Hi

My son has been given a seicento sporting with a short mot to use

It has developed a fault
It will start for about 2 seconds then stop

I have bought a spares car & swapped Ecu, coil packs, plugs, leads, water temp sensor, crank sensor, top dead centre sensor, lambda sensor( lower one) inertia switch, throttle body,

the fuel pump makes a noise when the key is turned, fuel is being delivered to the fuel rail.

Key symbol goes out on the dashboard when starting.

Thanks in advance Dan

Welcome

It sounds like the only thing you've not done is check the timing?

Hi Thanks for the response

How do I check the timing, I assume it can only be adjusted via the cam belt ?

Yeah it would be, try following the guide for belt replacement - https://www.fiatforum.com/cinquecento-seicento-guides/100553-cam-belt-change.html

If history is unknown, it's probably worth getting a new timing kit, water pump and aux belt if you're gonna be in there anyway.

Timing should be ok as car was running fine prior to the current starting issue?

Danhart said:

Timing should be ok as car was running fine prior to the current starting issue?

Click to expand...

unless the belt has skipped. have you checked for any ecu fault codes?

Fault codes
No I don’t have a code reader,
Can you recommend where I could get one?

If I check for a spark & the spark stops after a couple of seconds would that symptom lead me away from the issue of timing being slightly out?

Crank sensor

D

I have used 3 different crank sensors, all with no effect.

If none of the above, I'd say a possible idle control valve fault or MAP/vacuum line to map issue.

Just bought a fault code reader from eBay, will post the results on here

Fault codes
Ignition coil primary/ secondary fault coil a
Ignition coil primary / secondary fault coil b

Swapped both coil packs & ecu

.?..?.?

Both coil packs have a fat pink wire to each and a thinner wire

Pink wire is 12v positive & is live with the fuel pump (working ok)

Thinner wire must be the signal from ecu

Traced the cables from the coils to the ecu both ok

Traced the cables from the crank sensor to the ecu all ok

Traced the cables from the cam sensor to ecu all ok


Out of ideas ??

It's interesting it's registering a fault on both coil banks, i'd say a possible earth issue.


Either that or a signal issue (i.e intermittent crank sensor issue).

Fitted new plugs,Removed complete wiring harness (injectors, crank sensor, cam sensor, water temp sensor, coils, oil temp, block temp,) from donor fiat & fitted it to the sporting with no improvement swapped cam & crank sensors from both cars, symptoms exactly the same, starts for about 2 seconds then just turns over, if left for a while it will start again for just 2 seconds :bang: