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Function and Troubleshooting Charge Air Overpressure Switch

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90
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cslayman
Posts: 13
Joined: 28 August 2011
Year and Model: 740 Turbo Wagon 1988
Location: California

Function and Troubleshooting Charge Air Overpressure Switch

Post by cslayman »

Hi,

What is the function of the charge air overpressure switch? Does it cut off fuel when the turbo goes beyond a certain boost (what pressure?) Does it also retard the spark? And is there a good troubleshooting procedure to determine if it is operating correctly?

Thanks,
Charlie
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