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Re: 1986 Volvo 740 Turbo failing NOx
Posted to Emissions Forum on 11/29/1998 1 Reply

Mike,

The issue with the timing is easy...There is a temp switch I believe is in the lower radiator hose, that the ecu uses to sense engine overheat. If the ecu is sensing overheat, it will bump the timing up as you describe. Does the timing seem to come clo... Login to read more.

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