Dead Q7 3.0 tdi, 2010

[boabymeister]

Have car in title, no crank, no one from Audi to our local indi specialist have no idea why it won't crank or start, no codes everything works, pumps all electrics and clean fuel, got everyone stumped...

Regards Al

[E-bmw]

Well that should be a really simple one but you need the car in front of you, a wiring diagram and a test meter.

Job #1 first would be fully charge the battery.

Then check for voltage where it should/shouldn't be etc.

[Regbuser]

Start checking the fuses > https://fuse-box.info/audi/audi-q7-4l-2007-2015-fu...

[Jakg]

A specialist who can't figure out why a car won't crank?

You've omitted how the fault first manifested but I guess the first step is figuring out if it isn't trying to crank or if the engines seized.

[paul_c123]

Did you pay anything for them to go "huh?"

It sounds like the garage simply hasn't diagnosed the issue, did you tell them to keep looking until its diagnosed or have they charged you for an hour, looked at a number of things, eliminated them then stopped work?

[boabymeister]

Car died on motorway, started again after 30 minutes in limp mode, died after 300 yds, never started again, had vcds odis and every other diagnostic under the sun, had more investigation than MI6, not a fault code anywhere, had batterie changed, been hooked up to other cars, no odds, voltage is full battery is full electrics are fine, relays are fine, everything is fine, apart from it's a non- runner, changed crankshaft and camshaft sensors for ones we knew were working, still nothing, starter is ok too, will eventually get there, may end up fitting a temporary double pulley and turning her with the drive on one of our tractors, thanks for the interest👍

[hellorent]

So is the engine turning over and wont start ???, or as you said in your 1st post it just wont crank, the more factual you are with your explanation's more people will be able to help you.

[boabymeister]

If it ain't cranking it ain't turning over.

[E-bmw]

boabymeister said:

Car died on motorway, started again after 30 minutes in limp mode, died after 300 yds, never started again, had vcds odis and every other diagnostic under the sun, had more investigation than MI6, not a fault code anywhere, had batterie changed, been hooked up to other cars, no odds, voltage is full battery is full electrics are fine, relays are fine, everything is fine, apart from it's a non- runner, changed crankshaft and camshaft sensors for ones we knew were working, still nothing, starter is ok too, will eventually get there, may end up fitting a temporary double pulley and turning her with the drive on one of our tractors, thanks for the interest?

Well that is a bit of a different story than "won't crank".

Have you tried "jumping" the starter directly?

Have you tried hand-cranking to make sure it hasn't seized?

If it went into "limp mode" there MUST have been codes, what were they?

[boabymeister]

No codes thrown, you don't seriously think that the "experts" don't know a seized engine, if they are looking at one ?

[paul_c123]

At face value reading your posts, they're just statements. What's the question?

[E-bmw]

boabymeister said:

No codes thrown, you don't seriously think that the "experts" don't know a seized engine, if they are looking at one ?

Well, on face value from your posts I actually have precisely zero confidence in them if what you say is true.

It is NOT possible for an engine in "limp mode" to not have codes stored, otherwise why/how did the ECU decide to put the engine into "limp mode"? So if they are telling you there were none then they either don't know/didn't check/forgot to write them down or just not telling the full story.

I ask again, have YOU tried to hand-crank the engine?

Have YOU tried to "jump" the starter motor?

ETA.
Also, you say "battery is full" what are you calling "full"?

Edited by E-bmw on Monday 29th September 07:57