I recently purchased a golf mk3 gti coupe which was doing fine fo

This is normally the crank angle sensor.

well on the mk3 like mine its right under next the front mount of the engine,below the distruibutor,both mk3 and 4 8v's are the same motors just a different style of intake. good luck

not sure here as to the correct layout of this engine but please forgive me as i blame my age but on the side of the butterfly on this engine ,right side from front is a box with 3 torx screws or is it four anyway this when removed has a carbon twin track check this out as often this wears out and then the engine will not idle .Use a multi meter to test the tracks for continuety ,now do you need to know about a humber hawk or MKIV zodiac as well .

Did you resolve this?
I drive a mk3 golf GTI 8V and mine starts fine but after driving for about 3 minutes (engine warms up) it starts to misfire, the car stalls and then you can't start it again until the engine has cooled. Does this sound similar?

My mk3 1996 16v 2ltr was playing up, wouldnt start when cold, wouldnt rev above 4500-5000. I changed the ignition switch, ecu relay, petrol pump relay, plugs,plug leads, coil, and finally, checked the hall sender on the dizzy, and found a broken wire in the dizzy body. Got a 2nd hand dizzy from a breakers for 40 quid, (150 or more new) and all is well. (I actually took the car to two garages and they couldnt find the problems, no faults registered on vagcom).

may have a leaky cold start valve injector

its a valve sticking or a coil breakdown

just unplug the immobiliser unit. its behind the glove compartment for rhd models.

the golf gti was plauged with a fault which vw will not own upto. it is a know fact that the induction manifold can sometimes fracture and allow unwanted air in when hot. if well serviced you will find this to be the problem. if not then i would strongly recomend that you service it.

The fitting on the fuel rail or you will have to use a adapter to the output side of the fuel filter