I thought, that it might be an indicator - but maybe this brings us nearer to what might be the cause...

One more thing - I had a look at my logs - in my case the misfires only happen between 14-18% TPS and between 75-95 kPa MAP.

 

Indeed you are

I've not had chance to ask, and James has said he's busy in the immediate future anyway.

But, do you ever go to/live near Birmingham?

 

No, but if it meant getting this fixed for the wider community it wouldn't be an issue to drive down there for a day to get it nailed.

 

Good to know, cheers Ben

 

i am going to log my car and see if i can reproduce this also. i have never noticed something like this. i have a 99 running ms2 with seq

 

Does this at least suggest that the issue is with the spark and not the fuel?

 

timing err% tells you jack ****.

 

Yeah, but I literally checked every other value in my logs in MLV and could not find any other evidence on what happens... (apart from the AFRs going bonkers and the rpm starting to swing)

 

That actually tells you the cause is external to MS. Thats something i guess

 

How can it be? every single MX5/miata running MSII & sequential exhibits this problem.

What that tells me is there's an issue with the code. It's not like this hasn't occoured before, a year or 2 ago there was an issue where you got 2 injections for the price of one at certain conditions.

Resulted in a stupid rich period and a stumble. Logs only told you the symptom, not the cause.

Thankfully DIYAutotune spotted it and scoped the injectors to prove what was happening, only then could/did the devs fix the code.

 

I have this ever since I went DIYPNP sequential, not before with the normal MS2.

and as Richy say, every 99-00 with sequential injection seems to get this.
The lean spike indicates an injection problem for me, as cutting out ignition would get me a rich spike...

I will do an composite log and send it to James.

One more thing I wonder about - are there any running MS3 sequential on 99/00 cars - and are thy experiencing the same hickups...?

 

Don't get me wrong, I expect the issue to be code too, was more suggesting that the issue might be external and particular to MX5, otherwise you'd think it would have other folks raising the issue over at MS Extra forums.

Maybe MX5s are the only bunch who tend run sequential, but hard to believe given the total number of MS users out there?

Let's hope an answer is forthcoming soon.

G

 

I do believe that I didn't have this problem when I had the MS3 installed for a week or so.

 

There seems to be a few Subaru wheel users who exhibit the same behaviour. So it's not restricted to the MX5.

It's also on both MX5 wheel patterns 89-97 and 98 - 2005

 

Well, I have a MS3 sitting in the belgian customs office since last friday. If it's anything like my other MS', I'll have it in a week or 2, with a big bill .
I'll report back on how it performs.

 

You should have contacted me, I have a 10-pack sitting here, it would have been in your doorstep in 2-3 days with no extra charges other than the usual EMS shipping cost.

 

Jean seems to have found the solution and has posted an corrected ini.

I am going to try asap.

 

Fantastic news!

 

I can only advice all of the 99/00 MIatas to go and flash this bugfixed code.

What a joy to ride a not bucking car! The car runs smooth as silk. No misfires, just plain joy!

I can't tell you how happy I am that this is solved!

 

Thanks for persisting with this Zaphod, I too am very happy it's been fixed!