Help! S4 died 150 miles from home.

[Easternlight]

Just started. Journey home from visiting friends in Mansfield, on journey back to Suffolk, Audi S4 b8 has just cut out going along straight flat @ 50, no warning , no lights on dash, now spins over but won't fire. Had a look under bonnet and can't see anything out of place , I'm fairly hands on with a few basic tools. Any body got any ideas what I can hit or fiddle with? Half tank of fuel and turns over well. HELP!!

[GC8]

Someone is going to ask you why you don't have breakdown cover.

[nottyash]

Isn't there a fault with timing chains on them? That would cause them symptoms

[NuisanceFactor]

Recently had same symptoms (different car) and it was the fuel pump fuse.

[Easternlight]

GC8 said:

Someone is going to ask you why you don't have breakdown cover.

AA are coming but just feel like I should be doing some thing.

[Pesty]

Has the battery failed?

[stropley]

NuisanceFactor said:

Recently had same symptoms (different car) and it was the fuel pump fuse.

Yeah this or something else electrical like cam/crank position sensor. It should log a code that the AA man can read then you'll know ... but doubt they'll carry the part so looks like you'll be towed or carried home.

Too much electrickery on modern cars

[Easternlight]

Two weeks out of warranty and Audi breakdown cover FFS!! It's going to be a long day!

[GC8]

Easternlight said:

GC8 said:

Someone is going to ask you why you don't have breakdown cover.

AA are coming but just feel like I should be doing some thing.

If it was an early eighties AUDI 80 then you probably should be, but a car as complicated and squashed-in as yours isn't likely to have an easy fix, particularly if you don't have any tools or a multimeter.

[lexusboy]

Run out of fuel?

[conkerman]

Crank sensor and no error message I'd guess.

[Thankyou4calling]

Did the AA get you on your way?

[Boobonman]

Get out and lock it. When you unlock it and put the key in can you hear any faint whirring noises from the fuel pump priming?

[GC8]

Should that happen if the engine isn't turning?

[Rich_W]

I shall go with fuel pump. High pressure one's but could be the one in the tank.

[Boobonman]

GC8 said:

Should that happen if the engine isn't turning?

Yes. The pump is primed before you turn the engine over.

[g3rrd]

Easternlight said:

Half tank of fuel and turns over well. HELP!!

lexusboy said:

Run out of fuel?

[GC8]

Boobonman said:

GC8 said:

Should that happen if the engine isn't turning?

Yes. The pump is primed before you turn the engine over.

I see. I suppose that this is because newer cars utilise a crash switch to turn everything off in the even of an accident?

My own Bosch ECU/DMEd car only energises the fuel pump when the engine is spinning quickly enough.

[SonicShadow]

g3rrd said:

Easternlight said:

Half tank of fuel and turns over well. HELP!!

lexusboy said:

Run out of fuel?

Has the OP actually checked there's fuel in it? Otherwise we're just assuming the fuel gauge was functioning correctly. When a car cuts out for seemingly no reason that's a pretty silly assumption to make.

[GC8]

Cars that run out of petrol seldom simply stop.