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2005 S80 Dies When HOT S80 2005

posted by  Chris Mullet on  Tue Aug 18 12:00 CST 2020
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last visit: Fri Oct 24 09:08 CST 2014
[RELATED]

“... Ring any bells?...”

Yes it does, however in our case it was accompanied with a “Reduced Engine Performance” message on the DIM. Shutting the engine off and restarting would clear the problem and them it would repeat a few minutes later. Worse in hot weather. Our problem turned out to be the aging connection at the ECM.

Check for fault codes as Klaus suggests. Especially look for any related to throttle position.
Some things to try that don’t cost much money:

Remove the throttle body and clean it thoroughly.
Inspect the wire harness where it connects to the throttle body.
Remove the ECM, spray the contacts with electronics cleaner and reinstall - reseat it and unseat it a couple times to scrape the pins clean. ($15 tool required)
When the car is in limp mode check the fuel pressure at the injector rail schrader valve. A cheap Harbor Freight gauge is adequate.
Resist the temptation to take the car to a mechanic that wants to start out by throwing expensive parts at it.
Let us know what you learn.






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