Persistent bad misfire

[ptootill]

My 1999 V40 2.0t has been great until recently (with 140,000 miles on the clock, I have done 130k of them). However, it has now developed a major problem in that it starts to misfire (on 2 cyls, I think) and eventually the engine dies. It only happens when the engine is hot (usually on a motorway - I have had RAC out 4 times!).
Can be better after a cool down and it is always OK next day at the garage - has been back each time but not fixed.
Have had new ecu (originally no fault codes) and a coil (based on fault codes). It worked for 2x130 mile journeys after coil but died today after 40 miles (warm day tho)
Any ideas - am at wits end, might have to sell but don't want to!
Rgrds
Peter

[alfonzobonzo]

i presume youve looked at your plugs recently?

Gap, colour, smell,

when was the last time they and the htleads were replaced (miles)

sounds like somethings breaking down with heat.

[ptootill]

i presume youve looked at your plugs recently?

Gap, colour, smell,

when was the last time they and the htleads were replaced (miles)

sounds like somethings breaking down with heat.

Thanks for the response....
Plugs were replaced recently - they look OK. One coil & ht leads done this week. The other was newer but I can't recall when it was replaced.

I'm sure you're right re the heat but what is it???!!!!! It's a devil to track down something like that

Has anyone heard of a regular problem with V40s? Is the 2.0T susceptible to heat problems??

Rgrds

Peter

[alfonzobonzo]

extract i found on the net, seems to confirm where wrere looking

"Engine Misfires when Hot

[Guest]

[quote="alfonzobonzo"]extract i found on the net, seems to confirm where wrere looking

"Engine Misfires when Hot

[alfonzobonzo]

nice one