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Cold start issues - LPFP, HPFP, Injectors replacement - Results

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ZoliWorks:

--- Quote from: Mekaniko on March 04, 2025, 04:50:08 pm ---My Mk5 GTI cold starts sounds the same as on your videos every morning...

--- End quote ---

I still dont think it's fine but it is what it is, I gave up. As long as it starts, it's ok I guess...

Earlier today, 12c outside, it started like a diesel at -20: It started cranking, puffed about twice, died again, then cranked for a bit more and finally started. Take a look at this video on reddit. It was basically that but 2x longer

https://www.reddit.com/r/GolfGTI/comments/1al3gxc/mk5_bwa_rough_cold_starts/

mjmallia:
That does not sound right for sure.

ZoliWorks:
Okay I did not think it'd do it again, but surprise! it did... It's 16 degrees celsius outside and you've been sitting in a garage! Why cant you just be normal?!

I gave you brand new injectors, brand new high pressure pump, brand new low pressure pump, new n80 valve, new o2 sensor, the cam chain was done with all new INA parts, including the VVT adjuster and solenoid! and you've been carbon cleaned last year...

mjmallia:
Are you sure the timing is good still on the chain and belt?

If a tooth out on either one, that would def make a hard to start scenario

ZoliWorks:
At idle, the chain is sitting quite happily at 1.0 KW when warm but the adjuster is at 26-27 KW even when the requested is 28 KW. The belt hasn't been checked since last year but back then we checked 3 times and both marks were on spot.

I need to take a look at those VVT adjuster ring seals. Those wren't changed and they are rubber/plastic on this engine as far as I know.

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