Why does my W202 need a MAS

Discussion in 'Engine' started by JDP, Aug 12, 2006.

  1. JDP

    JDP New Member

    Messages:
    1
    Joined:
    Aug 12, 2006
    I have had a problem with my W202 for a few weeks where in the morning, especially when it is cold it mis-fires a lot and there seems to be a complete lack of power until the car warms up. Having read some threads on MAS problems I disconnected the MAS unit (un-clipped it) and like magic the car seems to be transformed. No more mis-fires and performance is like it used to be before the problem started. If I reconnect the MAS the problem comes back. My question is, why should I replace the MAS unit? Can I simply not leave it disconnected. Can anyone help.
     
  2. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    The MAF (MAS) senses the amount of air being injested by the engine and alters the fuelling and timing to suit.
    With it disconnected the ECU adopts limp home mode and runs a pre set map which will err on the side of caution. Your car won't be delivering full power or economy without the MAF connected.
     
Tags:

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.