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[JamesV6CDX]

hi
from my own experience on a different car i would reckon its your ht leads not connected to the right plugs
this would cause a misfire and also make the exhaust hot to a point where it is glowing

Either that, or, a straightforward misfire causing the same effect, by say, a failed coil pack?

[belldarr]

James - I had a very similiar experience in a V8 BMW 7 series after having the gearbox serviced, lumpy idle that gradually got worse as I drove her, massive fuel consumption, almost managed to get the 10 miles home when the motorist behind me starting flashing his headlights and when i pulled over and had a look at the back of the car the 2 tailpipes were glowing red hot!!!  they were so hot that the bumper ignited and luckily I had an extuinguisher, anyway cut a long story short I had an engineer look at the car and he found that the garage had dropped the exhuast to access the gearbox and when re-fitting they had mixed up the lamda sensor plugs and the ECU was detecting a problem on the mixture and sending loads of fuel into a red hot exhuast - I would check those mate as it all sounds horribly familiar 

Regards

Darren

[henryd]

Had a similar problem with an 04 bmw 525i,bad misfire and neat fuel out of the exhaust,single figure fuel consumption and it turned out to be a stuck injector that would not stop fuelling.
luckily for the owner he stopped the car and it would not restart as it was trying to hydraulic with all the fuel in the cylinder,to my surprise one new injector cured it

[JamesV6CDX]

Now you mention plug lead order - he did say the cam cover gaskets had been done recently.

I just wonder, if it's been like it ever since, due to no 4 and 6 leads being crossed by a silly mechanic.... and is why he got rid 

[JamesV6CDX]

All 6 spark plugs very black

Leads and DIS visually look OK. A tiny amount of water ingress in no6.

Valve timing checked - spot on. whoever last did it, knows how it's done.

No antifreeze mix, has been running neat water for some time.

Breathers quite blocked and TBs need a good clean.

[tidla]

fuel rail pressure to high? release valve/pipe troubles? :-?

[JamesV6CDX]

fuel rail pressure to high? release valve/pipe troubles? :-?

I don't know. The rear of the car smells of petrol. I am quite thrown by ALL plugs being black. I was expecting just a couple..

What does this indicate - more fuel going in, than the plugs can cope with?

[Mr Skrunts]

fuel rail pressure to high? release valve/pipe troubles? :-?

I don't know. The rear of the car smells of petrol. I am quite thrown by ALL plugs being black. I was expecting just a couple..

What does this indicate - more fuel going in, than the plugs can cope with?

Do you mean unburnt fuel from the end of the exhaust, or a smell of fuel arround the tank.

[JamesV6CDX]

fuel rail pressure to high? release valve/pipe troubles? :-?

I don't know. The rear of the car smells of petrol. I am quite thrown by ALL plugs being black. I was expecting just a couple..

What does this indicate - more fuel going in, than the plugs can cope with?

Do you mean unburnt fuel from the end of the exhaust, or a smell of fuel arround the tank.

Both

There is some evidence of fuel running down the back of the tank.

The rear window, is also covered in petrol mist.

This, with the amount of vapour coming from the fuel filler when I removed it after a drive... indicates the pressure in the fuel tank, is WAY too high, and maybe it's vented, somewhere!

I'm confused as to what could cause that much pressure in the fuel system though

[tidla]

light brown plugs=ok
very white plugs=weak mixture
black plugs=unburnt fuel

if one plug was black then as the bmw owner said, one injector.( ht side assumed ok)

all plugs, all cylinders getting to much fuel.

fuel rail pressure has to adjust to match plenium chamber pressure. (full throttle/idle)

[tidla]

fuel rail pressure to high? release valve/pipe troubles? :-?

I don't know. The rear of the car smells of petrol. I am quite thrown by ALL plugs being black. I was expecting just a couple..

What does this indicate - more fuel going in, than the plugs can cope with?

Do you mean unburnt fuel from the end of the exhaust, or a smell of fuel arround the tank.

Both

There is some evidence of fuel running down the back of the tank.

The rear window, is also covered in petrol mist.

This, with the amount of vapour coming from the fuel filler when I removed it after a drive... indicates the pressure in the fuel tank, is WAY too high, and maybe it's vented, somewhere!

I'm confused as to what could cause that much pressure in the fuel system though

the tank is obviously not being vented as you say and it should be, fuel returning to the tank has nowhere to go (pressure build up) how does it run with the fuel cap off?

[JamesV6CDX]

Not tried with cap off, yet.

What could cause it though? something blocked? If so, what?

Or, what about the FPR? Could that do it?

[Mr Skrunts]

Has it had a new tank fitted, are the returns and vent pipes blocked or incorectly fitted.

[JamesV6CDX]

Has it had a new tank fitted, are the returns and vent pipes blocked or incorectly fitted.

Not that I know of.... doesn't look new.   :-/

[Mr Skrunts]

Has it had a new tank fitted, are the returns and vent pipes blocked or incorectly fitted.

Not that I know of.... doesn't look new.   :-/

Be tempted to at least check the whole return system, sounds like you are driving an armed bomb arround. :-/