strange behavior when engine is cold

[kotbehemot]

Hi,

These days i have strange problem with engine. It only happens when engine is cold. It happend 3 times in last 2 months of daily driving.

While on iddle or slowly accelerating it behaves as it would get fuel cut (not possible - i have boost gauge).

Check engine light is turning on for few seconds - as error codes it shows only No 12.

But it was always there (standard ECU) and caused most probably by starter (you can hear hesitating while starting engine).

Patient is LHD EP82 swapped with 4E-FTE.

HT leads are new - from Magnecor.

Spark plugs were checked - are ok.

Ignition coil was changed to brand new.

Igniter was also changed - to used one , but to have same symptoms for 2 ignitors ... ?

Battery is new - fully charged.

Boost gauge didn't show any overboost (more then 0.85 bar).

Did somebody had already this kind of problem?

In my opinion it can be caused by somekind of sensor (air temp or MAP ... ). Any suggestions what should be the first check?

I am looking for your help , because this kind of engine is not popular in my Country ;-)

Edited October 7, 2013 by kotbehemot

[kotbehemot]

Today i had strange deeling that my problem can be caused by dizzy and rotor arm.

I checked it in spring 2013 and was ok but i decided to check it again - there are only 2 screws.

And it was good idea , because i saw this view:

It looks like that pins are quite used and rusty (were ok few months ago).

Most probably it is the cause of that strange fuel cut.

I have grinded those pins a little bit with sandpaper go get rid of that white coating.

After that, engine startet faster then normal and seems to be working steady.

Tomorrow i will make longer check.