my 900cc seicento, X reg (not sure if mpi or spi) struggles to start once warm, once ive been driving after at least 15 mins if i stop and start again.

engine starts first flick of key when cold.

what could this be?
i have to try different amounts of throttle to start the car (usually somewhere around 1/4)

any help appreciated
dom

All 899 are spi. Likely to be the engine temp sensor -- blue coded.

Check the sender output when warm against the nominals. Think it might be giving the wrong reading so the car thinks its colder than it is....assuming coolant level and quality are correct.

Cheers

D

you need to borrow a multi meter set it to ohms.

when the auto is warm locate the blue coolant temperature sensor, remove the cable connected to it, think it needs a squeeze, and connect the probes of the multi meter to each pin

the resistance should be in range 50-500 ohms (from memory) if it is larger you need to fit a replacement sensor and replace the coolant that escapes.

you have got blue or orange stuff in the header tank?

I have this same problem its the sensor resseting itself

Sensor won't/can't reset itself. Its a dumb sensor that turns temperature into a variable resistance for the map to read. Wrong value sent to ECU = poor running/starting.

Cheers

D

confirmed it is merely a temperature sensitive resistor in a brass case

i will check my coolant etc tommorow after work. so if all is ok in term of coolant then its almost definately the coolant temp sensor?

Aye.