hello

i have a 95 C36 AMG and a my brother has 95 C280,
I just bought a actron code reader. on the C36 i pulled two codes P0400 and P1700,, looks like the EGR malfuction and a upshift problem, anyone have some imput on fixing it ?

But with the C280 when i try to pull codes it ALWAYS tells me fail on the the reader? what does this mean ?

Both cars drive fine without any problems??


thanks

190e 16v
190e 16v
C36 AMG

On the C36 it sounds like the EGR valve is not working or the EGR pipe from the valve to the intake manifold is plugged. The pipe usually plugs at the manifold end. It can be cleaned with some difficulty by removing the intake pipe from the air cleaner, opening the throttle butterfly and poking with a wire or such. Some folks run a speedometer cable through the pipe with a drill. For the upshift delay it is either a problem with the upshift delay solenoid valve (in the double firewall are on the pass side) or the vacuum chamber in the throttle position cable.

On the C280, the only time I've had a communication problem was when the OVP relay was bad. It feeds power to the diagnostic module.