I read a while ago that on ownwer had a problem with his maf and bought a sensor only to fit the original housing..his sensor number was F00C2G2044 and he bought a new sensor on ebay which had a part number reading F00C2G2030 and it worked perfectly..fiat /alfa share a great deal of parts so that doesnt surprise be one bit..his JTD is an 03 reg plate..I had to change a air temp sensor on my sons car last Aug and found that that part from mitsubishi also fitted 30 mercs.. so parts sharing on all cars is quite common ..might be worth it if you had a hunt around to see what other cars this maf of yours also fits..could save you considerable cost if you can just replace he sensor and not the whole maf..I have a link for cross referencing sensors I will look it up and give it to you so you can find out..

http://partfinder.smpeurope.com/inde...08&value=19602

Originally Posted by Xen

Thanks for that PNL! Well, I just replaced the sensor with a new one that was designed for the Stilo JTD and it gives pretty much exactly the same readings. So it seems the original sensor was OK and infact my ECU is one of those affected by the software bug.

Now I'm really struggling for ideas!

I think I would now check with fiat to see if they did any software upgrades on the JTD just as they did with the early 1.6 ones..

Originally Posted by Xen

OK, I tried that with no luck. But now I have a new theory... I suspect my fuel heater isn't working. Even when I trigger the heater manually through FES, the fuel temp sensor returns the same (ambient) temperature. What temperature should I be getting? Should the heater be coming on if the temp sensor is only reading 9.8c fuel temp?

Havnt got any info on that so can help you with it..any JTD owners got this ?

Originally Posted by Xen

OK, I tried that with no luck. But now I have a new theory... I suspect my fuel heater isn't working. Even when I trigger the heater manually through FES, the fuel temp sensor returns the same (ambient) temperature. What temperature should I be getting? Should the heater be coming on if the temp sensor is only reading 9.8c fuel temp?

Cold engine, ignition on, engine not running.
Just tried triggering the fuel heater relay a couple of times using FiatECUScan. I monitored the fuel temp, it took 75 seconds to raise the temperature 2 degrees from 9.6 to 11.6 degrees. It climbs slowly at first so give it 20-30 seconds before taking a temp reading.

Originally Posted by Xen

Will do :) I'm also going to run the tank pretty much dry of the tesco diesel in there and try some BP Ultimate as suggested.

I know it costs more than normal diesel but use it for as long as your pocket will allow, it works wonders on some cars. A friend was having power and MPG problems that increased over time. Fiat could find nothing wrong. He was advised by a diesel Audi A3 driver to fill his tank with BP Ultimate Diesel and thrash it for a few miles. Junction 10 to Junction 14 and back on the M6 at 2am foot planted firmly on the floorboards in 5th. 3 days later he swears its not the same car. Better MPG, more power, problems all gone. We can only guess at what it actually did but, cleaned the injectors giving better MPG and power. Due to the higher cetane rating of BP Ultimate were sure it also helped the MPG and power but also allowed a better function of the DPF and EGR.

I'm not bet clues up on diesel but a faulty fuel heater should just cause running issues through a lack of fuel supply surly??