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Check Engine Light and ODB Codes 700 1990

posted by  DRG on  Wed Jul 31 14:49 CST 2002
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1990 Volvo 760 turbo with 143,000 miles.

In hot weather the car stalls frequently at idle unless you keepthe acellerator pressed. About 3 weeks ago the Check Engine Light came on.

About the same time, this normally smooth shifting car, the auto transmission began shifting a bit harder. It would appear that the engine has to rev higher than normal before shifting into a higher gear.

The diagnostic codes are :

Fuel Code Check: (Plug in position 2) Code 1-2-1 "Mass airflow signal
absent or faulty"

Ignition Code Check ( Plug in position 6) Code 1-4-3 "Knock sensor signal
faulty or missing "

Could these be related in any way?

Any suggestions on how to troubleshoot this from here would be greatly
appreciated.

Thanks





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