[Seke]

Hello,

I have been struggling with this problem for the last couple of weeks. At low load my engine is misfiring and stuttering. It does not matter if I am running rich or lean, how I am changing the ignition and so on.. Always the same behaviour.

When on load the engine works great! Feels like good power and no stuttering at ALL!

It is a m52b28 turbo engine with Pazi88 PCB. It was running great with my old engine but with my new build I have some problems and my question is then, is it something obvious Speeduino hardware problem that can cause this? Will a bad IGT give me these problems?

/Andreas

[pazi88]

How's your cam timing? You said you have new engine. Wrong cam timing can cause that kind of problems (been there myself).

[Seke]

hm.. I checked the timing yesterday and the squares is perfectly aligned when placing a steel ruler on top.

[Seke]

If the case is that i missed to first tooth on the vanos, would it be possible that it could cause this?

[pazi88]

No it doesn't use cam trigger at all.

[Seke]

No it doesn't use cam trigger at all.

I am aware of that, but was thinking about if a incorrect installation of the vanos could be a problem. But probably not, have not even enabled VVT.

[pazi88]

Speeduino HW fault shouldn't cause it run badly at low loads and then great at high loads. For me it sounds like problem in you engine setup.

[CEK Garage]

Did you change injectors with this new build?

[CEK Garage]

I should explain why I am asking. I have seen similar symptoms when I converted a car from the stock injectors to larger injectors with a different opening time.

[roady]

I should explain why I am asking. I have seen similar symptoms when I converted a car from the stock injectors to larger injectors with a different opening time.

You should listen to this guy...CEK has made made some very informative speeduino videos on his youtube channel.