misfires

2008 VOLKSWAGEN GTI
120,000 MILES • 2.0L • 4 CYL • TURBO • 2WD • AUTOMATIC
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MCHALE47
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  • 5 POSTS
mk5. we have rebuilt the turbo upgraded the inter cooler had the computer tuned etc etc. Over the last couple years but now we are both stump. My son kept getting a misfire code on # 4 cylinder so he bought new coils and it stopped the misfire then it started again just on 4 so he took back the coil got another new one and it worked now he is getting misfires on all randomly. I think there is a ground problem. I saw a wire in the loom that had been bent in half but still together. Do you have any ideas or could steer me toward the grounding schematic for the GTI?
Thanks Brian
Jul 2, 2019 at 10:16 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Hello,

This sounds more like an injector problem on #4 causing the coils to go out and the misfire codes. Here is a guide to help you test the injector:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Please run down this guide and report back.
Jul 3, 2019 at 1:52 PM
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