Losing the plot - anyone who can suggest a fix for this is my hero

[olethalb]

Ok to summarise, g40 in mk1 golf been in the workshop running fine for 2 months in and out, idle perfect never missed a beat

2 days ago ran out of fuel and this is where it all went wrong

Car starts, drives perfectly but will not idle

Parts changed

Blue temp
Co
Ecu
Fpr
Dizzy
Cap and arm
Leads
Plugs
Injectors
3 x idle control valves

Cleaned out fuel rail
Tb
Fitted new fuel filter
Dropped pumps and cleaned out
Dropped some 'petrol magic' in the tank
Checked micro switches on tb with multi meter

Lambda is new bosch and makes no difference if unplugged

All parts removed from mk1 have also been fitted onto running polo g40 and that runs fine with all parts swapped out 

Tb gaskets are good

Makes no difference really if blue temp sensor is unplugged

Occasionally runs better with tb unplugged

I'm at the end with this

Any help greatly appreciated

[C0UP3]

If you lambda isn't making any difference then check the earthing on it plus check the loom for any breaks. Unplugging a lambda should put ecu in safe mode and make the car run a cold start fuel and spark map. Runs richer and will idle higher.

Does it make any difference between hot or cold running?

[olethalb]

Earthing point is good and new as is loom

98% of the time sputters and cuts out, the 2% it idles at 2000rpm for around a minute then cuts out

Only from stone cold does it idle ok til auto choke comes of

[olethalb]

Nothing changes if you unplug anything really, only tb sometimes

[Etches]

Sounds like blue temp wiring has an open circuit, have you checked all the plugs n loom over?

[PeteG40]

Check alternator and battery as the sensors get the hump without proper voltage

[olethalb]

Checked idle circuit and blue temp circuit

Battery is new and strong and alternator kicking out decent volts

Surely symptoms of a dying fuel pump would be more apparent at wot?

[Alexiskayak_7]

What happens at wot conditions. Everything is ok, or you feel a hesitation?

[PeteG40]

What's ' decent volts' ?

And what's the co pot set to?

How old is the coil?

[olethalb]

Wot is strong all the way to limiter

Coil was new but tried 2 others

Battery seeing 13.5 when running

[olethalb]

Co set to 550 and tried 2 others too

[Ben.lopo]

How about the knock sensor?

[Alexiskayak_7]

1)Have you checked all the vaccum lines and generally all the hoses that are around the inlet manifold
2)Also check the condition o the inlet mani and throttle body gasket by pooring water while it is working.
3)Have you checked the fuel pressure and supply?

Otherwise, check with a multymeter all the terminals of the loom. It is really weird the fact that doesn't change anything while you unplug blue temp sensor and lamda sensor.

[olethalb]

Wasn't aware knock sensor would affect idle

I appreciate the suggestions given so far but must say this only happened when it ran out of fuel

There are only 2 vac lines and no servo on this car, all pipes are new and checked

Had the tb off and cleaned it and checked gasket, usually sucking excess air will always cause high idle

Checking fuel pressure tomorrow

Have run continuenvpcy tests on the loom

I'm starting to struggle to belive anything would have failed at the exact moment it ran out of fuel.....

[Ben.lopo]

How old is the tank sometimes with clleaning it out brings up shit in the pipes even tho you've cleaned them out this May have blocked an injector still , but still I'd check knock sensor and lambda