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S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
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Car won't start checklist....Views : 5384 Replies : 77Users Viewing This Thread : |
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Jul 6th, 2017, 12:07 | #11 |
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Is it worth investigating the immobiliser? Very recently had a friend with 60 plate Smart car. Left lights on over a weekend, totally flat. Wouldn't do a damn thing even after a jump from another massive battery, half hour fast charge etc etc. Search on the net suggested the answer was locking/unlocking/rocking the car combo. Bizarrely it worked!
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Jul 6th, 2017, 13:21 | #12 |
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Yes, if all the other data had checked out but currently the low cranking rpm means that the ECM won't fire the injectors.
Until the basics are covered, investigating anything else isn't really useful. I'm confident it'll fire up first time with a new battery.
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2002 S60 SE D5 Manual 209000 miles |
Jul 6th, 2017, 14:43 | #13 |
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Thanks for pointing this out. The S4 is indeed 'only' rated at 720CCA.
I'm swapping it for an S5 on the way home from work (and that is 800CCA !). That's one big pricey battery. I'm aware that I probably could have got a dealer to replace it for less, but car is stuck on driveway and dealer is not on route to work....and I like Bosch batteries.
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V70 D5 185 SE Lux P3 (with rear integrated booster seats, which the kids love !!) |
Jul 6th, 2017, 15:34 | #14 |
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Jul 6th, 2017, 18:23 | #15 |
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How much can a battery on its last legs affect the way the car runs? Since mine was changed the car feels different/better whether that's just in my head or not I don't know?
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V70 SE LUX 2011, 205hp, manual |
Jul 6th, 2017, 18:26 | #16 |
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I'm no expert but I believe funny voltages etc can affect electronic modules. Mind you, my car definitely goes faster and drives better after I've washed it!
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Jul 6th, 2017, 18:51 | #17 | |
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Quote:
On a more fundamental level, a dying battery needs a larger current output from the alternator which in turn requires a stronger magnetic field that creates an extra load on the engine. Now that you're sorted, I would check the electrical system to ensure that the previous battery failure was isolated and not caused by something else.
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2002 S60 SE D5 Manual 209000 miles |
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Jul 6th, 2017, 19:35 | #18 | |
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Quote:
It didn't start on its first attempt, but after waiting 10 minutes, I tried again and it powered up nicely, no hesitation. It cranks much quicker now Comparing the Torque log outputs this time, on start-up, the ECU voltage dropped to its lowest reading of 9.87V at the same time the engine had reached 137rpm with 5769psi at the fuel rail. The Torque logging interval isn't quite small enough as the next entry has the engine at 1011rpm, fuel pressure at 5863psi and ECU voltage at 11.02, and that's the point at which the Mass Air Flow Rate suddenly jumps, which I assumed means the engine has 'fired up'. So I can't quite tell what at what engine speed injection/ignition began (I'd need to be logging hundreds of times per second to obtain that granularity). Yesterday, the engine speed didn't go above 160rpm and wouldn't fire, so it would have been interesting to see if today, the engine did fire up at about that same engine speed (160rpm or slightly above), which could imply the new battery was helping other aspects of the engine (as hinted in the previous comment from CheshireD5). But I'm going to assume it started because the new battery allowed the engine to quickly reach 200rpm and above. It was nice to see on the log that after driving around for a few minutes and then turning the engine off, the battery rested at 12.93V, which is a nice healthy voltage. Oh, and unsurprisingly, the windows move up and down quicker, the mirrors fold in quicker and finally the rear RHD central locking works ! I guess it all just needed a bit more juice. Obviously I can now say I should have changed the battery before, but I like to get the most out of old batteries and use my CTEK conditioner to keep it going. Interestingly, the old battery was at least a Volvo marked item (so not crap) however, it's CCA rating is 700A, which isn't correct for this model of Volvo. I'd be interested to know how old this battery is:
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V70 D5 185 SE Lux P3 (with rear integrated booster seats, which the kids love !!) Last edited by Semnoz; Jul 6th, 2017 at 19:43. |
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Jul 6th, 2017, 19:58 | #19 |
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The year and week number of the first charge is stamped on top of one of the terminals.
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2002 S60 SE D5 Manual 209000 miles |
Jul 6th, 2017, 21:53 | #20 | |
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Quote:
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V70 D5 185 SE Lux P3 (with rear integrated booster seats, which the kids love !!) |
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