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Erratic Idle and hot start issues V70-XC70

posted by  KlausC on  Tue Jul 9 18:46 CST 2013
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last visit: Fri Oct 24 10:15 CST 2014
[RELATED]

The ECT also drives the instrument gauge. If the gauge is always cold, it could be a broken thermostat as well as a bad ECT sensor.

The ECT sensor is linier, so when the coolant is hot, the resistance is around 240 Ohms. 500 Ohms for one at 90F.

Unplugging the AMM is not wanted so long as the engine runs well at higher rpms. That will trigger a CEL - and never unplug or plug it back in while the engine is running.

If you have a NA engine, check the hot air feed at the air box. If the vlave is always closed to fresh air, the MAF/AMM will cook.
--
Klausc, a Volvoholic






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