After installing giant a TMIC and a bigger fuel pump engine sputters when accelerating fast

2004 SUBARU WRX
157,000 MILES • 2.0L • 4 CYL • TURBO • 4WD • AUTOMATIC
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BIGBURK69
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  • 1 POST
Just put in a giant TMIC and a bigger fuel pump that flows more. Ever since I put them in the car has been sputtering when I would punch the gas. Drives fine at normal speeds and idles normal, no codes. I don't know if it just needs a tune? The engine was rebuilt so it only has 38,000 on it. Plugs were changed, the WRX ran great until I put these two in. Please help me.
Aug 17, 2020 at 4:00 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

The idea that you changed the TMIC doesn't concern me as much as the fuel pump. Are you certain that fuel pressures are staying within spec? Also, have you scanned the computer to see if there are diagnostic trouble codes?

If you have a live data scan tool, can you let me know what the long term and short term fuel trims are?

Let me know.
Joe
Aug 17, 2020 at 8:23 PM
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