Suggestions Please - Rough Idle and Misfire under load

Good that you have some kind of equilibrium at 26 steps.

The standard fuel regulator keeps the fuel pressure at a constant 3 bar (+-0.2bar). If you have a fuel pressure gauge you can check the pressure.

One thing I have noticed with the F is that it can miss a beat in hot weather going up a mountain under load (changing up) but living at 500 meters +, does not totally surprise me. Recently we have had some high temps here (I do not know about where you live). The question is how often does it miss?

One last thing to try if all else fails is to delete all the ECU adaptions using Pscan (it is one of the menu items) and then allow the ECU to readapt. Not sure whether this would make a difference as the ECU should constantly be readapting.

Hi, sorry if the data you have put on would rule this one out, or if you have already tried and ruled it out before moving onto mor involved things..... im not so great with newer cars and many sensors, but I had similar issues with mine about 6 months ago. It would be lumpy under load and idle would rise to nearly 1250.

It turned out to be HT leads were damaged and arcing out to each other causing it to be a very confused ECU resorting to odd maps. Replaced with new and all is well. annoyingly they rub when driving, a few cheep clips to keep the new ones separate and 6 months on still fine.

Also on account of troublesome, they can have there moments, but the majority of parts are cheep, Ive found mine behaves far better with more use, compared to newer cars are more simplistic, compared to classics are far more reliable, and compared to rust issues on the sluggish MX5 and potential engine failure from a dodgy cat on MR2s.... HGF aside are quite reliable. Once through this rough patch im sure you will love it and it will love you back by behaving :drive:

James

Well, with the help of a local specialist we finally got to the source of the issue.

After a couple of stints working away from home followed by a holiday, I eventually got the car into a specialist. After changing just about every sensor over the last few months I was expecting something major, but my issues seem to have been caused by a dud connection on the VVC unit. He disconnected and cleaned just about every connector in the engine bay, and once put back together it fired up and idled like a dream.

I've been using the car virtually every day over the last week, and she's performing well with plenty of grunt and no hiccups. Its just a shame that she's fixed in time for the rain and cold weather!

Thanks again for all of the the suggestions.

Thank you for letting us know. Don't worry about the weather. There are lots of nice days to come and with the MG heater, if you don't need the wipers, youdon't need the hood.

I think I will have to do a How To for how to clean up all the contacts.