Cold start stepper motor - 1.6 Fiat engine

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Lurch - 28 Oct 2004 23:40 GMT

Big starting problems . . . fine when warm / hot but a pig when cold.
Fiat dealer says stepper motor gone and wants well over £200 (GBP) on
top of the diagnostic fee to replace! Car wouldn't fetch that price.

Anyone know what this bit is, where it is and where one might be found
at a reasonable price in the UK - or mail order from anywhere. Car is
a 1.6 Tempra of 1991 vintage and is fine apart from this stupidity!

Reminds me of what used to happen on cold mornings when the choke
cable had snapped. Used a piece of string or wire then, didn't have
to mess with these pathetic low quality electrical / electronic
components!

Cheers, Lurch

PS - please reply to post not mail as mail dropped ded years ago . . .

Reply to this Message

Dave Plowman (News) - 29 Oct 2004 01:14 GMT

> Big starting problems . . . fine when warm / hot but a pig when cold.
> Fiat dealer says stepper motor gone and wants well over £200 (GBP) on
> top of the diagnostic fee to replace! Car wouldn't fetch that price.

> Anyone know what this bit is, where it is and where one might be found
> at a reasonable price in the UK - or mail order from anywhere. Car is
> a 1.6 Tempra of 1991 vintage and is fine apart from this stupidity!

It's the device which alters the idle speed according to demand - assuming
an injection engine. So it will be part of the throttle assembly. First
thing I'd do is check it's not just seized.

Stepper motors as such are available from electronics suppliers - even
IIRC Maplin. But whether you could find a suitable one and replace just
that, I've no idea.

> Reminds me of what used to happen on cold mornings when the choke
> cable had snapped. Used a piece of string or wire then, didn't have
> to mess with these pathetic low quality electrical / electronic
> components!

Sadly, manual chokes got left 'on' and caused hugely increased emissions.
Hence their total disappearance years ago.

Signature

*A cubicle is just a padded cell without a door.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

Reply to this Message

Tim \(Remove NOSPAM. - 29 Oct 2004 09:17 GMT

> > Big starting problems . . . fine when warm / hot but a pig when cold.
> > Fiat dealer says stepper motor gone and wants well over ?200 (GBP) on
> > top of the diagnostic fee to replace! Car wouldn't fetch that price.

Please elabourate on the cold starting- is it more of a fast idle that is
lacking or that it just wont fire up without lots of cranking. In the latter
case, is it hesitant and reluctant once started until warm, or what?

If so, then your looking at a faulty coolant temp sensor (does a similar job
to a choke) and the ECU thinks the engine is hot all thw while, thus cold
starting mixture isnt applied.

If it fires normally, but wont keep running without accelorator assistance
until warmed- then yes, a problem with the stepper motor and or TPS.

Tim..

Reply to this Message

Lurch - 30 Oct 2004 00:34 GMT

> Please elabourate on the cold starting- is it more of a fast idle that is
> lacking or that it just wont fire up without lots of cranking. In the latter
[quoted text clipped - 8 lines]
>
> Tim..

The latter Tim - Owner says she had it diagnosed at a Fiat dealer and
they said stepper motor, when I tried it it was much the same as when
a manual choke cable snapped . . . need to hold accelerator down a
little or it dies until warm.

What's the TPS, the temperature sensor?

Ta! Lurch

Reply to this Message

S?ren C. Fischer - 30 Oct 2004 00:46 GMT

Lurch skrev:

> What's the TPS, the temperature sensor?

Throttle Position Sensor.

Signature

Regards,
Søren C. Fischer
Denmark
Fiat Brava 100 HSX

Reply to this Message