Evening all
Help requested prior to me forking out for a new ECU!
I have diagnosed a fault with cyclinder 1 on thew punto 1.2 16v auto ELX y reg.
I have dine this by replacing the coil pack, starting the engine, missfire is predomonaft all the way up to 200rpm then again above 2800 rpm,. but has a 800rpm free running spot. I went alloong as the engine was running and disconnected each HT cap in sequance anf found cyclinder one when disconnected made no difference to the running on the car, all the others caused the car to stall.
I checked the spark plug and swapped it with other cyclinder, & fault stayed on cylinder 1, i then swapped the injectors, and low and behold fault still on cylinder one.
I took the spark plug out of cylinder 1 put it on the HT cap and turned the engine over and a spark is present,
I then ran the engine again and discconected the injector electronic clip and the missfire was there all the way up the rev range, and the 800rpm good running between 2 & 3 krpm dissapeared.
So i have narrowed it down to the fueling, but the last resort is the ECU not telling either the spark to spark in the right place or the injector to fire at the right time, or a mixture of the two...
Anyone got any ideas? Fiat wont help me unless i book it in for diaghnostics when i have already spent far too much on the dam thing...
i guess aa compression check could be done too, but i really want to cover all basis before i book it in or buy a £330 ecu.
oh its a bosch ECu so it cant be tested or fettled.
Cheers any help advice apreciated.
Regards
Alex
Help requested prior to me forking out for a new ECU!
I have diagnosed a fault with cyclinder 1 on thew punto 1.2 16v auto ELX y reg.
I have dine this by replacing the coil pack, starting the engine, missfire is predomonaft all the way up to 200rpm then again above 2800 rpm,. but has a 800rpm free running spot. I went alloong as the engine was running and disconnected each HT cap in sequance anf found cyclinder one when disconnected made no difference to the running on the car, all the others caused the car to stall.
I checked the spark plug and swapped it with other cyclinder, & fault stayed on cylinder 1, i then swapped the injectors, and low and behold fault still on cylinder one.
I took the spark plug out of cylinder 1 put it on the HT cap and turned the engine over and a spark is present,
I then ran the engine again and discconected the injector electronic clip and the missfire was there all the way up the rev range, and the 800rpm good running between 2 & 3 krpm dissapeared.
So i have narrowed it down to the fueling, but the last resort is the ECU not telling either the spark to spark in the right place or the injector to fire at the right time, or a mixture of the two...
Anyone got any ideas? Fiat wont help me unless i book it in for diaghnostics when i have already spent far too much on the dam thing...
i guess aa compression check could be done too, but i really want to cover all basis before i book it in or buy a £330 ecu.
oh its a bosch ECu so it cant be tested or fettled.
Cheers any help advice apreciated.
Regards
Alex