GTI 16v cutting out intermittently...

[bunter]

ok ive had my GTI 16v a few weeks now and was told of a running fault when i bought it from the previous owner. ive had no problems with it until the last few days when 3 times now the engine has cut out when decelerating for a junction. when the engine dies the revs hit zero and the car will not restart for 10-15 mins. the other odd thing i have noticed is that the temp guage never gets above half way even when we went to london the other week and was sat in traffice for an hour.

could this be temp related? possibly the thermostat?

sorry for being a pain but most of my knowledge is with mk2`s!

thanks. chris

[Lewism3]

Much the same happened with my wifes 8v GTI. Turned out to be the ECU relay which a replacement from VW cost about £10. Some poeple also say that fuel pump relays are prone to failure.

ECU relay number 30 and fuel pump relay number 67 (er.. I think)!

[bunter]

Much the same happened with my wifes 8v GTI. Turned out to be the ECU relay which a replacement from VW cost about £10. Some poeple also say that fuel pump relays are prone to failure.

ECU relay number 30 and fuel pump relay number 67 (er.. I think)!

funnily enough i did think of the fuel pump after probs on one of my old mk2`s but when i switch the ignition on i can hear the pump fire up which is good. il give the ecu relay a go, cant go wrong at a tenner! thank you for the info

[DazVR6]

Yeh Bunter do the relays thing but also clean the throttle body, this helped when this used to happen to mine, but later found out i had a corroded engine speed sensor which eventually needed replacing.

[bunter]

nice one, will give that a go too, cant hurt! thanks for the reply

[tallpaulr]

I don't think the temp gauge is part of this problem, coz my temp gauge goes straight up to 90 within minutes of starting the car and (touch wood) I not had any running problems. But like you say it doesn't move at all stood in traffic or driving round but the fans still kick in so I wouldn't be that worried about that

[Pete Taylor]

definately relays. I'd take the throttle body off and clean it anyway because the PCVs always seem to die and oil gets through the breather hosesand into the throttle body then inlet manifold then onto the inlet valves in the head

[Bobby_t_16v]

I would check all the vac hoses.  I had this problem and it was the case of a split vac hose

[bunter]

so far ive replaced the fuel pump relay with a brand new one which hasnt cured the problem. have just taken out the ecu relay (30) and opened it up to find some dodgy soldering on the board so will sort that in the morning and give it a try.

if that doesnt cure the problem il be cleaning the throttle body i think, then the crank sensor!

pain in the arse at the moment, im getting really embarrassed pulling up to a junction only for the car to die! then i just have to the hazards on and look like a total twit

[DazVR6]

Im sure if there is a fault with the crank senser it would throw up a code....have you had it on VAGcom?