T5 Overfueling on tickover when really cold

[Pinchcliff]

Reference to my previous thread regarding a lumpy tickover when cold, the recent spate of cold weather has made matters worse, the displayed temprature seems to be critical, if it's 3deg or less it overfuels massivly, the exhaust emissions stink of petrol and it chucks out loads of unburned gas and really "chugs" on tickover, once moving the ecomomy gauge displays around 1.9 MPG. This lasts for around 5 mins then it's fine again. If the displayed tempreture is higher than 3deg it runs perfectly. Any ideas would be appreciated. I have no dash lights on and it's just been into the garage for a full diagnostic, other than the key reader, everything else checked out fine. Maybe worth mentioning the tempreture guage was a bit uppy / downy, I've since fitted a new (genuine) thermostat and it now sits consistently at 3 'o'clock once warm, however this has had no effect on the very cold running.

[merc85]

Have you tried a MAF?

[Pinchcliff]

Thanks for your reply, I've thought about this, does a MAF fault show up on diagnostics?

[merc85]

Doesnt always bring up the CEL light no. what year of t5 is it?

[oblark]

Have you tried unpluging the outsise temp sensor ?

It could be the idle control valve.

If the MAF is playing up wouldn`t it generate a code ?

[Pinchcliff]

It's a 99 ME7, would disconnecting the outside temp sensor help?

[Wobbly Dave]

i have a spare MAF for the t5 of that year. Overfueling is going to be most likely down to the MAF.

[Pinchcliff]

Thanks Dave, how much would you want for your MAF?

[JamesT5]

Thanks Dave, how much would you want for your MAF?

WobblyDave sorted me some Coil packs for my T5 back last year, he did me a good deal on those and saved me a lot of agro.

[Wobbly Dave]

15 plus postage - 20 quid delivered.

[JamesT5]

15 plus postage - 20 quid delivered.

That's a good deal!

[Pinchcliff]

happy to pay that

[Wobbly Dave]

Send me your details via PM & I'll make it happen.

[Pinchcliff]

PM Sent

[Pinchcliff]

Had the codes read today, all ok, however the car was warmed up and running perfectly so no real suprise. Buying Wobbly Dave's MAF so I'll pop that on and see what happens.

[Wobbly Dave]

It's in the post today. Should be there tomorrow.

[Pinchcliff]

Received today, great stuff, thanks Dave.

[theflyingbrick]

have you tried the new maf yet?? im having the same issues altough on a 850 t5 but the same even down to my temp gauge going up n down lol........i need someone else to say my maf is dead so i can tell my missus i need a 3" maf housing and sensor im yet to get a thermostat!!

[merc85]

have you tried the new maf yet?? im having the same issues altough on a 850 t5 but the same even down to my temp gauge going up n down lol........i need someone else to say my maf is dead so i can tell my missus i need a 3" maf housing and sensor im yet to get a thermostat!!

Sound like your temp sender mate, in stat housing,

[theflyingbrick]

Sound like your temp sender mate, in stat housing,

i thought that at first but it goes to half way then drops when im driving so i think thermostat is stuck open,plus the fact i already put a sensor in lol