2002 S60 car stalling at stops and during low speed turns.

[abscate]

The battery was not 17 years old. It showed May 2019 on it. You will never get even close to 17 years with our heat. Five is doing well here.

Draining a healthy battery does cause it to fail according to my mechanic. He tested it several times last night, and it is bad. He tested it when I bought it and it was over 90% at that time. See what I said above about going past the point of no return with the voltage. I said amps, but meant volts.

Mech did disconnect battery while he was cleaning throttle body.

He is going to go over it in a couple weeks and give it everything it needs. Thanks for suggestions.

Though I put in a new Exide battery this morning(SX-H6/L3/48 750CCA)it has since stalled twice. Once during coasting to a stop, and then when fully stopped. Temp was 96, with ac set to 64 and fan halfway to max. Radio was also on at time. It’s still hesitating from a stop, though it is a little better. So I don’t know what to say. The problem persists. Better is not acceptable. Waiting to hear from mech.

Draining a May 2019 battery once in June 2019 will not kill it. Put it on a charger for two days and then test state of charge, not just voltage, after removing surface charge.

You should have a warranty on that battery in any case.

My mechanic says when a cell dies and available amps go below 10 amps Volts, it is past being able to charge back up.

The alternator might have trouble charging this, but an external charger will bring back a good battery discharged far below this voltage

[MDK]

Ok 141... perhaps part of your topic is solved. See that your vehicle is 17 yrs old ... regardless of the mileage. I'm thinking you may have a vacuum leak somewhere ... just thought I'd throw that out there. It's really going to take a good shop to give your S60 a thorough going over. Curious to see what they find...

[DrDan]

Hi, I'd also like to share some thoughts on this. 1. It is possible that your ETM is starting to fail due to the well known but dreaded syndrone caused by wear of the throttle position sensor even if mileage is low. Mine started acting up at about the same mileage, but it took another 60k miles until it threw a code. The sweep test also gave no decisive evidence. Intensity of symptoms is loosely temperature dependend for me (hunting for idle, especially under load, e.g. when air conditioning is on. Sometimes it almost stalls).
2. Draining and disconnecting the battery might reset ECU adaptation (fuel trims), and thus, erratic behavior can result because the programmed defaults don't match. This might point to other sensors which are starting to show their age, e.g. MAF. After some time of adaptation, the ECU may be able to compensate (for now).
3. As MDK points out, a vacuum leak (unmetered air) might be the cause, possibly compensated for by the ECU after adaptation but enough to throw things off without adaptation.
4. Given that you only own the car since two weeks, your noticing the symptoms after the battery drain could be pure coincidence.

I would recommend to proceed by having a sweep test done (1) and check fuel trims (2 and 3).