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Old 08-29-2019, 01:01 PM   #1
foxbyt3
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Misfires, no codes

Hey all! A few weeks ago my 2012 GTI started misfiring. The misfires happen at full throttle. When they do happen if I release the throttle to around 90% the misfires stop and the car continues to accelerate normally.

I ordered up new coils and plugs but the issue persisted. Next I took her to my local shop for a closer look and they found carbon buildup which they then cleaned out. While doing that they also replaced the fuel injectors for good measure. I found some buildup in the air intake were the crank case hose connects and cleaned that out.

Unfortunately the misfiring is still happening. I've ran her hard a few times and doing an "Italian tuneup" but the issue continues.

I'm thinking of replacing the PCV and/or Crankshaft Position Sensor next.

Wondering if anyone has recommendations for further troubleshooting steps?
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Old 08-29-2019, 01:12 PM   #2
DASVDUB
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Sounds like a possible boost leak?


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Old 08-29-2019, 01:24 PM   #3
foxbyt3
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Originally Posted by DASVDUB View Post
Sounds like a possible boost leak?
Thanks! Didn't consider a boost leak could cause this. Good excuse to pick up a boost gauge

Last edited by foxbyt3; 08-29-2019 at 01:36 PM.
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Old 08-29-2019, 02:33 PM   #4
BudgetPhoenix
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How do you know they are misfires?
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Old 08-29-2019, 02:41 PM   #5
foxbyt3
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Originally Posted by BudgetPhoenix View Post
How do you know they are misfires?
The shop who cleaned the carbon buildup hooked it up to a computer and drove it around and they were able to see a misfire occur in cylinder 1.

I have an OBDeleven reader I haven't connected up during driving yet. I trust the mechanics at the shop, ive been taking my car there for years now, but I guess I should confirm their findings myself.

My butt sensor tells me its very brief loss of power, so I assumed misfires.
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Old 08-29-2019, 05:00 PM   #6
BudgetPhoenix
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Ah okay. If you have OBD eleven you should be able to monitor the live measuring blocks as well for misfires yourself. In the engine module go to block 14 it shows total misfire count and and if I recall block 15 shows cyl 1-3 individual misfire count and 16 shows cyl 4
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Old 08-29-2019, 05:18 PM   #7
foxbyt3
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Originally Posted by BudgetPhoenix View Post
Ah okay. If you have OBD eleven you should be able to monitor the live measuring blocks as well for misfires yourself. In the engine module go to block 14 it shows total misfire count and and if I recall block 15 shows cyl 1-3 individual misfire count and 16 shows cyl 4
I appreciate the info! I'm still learning to use the OBDeleven. I should be able to get it hooked up this weekend and tested. Ill report back my findings.
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Old 08-31-2019, 11:27 AM   #8
foxbyt3
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Some new info; car just started making a rattle sound yesterday. Sounds just like the timing chain rattle, and the sound is coming from that area... Unsure if these issues are related, but either way i'll be getting the car into the shop ASAP. Might have them check boost while they're at it.
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