help with codes on slk 230
 

my car was spuddering when I hit the gas at times and the gears arn't changing at right time, here are the codes I got. What do I need to do thanks

P0170 Fuel Trim Malfunction bank 1
Po304 #4 cylynder malf
p0302 #2 cylinder malf
Po300 multiple cylinder misfire

The codes you have and the way you desribe the problem it is a bad air mass meter, Didn't you already post about this?

yes I did, but I didn't have the codes before, ouch a air mass meter is expensive. Can I use electric cleaner first?? where is this mass meter?

AMM is in situ with the plastic intake runner on top of the valve covers.

Check FASTLANE throught this site for price,

make sure you install it without prying and cracking any of the intake runner, just undo all the simple connections - easy.

it is a round hard plastic cylinder with an electrical plug attached to it

don't put your fingers on the working parts of the new AMM when installing

Some people have bought a little time with cleaning it, but most of the time it does not work. And eventually, regardless of cleaning or not, it fails completely.

You could take it to a tech for a more thorough diagnosis, and have the adaptation values read. This would mean that you would not take the chance of buying an Air Mass Meter for nothing. However, as already stated, the symptoms and codes do lead to the AMM...

From what little I know ;) , I believe it may be worthwhile looking at the ignition coil that fires # 2 & 4 cylinders.
I DO KNOW that a misfire is interpreted by the oxygen sensor as a lean mixture ( lots of oxygen in unburned fuel ), and could therefore be responsible for the fueltrim code as well. ;)

thanks guys, I took it apart and tried cleaning it. It didn't work that well, so I am ordering part tommorow. thanks again!

Be sure to install a new air filter with your new air mass meter.;)