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2002 V70/T2.4 - engine RPM surges during idle when engine is cold V70-XC70

posted by  BZ on  Mon Jan 23 08:11 CST 2023
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last visit: Thu Oct 23 13:12 CST 2014
[RELATED]

Hello BB:

My wife's 2002 V70/T2.4 wagon (250K miles) RPM has started surging recently when engine is cold. As an example, now that the weather is colder, it does take a bit longer for the engine to start, then the RPM surges between 500 - 1100 RPM for a few minutes, then the RPM eventually settles at around 700-800 RPM when engine gets warmer. It does NOT stall and it does NOT appear to surge after shifting from "P" to "D", even when engine is cold.

We recently had both O2 sensors replaced, but other than that there was no related repair or maintenance performed in the last year. I think the fuel filter may need to be replaced (... not sure when I had this done last). I have not checked codes yet (but the check engine light is NOT on).

Lastly, Volvo did replace the Electronic Throttle Control Module about two years ago ($$$$$) due to a known issue for these vintage cars. At the time, the symptoms were different though: the RPM started surging under ALL conditions (even higher RPM when engine was warm), sometimes even stalling the engine, and the car eventually "died" and never started up again (had to have it towed to the dealer). 'Hope that is not the problem again!

'Any thoughts?

Thanks.

Bernie






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