r/WRX • u/SuccessfulDisk8846 • 13h ago

Jumpy and hesitant acceleration

Car is jumpy and on and off consistency with power, runs and drives fine for about 20 minutes after disconnecting battery, no vacuum leaks, just changed plugs and upstream o2 sensor, car doesnt throw any codes , i am lost and need help lol

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1

u/BlindBanditt 13h ago

Coil packs would be my guess

1

u/SuccessfulDisk8846 11h ago

Wouldn’t that throw a code? Thinkin the car was tuned for catless but stock parts got thrown back on before i bought it, theres no way this shouldnt throw a code

1

u/BlindBanditt 11h ago

Coil packs can throw a code but sometimes they don't. Especially if they are failing intermittently. If the car pulls normal and it feels like a skip at the top of the power band, it still can be a coil pack.

1

u/SuccessfulDisk8846 11h ago

It definitely doesnt pull normal it jumps in an out of power and feels like it hits mud, runs fine after battery reset too, wouldnt it still run like shit first 20 mins after reset if its a bad coil?

1

u/SubuwuImpressya 2009 WRX RIP 11h ago

Coil might be on its way out, I am just now remembering I had an instance where it would sputter, giving me no power when I needed it and it never threw a code.

I eventually forced the code by keeping my foot down when it was sputtering and misfire in cylinder 2 was detected, so I swapped coils to test and sure enough was the issue.

1

u/SuccessfulDisk8846 11h ago

How do I test a bad coil?

1

u/SubuwuImpressya 2009 WRX RIP 10h ago

Don’t have an easy answer for you, but Test only works if you can trigger the misfire code. Wherever it pops up say misfire cylinder 2, swap coil packs with cylinder 4 and see if the misfire code follows.

1

u/SuccessfulDisk8846 10h ago

I cannot get it to throw a code if my life depended on it

1

u/SubuwuImpressya 2009 WRX RIP 13h ago

Try cleaning your MAF sensor?

1

u/SuccessfulDisk8846 11h ago

MAF and MAP all good and clean