[skanoodle]

Hey all, lately I've noticed this knocking noise develop on cold start, I don't have any codes and the logs I've taken don't show any knock detected. the noise goes away after the cold start process is done. Any idea what's going on?
from the outside it sounds like the engine is cutting in and out, from the inside I can feel a thump each time the engine cuts.

new oem plugs, new oem coils, MPE, AA DP, stock intake, vrsf 5" FMIC, FTP pipes and BM3 stage 1 93.

https://youtube.com/shorts/B_xIARXEhSQ?feature=share

[///M TOWN]

Almost sounds like a boost leak of sorts

Have you driven it since these mods?

[skanoodle]

Originally Posted by ///M TOWN

Almost sounds like an exhaust leak

Have you driven it since these mods?

yea I have and it drives fine, I did notice the fitment for the AA dp wasn't the best, might have a look tomorrow. sound goes away after the cold start procedure is over.

I did have the cold start procedure disabled through bm3 for a while, noticed it started to do the knocking/cutting noise so I tried reenabling it but as seen in the video no dice.

[skanoodle]

latest log for reference, timing is all good during this short pull
boost seems good too

https://www.bootmod3.net/log?id=62ac...729b027cd63047

[skanoodle]

seemed to be better this morning, only had the engine cutting sound once. Still not sure what causes this to happen

[///M TOWN]

Did you replace the v bands and the gasket on the down pipe?

[skanoodle]

Originally Posted by ///M TOWN

Did you replace the v bands and the gasket on the down pipe?

that might be the culprit, had to reuse the stock clamps and the gasket was impossible to fit on, i'll look for a replacement

[///M TOWN]

Originally Posted by skanoodle

that might be the culprit, had to reuse the stock clamps and the gasket was impossible to fit on, i'll look for a replacement

Yea that's probably it

LMK

[skanoodle]

Originally Posted by ///M TOWN

Yea that's probably it

LMK

just installed the gasket from my old DP, no difference really. Not sure what it is, sounds like there's some kind of back pressure on cold start. Car runs perfectly otherwise

[///M TOWN]

Originally Posted by skanoodle

just installed the gasket from my old DP, no difference really. Not sure what it is, sounds like there's some kind of back pressure on cold start. Car runs perfectly otherwise

The v bands should technically both be replaced

[skanoodle]

Originally Posted by ///M TOWN

The v bands should technically both be replaced

hmm alright, I'll order a set of new parts and will update this when the new clamps and gasket are in