Vac Hose plug on a 1992 Micra 1.2 SLX

[Chris Smith]

My Micra was running a bit lumpy, nothing terrible but a bit jerky on acceleration, very annoying. So I went looking for a cure.

I read somewhere that if you partially block the vac hose with a rubber bung that has a 1mm hole in it - running and acceleration immediately improve. So I tried it.

And it is correct, no more lumpiness, car pulls quicker and more smoothly.

How can this be true?

 

[infinity]

Block the vac hose from where? To where? Fuel regulator??

 

[Chris Smith]

I am talking about the crankcase ventilation system. The hose that emerges into the air filter housing which is roughly 10mm in diameter. I have plugged it with a solid nylon plug with a 1mm hole drilled through the centre.