Next step in troubleshooting miss fire issue.

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Car car was running horrible and had a massive PCV leak putting tons of oil into the intake only code was a MAF sensor code, replaced the MAF, replaced the PCV, removed and flushed all the intake pipes reinstalled and test ran, still ran like garbage and getting misfire and fuel system codes so I put in new plugs and coils (also did a compression test at that time 175-175-180-180 cold engine) and re tested still getting fuel system codes as well as hard cut when driving but no miss fire codes. I then replaced both fuel pressure sensors and still got codes and hard cut and while reading up on possible problems I was reminded that the intakes can gunk up on GDI so pulled the intake and did a walnut blast and had the injectors cleaned and tested, I reinstalled and and still getting fuel codes Wrote them down this time P0089 & P2293, replaced the HPFP and fuel system codes are gone but now getting P0300-0304 codes. Car is stock other than an tube style intake and 3" turbo back exhaust.

How long has your 2007 Volkswagen GTI had this problem?

<300mi

Visitor

in Mount Vernon WA

Jul 29, 2024

1 Reply

Popular Answer

DaveJMon Jul 29, 2024

Hello, misfire codes are going to be due to fuel injector concerns, ignition coil or plugs. Since you said it has new coils and spark plugs, it's hard to say that there is any further issue other than the injectors. It's way too hard to know though and I would not guess. Hands on testing is needed. There's a lot of component replacement going on based on guesses from trouble codes instead of test procedures. It's also difficult to know for sure if your modifications are affecting the vehicle in any way. Hands on testing from a shop near you is needed. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.

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