GTI 8v AGG. Only spark once on ignition?

[bobbito]

Fitted new dizzy under RAC mans recomendation but still no start and one spark from king. Just double checked cables and the engine speed sensor behind oil filter looks shagged with bear wires and corrosion. Removed the cable and sensor but bolt sheared so quite a bit if bolt left behind. My new questions are;

1) If the engine speed sensor was knackered would it stop the car from starting

2) does the sensor undergo alot of pressure as I can't be arse to remove front of car and radiator to drill out a sheared bolt shaft.

Cheers guys.    

[FlySpeck]

1. definately, thats what the timing signal is derived from

2. the bolt needs to come out, or you wont get it fixed at all mate. the sensor is critical and probably bolted to 25nm but thats irrelevent now the head has snapped off. And easy way to remove a snapped bolt (if you have the room) is to drill a hole down the centre of it, and bang in an allen key of the same size as the drill, pick something about 1/3 of teh size of the bolt, when the allen is hammered deep into the hole, it gets a great bite, and is hard as a whores heart, it will not bend or flinch and the bolt will screw out.

[bobbito]

Legend Flyspeck. Now all I need to do is find an engine speed sensor by the weekend. GSF? Eurocar parts?Dealer??££?

[rubjonny]

yeah dizzy deffo wont cause this on an AGG. AGG/ADY/ABF engines will still run with dizzy plug completly disconnected! if it was the immob the car would fire up for a few seconds then cut out, so not that either.

so yeah, id say crank sensor, or possibly coil. the wiring to the crank sensor is all knackered so even if it was working I'd still replace it, since its only a matter of time before it fails completely.

GSF sell em for about £50, so get on the phone to your local outlet

[bobbito]

Part bought this morning from gsf for 40 odd quid on next day delivery so will be taking the front of the car off over the weekend to remove the left over sheared bolt from the block. Coil is only a year or so old and voltage from it reads ok so I live in hope.

[FlySpeck]

good one bud, gsf are the daddies lol

let us know how you get on!

[bobbito]

Yay. After removing front and fitting new crank sensor the car finally starts. Only thing now though is sorting out the dizzy as I had to remove it and now it runs quite lumpy. Do I have to plug it into a VAGCOM to sort it out.
Also the new timing belt is on but seems to wine a little almost like a super charger mine. I checked the belt tension by twisting until belt wont twist more than 90 degrees. Is this correct.

Cheers for all your help guys.

[FlySpeck]

sounds like the belt is too tight, I would say yeah 90o plus a wee bit, another 10 - 20 but it might bed in.

If the dizzy is in the correct place it would just sort itself out mate, must be a tooth out maybe?

Sounds like its a tiny bit wrong, maybe slightly retarded, is the hot tickover high? If so, it could be the other way a tooth, but usually lumpy idle is late timing if its that at all.

[rubjonny]

line the top & bottom end to tdc, then turn the dizzy till the rotor armn lines up with the notch on the dizzy housing. thats all you need to do on crank sensor equipped cars   you might find the dizzy is locked in place, if so you have to loosen the belt off and move dizzy round that way. as above, 90degree twist is right for the 8v, if its whining maybe the tensioner has had it

[bobbito]

All sorted now. Lined up intermediate pulley again and rotor. Also slackened the timing belt. Runs like a dream now. Thanks for all you help guys you've saved me a fortune. Way more useful for technical issues than ed38.