long storie short.....!!

i have a 6n2 polo tdi AMF engine code.. reacently done a headgasket all working fine up untill a few days ago ( new headgasket has done over 3000miles)

it start fine in the morning performs well the lot....... it will get up to tempeture 90 and the idlin will be a bit funny.. but still drives ok!!

get home. turn the car off and it refuses to re-start!!

so it wont restart when the cars hot... I've changed the following sensors after having the machine plugged into it !

camshaft position sensor

crankshaft position sensor

coolant temp sensor!!!

ANY IDEAS?

could be a bad earth somewhere when the head gasket was done might not have been tightened properly then when it gets hot it dosent like it thats what my g40 did! i cleaned the earths put a new battery on and never had the problem again.

+1 for bad earth.

If I put x3 do I get a tenner too?

I'm not so sure on a bad earth, it would be starting bad cold aswell. does it crank but not start? or no cranking

where are the earths on a 6n2 then?? theres a gearbox one..? any ideas? i will give somone £10 this aint a joke!! lol

Edited 10 June, 201214 yr by tony100

If its not this, check your starter. My old man had a re-furbed pinto a while ago in his kit car. He was told the starter was new too, but it wasn't. Turned out the solenoid would stick when it got hot and wouldn't turn

I'm not so sure on a bad earth, it would be starting bad cold aswell. does it crank but not start? or no cranking

cranks but no start!!

I'm not so sure on a bad earth, it would be starting bad cold aswell. does it crank but not start? or no cranking

cranks but no start!!

slow crank?

Get it onto vag-com and check the output of the sensors and make sure they're working!

Just because it's new doesnt mean its working!

if it cranking slow check the earth the everything including battery

Coolant temp sensor wiring?

If its runnin and you unplug it what happens?

Faulty lambda?

I'm not so sure on a bad earth, it would be starting bad cold aswell. does it crank but not start? or no cranking

cranks but no start!!

slow crank?

cranks fine!!!

Coolant temp sensor wiring?

If its runnin and you unplug it what happens?

got ti running after a long time and unplugged it and nothing happened just stayed idiling

here we go!

Coolant temp sensor wiring?

If its runnin and you unplug it what happens?

got ti running after a long time and unplugged it and nothing happened just stayed idiling

dose it misfire at all?

here we go!

oh its a diesel

Coolant temp sensor wiring?

If its runnin and you unplug it what happens?

got ti running after a long time and unplugged it and nothing happened just stayed idiling

dose it misfire at all?

nope it dont drop revs when i unplug it just stays the same

So I'm saying start with the basics then:

Check the injectors and ensure they're spraying fuel - does the pump prime?

Get it onto vag-com and ensure you've got an RPM reading on cranking, that the temperature sensor is actually reading okay - and not -100..

I don't think bad earths would stop it firing, it's cranking too hard.

nope it dont drop revs when i unplug it just stays the same

soz put it under wronge bit lol so it dosnt misfire at all when driving it?

plug it in to vag com that will tell u I'm sure

So I'm saying start with the basics then:

Check the injectors and ensure they're spraying fuel - does the pump prime?

Get it onto vag-com and ensure you've got an RPM reading on cranking, that the temperature sensor is actually reading okay - and not -100..

I don't think bad earths would stop it firing, it's cranking too hard.

bit diffuclt to check injectors...... they are IN the head cant really check them.

dont know anyone by me who has vagcom :( didnt think it was an eart either

soz put it under wronge bit lol so it dosnt misfire at all when driving it?

nope all seems fine...... the idle used to drop and cut out but it dont now!!

Along the lines of some sort of sensor .. I thought lambda but then read it was diesel :/