Hi Briskoda, having recently had the same problem as the title says ,our obd diagnostic tester had found the problem was a misfire on cylinder 1 so we replaced all spark plugs and coil packs it was back to normal for around 2 weeks.

 

And today it has done it again with the engine light turning on for a couple of seconds and then goes off and wont go faster then 40mph and struggled to rev at 3000 revs.

 

Any suggestions would be appreciated thanks 

Do a compression test.

If the compression test comes back as ok I would remove plugs and have a look at them to see if any are black etc then get it scanned again. It could be a bad new plug or new coil pack if it ran ok for 2 weeks. I have had random plugs fail within a few weeks before. From experience I now use Bosch or NGK if I can. If the scan comes up with misfire on no1  again you could swap coil pack and plug from number no2 to check. If its still scans as number one after that then I doubt its the plugs or coil pack. Could be a wiring fault to coil pack no1 or perhaps HT leads? 

Alasdair

Okay , I'll have a look tomorrow thanks 🙂

No compression figures yet?

The 1.2 HTP engines, especially the 6-valve version, are infamous for burning their exhaust valves. 

No amount of new plugs and coilpacks can help if that has happened.