Hi, I have recently bought a 2000 406 Exec 2.0l which is a beautiful car and is very tidy (it was the natural replacement for my trusty 405 auto that was recently a right off after 6.5 years). However it is not as smooth as it should be. Sometimes (but not always) the car has a rather rough idle which makes it feel like a diesel, it also seems sometimes to surge and drop back in power when driving. A friend describes it as a bit chunky. I have had it tuned and the chap was mystified by it. Apparently the ECU readings are all spot on, his thoughts were firstly a dirty fuel injector, or secondly the timing belt is out or lastly but doubtfully it needs a new coil pack.
I have since run through slick 50 fuel cleaner twice and have added slick
50 engine treatment to the oil. I have had the fuel filter replaced by my local garage and his thoughts were a sticky rocker. Since then I have MOTed the car at the same garage so the emmisions etc are all alright. I find it hard to believe the timing belt is out (though I think that the prev owner had this changed at the last service) as surely it would have much more severe effect if this is the case. Don't want waste money on a new coil pack on a whim - has anyone got any ideas?
Thanks in advance Euan