Hello

I have posted few days ago an topic and i have ewplained my problem .But now the situaton has changed a litlle bit.
So the problem is folowing :

When the engine is warm , i have problems starting it , it cranks good but will not start i have to crank for about 7-13 seconds . I have puted new orginal spark plugs but nothing has changed.

When you drive in 4 gear the angine comes to 2900 RPM and imidiattley looses for about 300-400 RPM , it makes strange nois and imposibille to acclerat in the same gear , the same thing hapens in 5 gear but it starts with 2200 RPM ,also it is imposibile to acelerat.

I have changed the ATF Fluid but the delaer sad that i should not change the ATF filter ,so he just cleaned it and put it back. Nothing changed.

Few months ago i had an DTC code P0421 and P0431 , Warm up catalyst below threeshold Bank 1 and Bank 2 , I have replaced all four o2 sensors and till now nothing came back , but it allso did not fixed my problem .

Now i was on a bussines trip , and the Mil goes on , i scanned it and it showed P0431 Bank 2 , Warm up catayst.
Now i do not know waht does it mean , have i fixed the one bank , but the other catalyst is damaged? Can the catalyst be the couse of my problem ?

Before i forget , i have never changed the petrol filter , the dealer sad that my model does not have one, he sad that i have one incomporated with fuel pump but that one i have not to change. Can these be the couse of my problem?

At the end i have to ask kindlly to help me , it has past more then a year in fixing the vehicle but i did nothing beside of paying money , i have to say more then 1500 euro .

Best regards
Vedran Eterovic

From your description I would say its either a fuel supply problem or the ISC/air mass meter which controls the fuel ratio on the intake. First step would be to get your fuel pressure measured and if low change your filter (it does have one) and look at blocked lines into your pump (which is in your tank). Numerous people have had this problem so I would say its a common fault either with the pump itself or corrosion in the tank causing excessive blockage. One thread in this forum descriped intermittant ground connections with the pump causing similiar problems as you describe.

I have never worked with the ISC/mass meter but understand its also a common weak point. Not sure about your year/model but I will attach a link that descripes some of the more common problems.

http://www.bba-reman.com/content.aspx?cont...air_mass_meters

Jim