doesn't stick at any point?

Hanuman · 06-01-18, 10:20 AM

In the coupe, with NG engine, does the idle control valve also provide the extra air for cold start, that would previously have been the auxiliary air valve in previous less sophisticated setups?

Does the idle control valve function correctly?

Cynical26 · 03-08-20, 12:29 PM

Resurrecting this thread as although the initial starting issue disappeared (not 100% sure it wasn't related to poor fuel and the fuel filter) I'm still having issues, just bigger ones.

I ran the coupe very little the last year, 1050 miles, and prior to its MOT last summer it was starting fine but had a bit of a misfire under load still. Took it out prior to its MOT, put in 99ron fuel and gave it a real blast - all fixed

Anyway, I'm using (was) the car a lot more now and its developed the following issues:

Can take minutes to start (during which time it turns over strong but will not catch). During this time the car will very occasionally backfire and turns over roughly until eventually starting.
Will idle for 25 min or so without issue but as soon as the accelerator is pressed it will cut out.
When driving under full throttle the car will stutter and sound really rough (backing off the throttle will see it run smooth again)
But most worryingly the car will just cut out while driving. It will begin to splutter, feel under powered, then die. Stopping and turning it over again will see it restart straight away (most of the time). The problem can happen every 2-3 minutes.

Work carried out:
Fuel filter changed
Air box swapped out to a spare without all the holes

New plugs
Crank breather pipe correctly fitted (has been for a while)
Car will stutter if the oil filler cap is removed.
Rubber hoses checked for leaks (none found but not ruled out)
I can hear the fuel pump prime prior to attempting to start the car.

Any pointers appreciated. Anyone experienced issued with an under powered fuel pump etc?

BackintheFold · 03-08-20, 01:05 PM

Checked the timing?
(I've not read the past posts, nor do i know which Coupe this is.)

Cynical26 · 03-08-20, 01:39 PM

Quote:

Originally Posted by BackintheFold

Checked the timing?
(I've not read the past posts, nor do i know which Coupe this is.)

No, i haven't, Although nothing has been altered or changed that way in the 3+ years I've had it.

2.3 NG 10v

Ben · 03-08-20, 02:18 PM

It would help if you could read the fault codes as it sounds like a knock sensor/timing issue.

Cynical26 · 04-08-20, 11:31 AM

Quote:

Originally Posted by Ben

It would help if you could read the fault codes as it sounds like a knock sensor/timing issue.

Unfortunately I don't have the hardware to read codes. Also heard the 10v wipes the memory each time the ignition is switched off and a blink test is almost impossible to read?

BackintheFold · 04-08-20, 12:03 PM

I read the codes with my MB ur, but if you can't stand the idea of reading yours, time to start from scratch.
fuel / air
spark
timing
compression

then move on to a complete strip down of the wiring loom, followed by re-installing using the wiring diagram available online.

I'd try the blink codes first though.

Cynical26 · 04-08-20, 01:15 PM

Quote:

Originally Posted by BackintheFold

I read the codes with my MB ur, but if you can't stand the idea of reading yours, time to start from scratch.
fuel / air
spark
timing
compression

then move on to a complete strip down of the wiring loom, followed by re-installing using the wiring diagram available online.

I'd try the blink codes first though.

Helpful

Its not that i can't stand the idea, I just don't have the kit or experience.

06-01-18, 10:20 AM	#33
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	In the coupe, with NG engine, does the idle control valve also provide the extra air for cold start, that would previously have been the auxiliary air valve in previous less sophisticated setups? Does the idle control valve function correctly? __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

03-08-20, 12:29 PM	#34
Cynical26 Grown up member Join Date: Dec 2016 Location: North Ayrshire Posts: 735	Resurrecting this thread as although the initial starting issue disappeared (not 100% sure it wasn't related to poor fuel and the fuel filter) I'm still having issues, just bigger ones. I ran the coupe very little the last year, 1050 miles, and prior to its MOT last summer it was starting fine but had a bit of a misfire under load still. Took it out prior to its MOT, put in 99ron fuel and gave it a real blast - all fixed Anyway, I'm using (was) the car a lot more now and its developed the following issues: Can take minutes to start (during which time it turns over strong but will not catch). During this time the car will very occasionally backfire and turns over roughly until eventually starting. Will idle for 25 min or so without issue but as soon as the accelerator is pressed it will cut out. When driving under full throttle the car will stutter and sound really rough (backing off the throttle will see it run smooth again) But most worryingly the car will just cut out while driving. It will begin to splutter, feel under powered, then die. Stopping and turning it over again will see it restart straight away (most of the time). The problem can happen every 2-3 minutes. Work carried out: Fuel filter changed Air box swapped out to a spare without all the holes New plugs Crank breather pipe correctly fitted (has been for a while) Car will stutter if the oil filler cap is removed. Rubber hoses checked for leaks (none found but not ruled out) I can hear the fuel pump prime prior to attempting to start the car. Any pointers appreciated. Anyone experienced issued with an under powered fuel pump etc? Last edited by Cynical26; 03-08-20 at 04:13 PM.

03-08-20, 01:05 PM	#35
BackintheFold Senior Member Classic Audi Club Member Join Date: Feb 2019 Location: Near an MB ur Quattro Posts: 1,171	Checked the timing? (I've not read the past posts, nor do i know which Coupe this is.) __________________ 2006 A3 (daily drive) 1987 MB ur

03-08-20, 02:18 PM	#37
Ben 4 ring whore! Classic Audi Club Member Join Date: Mar 2008 Location: Stockport Posts: 2,348	It would help if you could read the fault codes as it sounds like a knock sensor/timing issue. __________________ 1992 80 quattro 20vt

04-08-20, 12:03 PM	#39
BackintheFold Senior Member Classic Audi Club Member Join Date: Feb 2019 Location: Near an MB ur Quattro Posts: 1,171	I read the codes with my MB ur, but if you can't stand the idea of reading yours, time to start from scratch. fuel / air spark timing compression then move on to a complete strip down of the wiring loom, followed by re-installing using the wiring diagram available online. I'd try the blink codes first though. __________________ 2006 A3 (daily drive) 1987 MB ur

05-01-18, 11:05 AM	#31
Cynical26 Grown up member Join Date: Dec 2016 Location: North Ayrshire Posts: 735	The metal breather pipe (No. 2) is blanked off. The rubber connection from the crankcase (No. 4) is open. Both number references from the top diagram I posted.

05-01-18, 12:35 PM	#32
John. 4 ring whore! Classic Audi Club Member Join Date: Mar 2011 Location: Scottish Borders. Posts: 7,520	The fuel filter's been changed yes? Have you lifted up the fuel metering head(just split the airbox) to check that the flap moves freely and doesn't stick at any point?