Car stalls during idle after battery replacement, then fine after two days

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    Car battery
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SUMMARY

Replacing a car battery can lead to temporary stalling issues due to the Engine Control Unit (ECU) needing to relearn fuel-air-timing settings. This phenomenon typically occurs in modern fuel-injected vehicles and may resolve itself after a few days of idling. The ECU adjusts various inputs to optimize engine performance, which can explain why stalling may happen initially but not persist. The discussion highlights the variability in vehicle responses post-battery replacement, emphasizing the importance of knowing the specific make, model, and year for accurate diagnostics.

PREREQUISITES
  • Understanding of Engine Control Units (ECUs) in modern vehicles
  • Knowledge of fuel-air-timing settings in fuel-injected engines
  • Familiarity with the effects of battery replacement on vehicle diagnostics
  • Basic comprehension of vehicle maintenance and troubleshooting
NEXT STEPS
  • Research "ECU relearning processes in modern vehicles"
  • Explore "Common causes of engine stalling after battery replacement"
  • Investigate "Fuel-injected engine diagnostics and troubleshooting"
  • Learn about "Vehicle maintenance best practices post-battery replacement"
USEFUL FOR

Automotive technicians, vehicle maintenance enthusiasts, and anyone experiencing stalling issues after battery replacement in modern fuel-injected cars.

  • #61
Ranger Mike said:
symbolipoint had a question. is it answered to his satisfaction.

...nuff said
I've thought about splitting-off the digression, but because there doesn't seem to be anything more to say on the original topic, it doesn't seem to matter if it is split or not. Also, nobody reported the thread digression, so evidently nobody feels too strongly about it being a problem.
 
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  • #62
russ_watters said:
Yup, happened to me once. It's incredibly difficult to drive a manual transmission if you have to keep one foot on the gas all the time to avoid stalling.
Heel and toe for gear changing and hill starts is the essence of a good driver.
 
  • #63
tech99 said:
Heel and toe for gear changing and hill starts
For hill starts, I've always preferred the emergency brake technique (but that assumes a hand-operated emergency brake lever). :smile:
 
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  • #64
tech99 said:
Heel and toe for gear changing and hill starts is the essence of a good driver.
Early vehicles used a hand throttle, mounted on the steering column. There was no accelerator pedal in the model T Ford. Foot pedals were used to preselect a gear, then the other foot to operate the clutch.
 
  • #65
I learned to drive with a crash gearbox (no synchromesh) and have always wanted to do so again. When braking and slowing, you need to use the heel-and-toe technique so you can rev the engine in neutral whilst simultaneously braking. Sorry this is a bit off topic.
 
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  • #66
tech99 said:
I learned to drive with a crash gearbox (no synchromesh) and have always wanted to do so again.
Then compromise by avoiding use of the clutch. Adjust the transmission load to zero, then knock the synchro box into neutral, adjust the revs, then knock it into the next gear, and take up the load.
If you get the RPM wrong often enough, you will wear out the synchro rings, and end up with a real crash box. Have fun.
 
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  • #67
Baluncore said:
so why do people in the USA require so many cars to commute?
It's my precious and bus passengers smell. (Quote from a member of my family - and he's not even American)
 

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