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The mkiv Supra Owners Club

Supra SOS: Flat battery and now running lumpy


charlton
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My Supra was running fine before my battery died after 3-4 weeks of not using it. After recharging the battery it started fine but it is now driving what I would call lumpy (slight vibration through car, exhaust and engine). The power has been massively restricted so maybe in limp mode and seemed like it was close to stalling (auto). I assume this is not running on all cylinders, distributor cap maybe? Spark plugs should be fine and changed within the last few thousand miles, max

 

Is there anything that a technically minded, non mechanic, equipment lacking hopeful can/should check on his drive before I get it recovered to the nearest garage?

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Hadn’t considered that as I didn’t have any warning lights, just watched a clip on YouTube and will pinch a paper clip from work and give it a go tomorrow, thanks

 

:thumbs: no probs mate, you don’t always get a warning light when a fault comes about. Just an easy and cheap way in ruling it out. :)

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If you are running a stock Ecu try disconnecting the battery again which resets the ecu

 

Sounds like the ecu has reset itself and now needs to learn its parameters.

Disconnect again and then reconnect after 10 mins and then go for a drive for around 30 mins. After that time everything should go back to normal. Be aware though that if u are in start stop traffic the car might want to cut out so best find a road where u can drive constantly without stopping.

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  • 4 weeks later...

Thank you all for the replies, I got a bit lazy and only just got round to putting some effort in!

 

New battery in and below was the fix. Fired up the same lumpy way, pulled out the road and it felt like it had a bit more give in it this time. Put my foot down, loud bang, stutter, then release! Just went on a 15/20 minute trouble free drive, how I’ve missed that!

 

Sounds like the ecu has reset itself and now needs to learn its parameters.

Disconnect again and then reconnect after 10 mins and then go for a drive for around 30 mins. After that time everything should go back to normal. Be aware though that if u are in start stop traffic the car might want to cut out so best find a road where u can drive constantly without stopping.

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