16v keeps cutting out

[Shorty]

Help required with this one please ! 1996 golf 16v gti runs for 20/25 mins then cuts out. If i try to start it right away it will fire then cut cut out again. Leave it a few mins and it will run again for a few mins then cut out again. It's had a new distributor and crank sensor fitted and all sensors have checked out ok (1 temp sensor replaced). I have a diagnostic tool which is showing up fault codes
00513-G28 engine speed sensor
00740-G145 cyl 1 recognition sensor
00525-G39 oxygen sensor
00523-G42 intake ait temp sensor
I cleared all fault codes and the only ones coming up now are the first two above. The first one 00513-g28 will i think show a fault if the car is NOT running so i think i can ignore that one but unsure about the second fault, is this the hall sensor ?
Any help or pointers towards fixing this fault once and for all would be greatly appreciated.
Oh, ALL the relays have been changed as well but still it cuts out.

[mk2_abf]

check your wiring at the back of the inlet manifold it runs along the back of the rocker mine all fused together from the heat of the engine it took me ages to find out why it kept cutting out

[danny_p]

enigne speed sensor is critacal on digifant 3.  ecu needs it to work out the cranck angel and speed, without it it can't work out when to send sparks

[rubjonny]

abf will run with the hall sensor on dizzy completly disconnected, so it wont be that.  check the fault codes on the immobilisor unit as well, could be thats failing

[danny_p]

it'll run without the lambda,    it just hunts.       it'll go without the air temp sensor as well tho it runs a bit crap

[rubjonny]

my mates abf ran pretty much the same without a lambda, as he had to drive it for a bit before he could get it booked in to have a lambda fitting welded in.  another mate had his air temp sensor plugged into the breather heater plug, seemed to run ok but a bit off.  Same guy who had his dizzy disconnected without realising, so cant say which made it run worse worse

abf pretty hardy injection system, but they dont like the vac pipe beign disconnected or a faulty crank sensor.  Worth checking the coil as well

[Shorty]

Thanks for the replies guys, will keep you informed of any progress/updates

[danny_p]

the dizzy on the 16v dosent really do a lot,  it allows the ecu to do sequential injection,   so it's firing 1 injector at a time and squirting fuel at ports with open valves.  only problem with that is   after about 20%  output is acheved  the injector needs more time to get the fuel in than the valve is open for.   it's more of an idel low throttel economy thing  but it dosent really make that much differance.   if it looses the dizzy signal it'll just jump to alternating or batch injection 

[Shorty]

Hi Guys, checked out most things today including ALL the above suggestions but still no joy  Any other pointers or suggestions before i burn it !!!

[danny_p]

check the condition of the brown wires in the loom that goes round the engine