2015 wrx - engine ticking
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This is a discussion on 2015 wrx - engine ticking within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi all, today I was leaving the dealership and merging into traffic when I heard a "ticking" sound (maybe 4-5 ...

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    2015 wrx - engine ticking

    Hi all, today I was leaving the dealership and merging into traffic when I heard a "ticking" sound (maybe 4-5 in succession) and noticed a puff of black smoke behind me. I was in 2nd gear at 4k rpm when I began boosting followed by the ticking sound during wot. Does this appear to be engine knock causing a rich mixture and should I be concerned or is this typical from time to time? The engine is stock with no modification. Thanks in advance.

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    Registered User batman900's Avatar
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    Wow, no not typical, sounds like knock. I had that happen on my 15 before the ECU recall came out which the dealer should have done for you? Never had any smoke after the knocking though, just loss of power and sounded terrible.

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    Registered User strudinox's Avatar
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    That would for sure freak me out. 11k miles so far on mine and never had this happen. It could have been a fluke, but if it keeps happening, definitely take it into the dealership again.
    ...BECAUSE RALLY CAR

    Current Build: 2015 WRX Premium - WRB - Stage 2

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    It's weird cause I did get the reflash and never noticed the knock before. I actually need to go back to the dealership for warranty work (inappropriate contact in the strut housing causing clunk) so I'll bring it up then and drive conservatively until then. I'll post an update next week or so. Thanks for the input guys!

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    Same thing happened yesterday on the highway except I was in 3 gear merging into traffic. This time I noticed power was cut and a shutter from the engine. I have also noticed rougher starts on occasion when turning the ignition. Idle seems ok though.

    I talked to a service guy at the local dealership today and he didn't have an answer for me. He asked if I threw an engine light, I said no. Also asked what kind of gas I used (i only use 93 from shell). Then he said if it continues to make the noise to bring it in and try to replicate it with a technician in the car. Since this issue is sporadic that may be hard to do.

    I did some searching on this and came up with possible scenarios...

    1. Wild ping - basically from a buildup of carbon that will ignite and result in knock and black smoke. Dit engine more prone??

    2. Crappy gas - I always fill up with 93 from shell so this is unlikely.

    3. Boost leak - some fxt guys were having similar issues and resolved it with tighter clamps.

    4. Bad stock tune - maybe it's time to get a pro-tune and dump the warranty.

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    Quick update...

    I brought the car in to the dealership and they could not reproduce the noise under wot. I changed to a different Shell station and haven't heard the noise since so maybe it was just bad gas haha.

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