Engine doesn't fire when warm...

Daveymaclad · 16-09-10, 11:00 PM

I have an unusual problem with my mb quattro.

When firing the car up from cold the alternator turns over a few times then the engine slowly but surely burbles into life. From first start I can happily turn the engine on again for the first 5-10 minutes from cold start no problems.

The problems occur when the cars been running for more than 10 minutes. Once I turn off the car and leave it more than a couple of minutes the car simply won't start back up again. The starter motor is turning but the engine just won't catch/ignite. In this state I can fairly easily bump start it so I'm really confuzzled as to what could possibly be the matter.

As it is it makes fuel stops an absolutely critical event regards timing, either I fill her up within a few minutes of firing from cold or be prepared to bump her off the forecourt!!

Thoughts/suggestions anyone?

missfire · 16-09-10, 11:39 PM

do you hold the accelerator pedal half way down on hot starts.? that helps (only on hot starts)

Daveymaclad · 17-09-10, 07:27 AM

Tried no pedal down, pedal half down and pedal full down, all to no avail

Getting quite frustrated with it now as I love driving the car but know that I can only drive it in a circle straight back home where I can park it up before it refuses to start again!

Hanuman · 17-09-10, 07:47 AM

It may be just the very late night, and being up much earlier than I'd like...
But something doesn't quite read right.

Are you saying alternator when you mean starter motor?

Daveymaclad · 17-09-10, 07:51 AM

You're bang on, it was late, I did mean starter motor - now changed!! Something to do with getting married today is occupying my time away from the Audi :P

Coxy · 17-09-10, 08:12 AM

Quote:

Originally Posted by Daveymaclad

You're bang on, it was late, I did mean starter motor - now changed!! Something to do with getting married today is occupying my time away from the Audi :P

good luck for today!

Shouldn't really be on here then should ya!?!??!?!

Phil Payne · 17-09-10, 08:14 AM

Quote:

Originally Posted by Daveymaclad

I have an unusual problem with my mb quattro.

http://www.isham-research.co.uk/quat.../mac12pin.html

Daveymaclad · 17-09-10, 09:47 AM

Quote:

Originally Posted by Coxy

good luck for today!

Shouldn't really be on here then should ya!?!??!?!

Forgot to mention the Quattro features quite heavily in the wedding, being the vehicle taking me to and us from the venue!!!!

missfire · 17-09-10, 10:02 AM

Quote:

Originally Posted by Daveymaclad

Forgot to mention the Quattro features quite heavily in the wedding, being the vehicle taking me to and us from the venue!!!!

emergency on planet audi.......!!!!!!!!!

if it bump starts readily then it can only be starter, battery of terminals surely....?!?!?!

give the terminals a clean..? check voltage of battery if you can..?? starter engaging flywheel properly..??

i know there is a mb thing where if the ecu does not like the look of something then it will refuse to start the engine......but if it is bump starting then the ecu must be happy..(?)

JimC · 17-09-10, 10:12 AM

Quote:

Originally Posted by Daveymaclad

... getting married today is occupying my time away from the Audi :P

I hope all goes well for the wedding. CONGRATULATIONS. After 21 years of marriage, I can still recommend it.

17-09-10, 07:27 AM	#3
Daveymaclad 4 ring whore! Classic Audi Club Member Join Date: Feb 2009 Location: Bursledon - Southampton Posts: 2,575	Tried no pedal down, pedal half down and pedal full down, all to no avail Getting quite frustrated with it now as I love driving the car but know that I can only drive it in a circle straight back home where I can park it up before it refuses to start again! __________________ 2008 RS6 avant SOLD 1988 UR Quattro

17-09-10, 07:47 AM	#4
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,023	It may be just the very late night, and being up much earlier than I'd like... But something doesn't quite read right. Are you saying alternator when you mean starter motor? __________________ 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

17-09-10, 07:51 AM	#5
Daveymaclad 4 ring whore! Classic Audi Club Member Join Date: Feb 2009 Location: Bursledon - Southampton Posts: 2,575	You're bang on, it was late, I did mean starter motor - now changed!! Something to do with getting married today is occupying my time away from the Audi :P __________________ 2008 RS6 avant SOLD 1988 UR Quattro

16-09-10, 11:39 PM	#2
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	do you hold the accelerator pedal half way down on hot starts.? that helps (only on hot starts)