Misfire after jumpstart - Lexus IS Forum
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post #1 of 5 (permalink) Old 03-30-2019, 12:55 AM Thread Starter
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Misfire after jumpstart

My mom's car (Elantra) battery was dead so I jump started with my car (Lexus is300 2001). I did not drive my car that following day until the next day. On the next day I started up the Lexus I found out the battery was dead, no cranks, nothing. After jump starting my car, the car ran fine for 5 mins. It then started bogging down and hesitating with all the dash lights freaking out. I parked the car on the curve and it turned out the battery was dead again. I proceeded to jump start it again it but it hesitated and died. I installed a newer battery which started the car however there is now a multiple cylinder misfire. The car throws p0300, p0302, p0303, and p0306.

-At first, I thought it was an alternator problem but it was the battery.
-what could be the problem for the multiple misfires.

-The car had multiple misfires before but it was fixed by just restarting the car/ clearing the codes
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post #2 of 5 (permalink) Old 03-30-2019, 06:12 AM
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My mom's car (Elantra) battery was dead so I jump started with my car (Lexus is300 2001). I did not drive my car that following day until the next day. On the next day I started up the Lexus I found out the battery was dead, no cranks, nothing. After jump starting my car, the car ran fine for 5 mins. It then started bogging down and hesitating with all the dash lights freaking out. I parked the car on the curve and it turned out the battery was dead again. I proceeded to jump start it again it but it hesitated and died. I installed a newer battery which started the car however there is now a multiple cylinder misfire. The car throws p0300, p0302, p0303, and p0306.

-At first, I thought it was an alternator problem but it was the battery.
-what could be the problem for the multiple misfires.

-The car had multiple misfires before but it was fixed by just restarting the car/ clearing the codes
The misfires are just because of the low voltage. If you jumped the car and it ran for at least 45 minutes. The battery should have charged back up. If it keeps dropping voltage. Hav the alternator and battery load checked at the auto parts store. One or both may be bad.

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post #3 of 5 (permalink) Old 03-30-2019, 10:05 AM Thread Starter
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I've brought it in for testing and they said the new battery and alternator was fine. Could it just be the spark plugs or coil packs?
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post #4 of 5 (permalink) Old 03-30-2019, 03:13 PM
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I've brought it in for testing and they said the new battery and alternator was fine. Could it just be the spark plugs or coil packs?
It could be. I would try plugs, wires, Coils maybe. It is a good start to figure it out.

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post #5 of 5 (permalink) Old 03-30-2019, 03:16 PM Thread Starter
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I replaced spark plugs and now it only misfires on cylinder 6, I replacement have a coil pack on the way! I let the thread know what's
up after I replace it!
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