325 runs rough when cold

Tue May 10, 2005 3:06 pm

As above, nice and smooth when warmed up but rough and hesitant to rev when cold. Sometimes get a whiff of petrol too. I've noticed from other posts here that it could be the cold start sensor? Are these cheap and easy to replace?

I plan to start with the easiest/cheapest first (i.e. plugs) and work from there. Seems to be quite common. What have others done to cure this?

Cheers

Rich

Tue May 10, 2005 3:09 pm

nothing..

ive slowly got used to mine after i gave up trying to find out what was wrong with it! i would love to know what it is though!

Tue May 10, 2005 3:28 pm

Does the car smoke a little when started! if it does that could be the beginning of worn bores, which will always cause rough starting.

If you haven't serviced the car, that would be the thing to do first,

if you smell petrol in starting, check the fuel rail supply pipe it cracks sometimes and it may cause problems.

Tue May 10, 2005 9:59 pm

Rich_F wrote:As above, nice and smooth when warmed up but rough and hesitant to rev when cold. Sometimes get a whiff of petrol too. I've noticed from other posts here that it could be the cold start sensor? Are these cheap and easy to replace?

I plan to start with the easiest/cheapest first (i.e. plugs) and work from there. Seems to be quite common. What have others done to cure this?

Cheers

Rich

sure is.
look for the blue sensor on the thermostat housing which is where all the large waterpipes meet. they cost about a 10er from gsf

regards

elliot

Wed May 11, 2005 12:56 am

go to the dealers for this part it is 4 quid dearer but i beleive it better because gsf lasted 1 year orignal 13 years
see the comparison

Wed May 11, 2005 3:39 am

Did you notice an improvement when you replaced the sensor, Fowler? I'll get one ordered from the dealers anyway and go from there. Thanks for the advice

Wed May 11, 2005 7:30 am

Hello again.

Can someone please confirm that the sensor I (possibly) need is part number 13 62 1 709 966.

Wed May 11, 2005 8:34 am

I replaced both my sensors (one for the temp guage and one for the ECU) and it made no difference what-so-ever...

Mine is still lumpy when cold, but is great once up and running.

Wed May 11, 2005 10:43 pm

Seems like there's a good few of us with these running problems at the moment - myself included.

Thu May 12, 2005 9:17 am

have you removed the blue sensor lead with the engine running, if the engine note changes and runs differently then the wiring is ok, if there is no change then you'll need to start rummaging for a broken connection.

This happened to my SE and took about an hour to sort, the difference is massive.

I did it the hard way and changed the whole injector loom as someone had cut the wires and bodged it with bullet connectors. I spliced a new (ish) plug in and a decent injector electrics rail in. Job done.