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  #1  
Old 14th February 2011, 07:13 AM
RanjS8 RanjS8 is offline
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Default Prefacelift A8 won't start

Hi have pf a8 4.2 for some reason this morning car wouldn't start....the engine cranks over and goes to start...but then just stops...any ideas would be appreciated....last time it was driven was Friday morning so it's only been standing a couple of days....
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Old 14th February 2011, 04:47 PM
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Conan_the_Librarian Conan_the_Librarian is offline
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If it starts for a second then stops it sound like immobilsor issues.
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2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block.
1997 4.2 A8SQ - the Projekt. 12 years and ongoing!
1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard
2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion.
2005 C5 Allroad 2.5TDi FE - Grey - Workhorse.
2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter.

Previously
2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex
1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure.
1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex.
2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on.
1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8.
And a list of non VAG going back 40 years before I saw the light.
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Old 15th February 2011, 08:29 AM
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Quote:
Originally Posted by Conan_the_Librarian View Post
If it starts for a second then stops it sound like immobilsor issues.
I can tell if mine is going to play up if i wait for the light to go out it'll start flashing, once flashing it will not start so i have to switch the ignition off and on see if the light stays out. If you can get the light to stay off it'll start.

Could be fuel maybe
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Old 15th February 2011, 01:05 PM
RanjS8 RanjS8 is offline
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Thanks for your replies guys....

Turns out the fuel pump fuse had blown....however
when I put in a new fuse that blew too....at which point I gave up and have
passed the car on to a local auto electrician....cos
I figured he would diagnose the issue much quicker than me.

Ps just at mrc today getting my s4 an oil service....mike ur rs4 looks stunning....
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Old 15th February 2011, 01:21 PM
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Quote:
Originally Posted by RanjA8 View Post
Thanks for your replies guys....

Turns out the fuel pump fuse had blown....however
when I put in a new fuse that blew too....at which point I gave up and have
passed the car on to a local auto electrician....cos
I figured he would diagnose the issue much quicker than me.

Ps just at mrc today getting my s4 an oil service....mike ur rs4 looks stunning....
That's Clive's RS 4

Let me know what power the S4 makes on the dyno
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  #6  
Old 15th February 2011, 04:05 PM
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I'm guessing the fuel pump has stalled!!! Drawing to much current trying to start and blowing fuzes.

Don't be cponned into a new fuel pump assembly you can change the pump as Amar can attest to.
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Conan (the Librarian)

Watch it if you dare

Currently,
2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block.
1997 4.2 A8SQ - the Projekt. 12 years and ongoing!
1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard
2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion.
2005 C5 Allroad 2.5TDi FE - Grey - Workhorse.
2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter.

Previously
2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex
1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure.
1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex.
2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on.
1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8.
And a list of non VAG going back 40 years before I saw the light.
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  #7  
Old 16th February 2011, 10:40 PM
RanjS8 RanjS8 is offline
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Default problem resolved

Got my a8 back today....just as you had said....the fuel pump had failed....fortunately the chap I gave the car to was really reasonable and changed it for next to nothing far as I am concerned....think he just charged me for a fuel pump.....

Curious though...why would a bad fuel pump draw so much current....I would have thought it would just stop working.....
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  #8  
Old 8th March 2011, 10:53 AM
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If the pump is stalled, ie some grit or crap stopping it turning then due to electrical mysteries it pulls more and more current to try to get it moving and therefore blows the fuse.

It's there as a safety device and it worked.

No fuse then the pump would melt out and your car would go on fire and.....
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  #9  
Old 9th March 2011, 09:23 PM
RanjS8 RanjS8 is offline
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thanks for that....sounds like bypassing the fuse and having a dodgy fuel pump is a sure way to a car bomb....thanks god for that thin piece of fuse wire.....
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