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Old 01-23-2021, 10:26 AM   #16
FR-S2GT86
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Quote:
Originally Posted by Btborja View Post
So i tried unplugging maf sensor, got nothing. The ecu is well grounded. How do I check map sensor pressure? I’ve looked at a few ways to do it. Wasn’t sure if there was specific way on these cars. Once again one thing I get when cranking engine is it’ll backfire. I’m assuming maybe cause there being fuel and spark but car not starting
This really sounds like a timing issue when you’re getting backfire (through the intake?), like when a carbureted engine shoots flames out the carburetor when the timing is off by 360 degrees.

Are you certain that you have the coil packs wired correctly on each side of the engine and not have them reversed? You can swap the connectors between each set of coils on each side to test this.
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