wont start Seat leon mk1 fr 2005 petrol auq engine

[missleonmrk1]

hi can anyone please help , i have a seat leon mk1 2005 petrol. car has always been fine until the other day, suddenly the car seemed like it was a about to cut out a couple of times but revived before finally cutting out and now will not start at all , turns over but will not fire!!

ive looked on these forums etc and done the recommended, change both relay 409 and 428 , checked fuel puml for power and have just under 2 volts yet primes as normal upon opening the door, which to me suggests the pump works for it to prime?

i have changed the crank shaft sensor as also discovered there is no spark but still to no avail

the car will not even let an obd reader connect to car

upon turning on ignition all is the same except an electronic stability warning light now appears ?

 

[mty12345]

hi can anyone please help , i have a seat leon mk1 2005 petrol. car has always been fine until the other day, suddenly the car seemed like it was a about to cut out a couple of times but revived before finally cutting out and now will not start at all , turns over but will not fire!!

ive looked on these forums etc and done the recommended, change both relay 409 and 428 , checked fuel puml for power and have just under 2 volts yet primes as normal upon opening the door, which to me suggests the pump works for it to prime?

i have changed the crank shaft sensor as also discovered there is no spark but still to no avail

the car will not even let an obd reader connect to car

upon turning on ignition all is the same except an electronic stability warning light now appears ?

I take it the 2 volt part was a typo and it was meant to say 12v??

If you have you no spark on any cylinder then that is the key here I think. That coupled with the fact you can't connect to the car with an OBD reader would make me think that maybe the ECU or the wiring to the ECU is bad. AFAIK the only other thing that would give no spark is the crank sensor, and as you say you've already changed that.
I think checking you have power and ground to the ECU would be the next step.

 

[missleonmrk1]

no its just under 2 volts but primes im goin to take a look at the ecu today

 

[mty12345]

no its just under 2 volts but primes im goin to take a look at the ecu today

Should be at least 10V imo. May be priming but not have enough voltage to pump. Have you measured the volatge with it disconnected too?

 

[Yellow fr]

That sounds a bit like what I had when the relay died for the fuel pump


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[missleonmrk1]

got it sorted a wire come loose on the ecu!!!
start runs and drive thank god

 

[mty12345]

got it sorted a wire come loose on the ecu!!!
start runs and drive thank god

Glad you got it sorted.

 

[missleonmrk1]

thank for the help everyone appreciate it