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AUDI A8 D3 4.2 V8 BFM. CAR SWITCHED OFF WHILE DRIVING .

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Old 05-24-2014, 09:45 AM   #1
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Default AUDI A8 D3 4.2 V8 BFM. CAR SWITCHED OFF WHILE DRIVING .

HI GUYS I NEED URGENT HELP .

AS I WAS DRIVING IN TIPTRONIC THE SUDDENLY CUT OUT
AND DID NOT START AGAIN .
I MANAGE TO PULL OUT THE SPARK PLUG NO:1 AND THIS IS WHAT IT LOOKS LIKE . PLEASE LET ME KNOW WHAT COULD HAVE CAUSED IT TO DO SO.
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Old 05-24-2014, 09:48 AM   #2
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Catastrophic engine failure would be my guess. How is the timing belt? Do the cams still move if you turn the crank?
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Old 05-24-2014, 09:58 AM   #3
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HI THE TIMING BELT'S GOOD AS THAT WAS THE FIRST THING I CHECKED.
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Old 05-24-2014, 10:05 AM   #4
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Default It may just be a simple - single incident - bad plug?

Quote:
Originally Posted by altaf View Post
HI THE TIMING BELT'S GOOD AS THAT WAS THE FIRST THING I CHECKED.
Just put another one to see if it happens again.

Cheers,

Louis
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Old 05-24-2014, 10:10 AM   #5
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Boat anchor from the looks. I have seen plugs like that in iron block and head engines. In an aluminum engine that is really bad news.
Pull another plug to check how it looks. Or a proctoscopy to look at the piston on #1.
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Old 05-24-2014, 10:32 AM   #6
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Default Pull other plugs and do a compression check. More info would help.

Hard to be sure so far and OP provided little contextual information. How many miles? Is coolant present or gone? Did engine overheat? When was last tune up/have plugs ever been changed in recent times? Was motor pinging, knocking or making other unusual noises?

Could be a melt down of motor either directly or due to severe overheating. Could also be neglect in maintenance that might be recoverable. I think I see a Bosch OE type part # on those plugs. If those are from some prior dealer service (over even new...), the plugs could be way past their prime. Visual on the others would help put the age of this one in context absent service info.

First things I would do are look at basic service history, pull all plugs for a visual check, and run a compression check, starting w/ the affected cylinder.
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Old 05-24-2014, 10:52 AM   #7
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THE MOTOR WAS RUNNING NORMAL AND NO FUNNY NOISES WERE HEARD. I RECENTLY BOUGHT THE CAR WITH 233 000 KM . AND WAS PLANING TO DO MAJOR SERVICE AS I ALWAYS DO TO ANY CAR I BUY.

THE CAR IS CURRENTLY AT VW/AUDI GARAGE , AND WORK WILL BE STARTED ON MONDAY. THE MECHANICS ARE ALSO CONFUSED TO WHAT CAUSED THIS PROBLEM. AS THEY DID NOT EXPERIENCE THIS BEFORE.

MORE OR LESS WHAT COULD HAVE BEEN DAMAGED IN THE ENGINE.
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Old 05-24-2014, 10:57 AM   #8
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MAYBE STOP TYPING IN ALL CAPITAL LETTERS. THAT COULD BE PART OF YOUR PROBLEM.
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Old 05-25-2014, 11:12 AM   #9
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Quote:
Originally Posted by Mister Bally View Post
MAYBE STOP TYPING IN ALL CAPITAL LETTERS. THAT COULD BE PART OF YOUR PROBLEM.
:-) funny stuff
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Old 05-26-2014, 08:26 AM   #10
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Quote:
Originally Posted by 03_AR_CO View Post
:-) funny stuff
I thought THIS was the funny stuff...

Quote:
Originally Posted by ltooz_a6_a8_q7 View Post
Just put another one to see if it happens again.

Quote:
Originally Posted by Mister Bally View Post
MAYBE STOP TYPING IN ALL CAPITAL LETTERS. THAT COULD BE PART OF YOUR PROBLEM.
If I pulled a plug and it looked like that I'd be in caps lock, too!

Good luck, altaf.

-Tom
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Old 05-27-2014, 01:07 PM   #11
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Quote:
Originally Posted by aTOMic* View Post
I thought THIS was the funny stuff...






If I pulled a plug and it looked like that I'd be in caps lock, too!

Good luck, altaf.

-Tom
Yup, nothing funny about the look of that plug, never seen anything quite like it, hopefully never will ....... hope there is a good outcome for the OP
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Old 05-27-2014, 08:44 PM   #12
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Default I saw it once...not pretty

when my dad had me pull him home the old fashioned way--with a rope. He said the 225 slant 6 in the Dodge just "gradually lost power." Motor turned but would't run. Pulled the plugs and found one melted down like that. Ran a compression check and got zero on same cylinder. Pulled head and found piston blown completely through to where I could literally see down to the rod bearing area of the crank, plus the wrist pin still hanging on to the remnants of the piston.

Yeah right, just gradually lost power dad?
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Old 05-28-2014, 05:36 PM   #13
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Default Saw an engine like that

Quote:
Originally Posted by MP4.2+6.0 View Post
when my dad had me pull him home the old fashioned way--with a rope. He said the 225 slant 6 in the Dodge just "gradually lost power." Motor turned but would't run. Pulled the plugs and found one melted down like that. Ran a compression check and got zero on same cylinder. Pulled head and found piston blown completely through to where I could literally see down to the rod bearing area of the crank, plus the wrist pin still hanging on to the remnants of the piston.

Yeah right, just gradually lost power dad?
Saw a 327 Chevy that melted the electrodes. I think the timing was advanced too far and it was detonating.
Fresh plugs got it running. Just not very well or for very long. About that time a others friends Vega GT warped the head, the block, and threw a rod. The spark plugs looked better than this one. Overheating killed it also.
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Old 05-28-2014, 07:25 PM   #14
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Well I for one hope he comes back to tell us the results.

It's like when you tape Svengoolie on your BetaMax and it cuts off before the end...
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Old 06-01-2014, 11:41 PM   #15
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Hi guys. This is what was found in clyinder #1.
Still busy with it .

Will keep you guys updated.

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Old 06-02-2014, 06:53 AM   #16
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Default Bent valves obviously; timing belt...

You said in a prior post timing belt was good. I really doubt that; also look at tensioner, water pump and other pulleys etc. If belt still doesn't show issues, then it would probably be down to a thrown rod or broken piston specific to that cylinder.

In any case, at least the head needs to be pulled and valves replaced if head itself undamaged. But more likely, a motor rebuild alongside a decent guess that more valves will be bent, and on both sides. The most cost effective could well be a used engine swap--with a full belt job going in.
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Current #2: 2013 Q5 2.0T hybrid; Scuba blue w/ chestnut sport interior; Euro delivery 7/2013 (pictured at Ingolstadt); RS5 front brakes
Prior (each modded): 2000 C5 A6 4.2 & '96 C4 A6 2.8Q, both still w/ family; '85 C3 5000S 5 sp FWD; '73 C1 100LS

helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.

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Old 06-02-2014, 02:10 PM   #17
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Ouch. Given that the plug is crushed as well as the bent valves indicates that the piston is no longer attached to the crank. Broken timing gear will bend valves but plug (snigger) should remain intact. My bet is on failed big end bolts or a snapped con-rod.

The engine must be making a terrible racket when cranking?

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Old 06-03-2014, 07:44 AM   #18
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If only that cylinder valves are bent it is not timing belt. It is most likely that something got into cylinder. Piston is broken for sure. It sounds like engine replacement.

Roma is nice.
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Old 09-21-2014, 11:54 AM   #19
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Click the image to open in full size.
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Old 09-21-2014, 11:55 AM   #20
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complete engine overall

AE pistons
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Old 09-21-2014, 11:55 AM
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