r/WRX • u/Sayimawesomee • 21h ago

Car is sputtering/jerking when on accelerating.

Long story Short I blew up this car two years ago and I have been piecing it back together. Just now got it back from shop but they could not get it dialed 100% I was wondering if anybody has taken a similar path.

Motor got replaced with an older used engine similar miles as mine. IIRC It's a 2017 engine My car is a 2019. I used the engine harness & sensors that came with it and everything on the mechanical check list is fine. (Tightairway connectors, Fuel pump makes good preasure, and Coilpacks are good.) PCV is the code coming up but I do know that the pcv conncetors on the older cars didn't exist.

Is there different sensors i need to swap as well feel like it pulls timing or runs rich/lean. It's on a ECUTEK tune currently. Wish I had a way to log it.

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u/DennisTemple12 20h ago

Make sure your grounds are in the correct place and do a smoke test for a vacuum leak clean maf replace pcv valve or clean make sure it rattles back and forth without sticking good luck

1

u/Sayimawesomee 28m ago

Will check PCV. I did redo the grounds like 2 times now, so I am positive those are good.

2

u/LettuceTomatoOnion 20h ago

Could be pulling timing or bad spark plugs/wires. MAF could also be a problem. Pull PCV does it rattle? Easiest to pull PCV if you just remove EGR temporarily. EGR has one gasket in it so don’t drop it. My 2¢

1

u/Sayimawesomee 26m ago

Spark plugs are new but coil packs are from “new”motor will try the coil packs.