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Sounds broken? Cold start vs. Warmed up. 2.5L CS
Posted: Mon Aug 25, 2025 10:50 am
by webkris
Someone like 3-4 years ago said to me "Porsche is the only car that sounds absolutely broken on cold starts"
With the "diesel like" ignition on startup to warm up the catalytic converter, the direct injectors, the variable timing on exhaust and intake, it was so noisy the other day I recorded it. I switched to 0w40 for the last oil change and I'm seeing a benefit on gas mileage after 4K miles, but I am noticing more valvetrain noise (
specifically on the pass side).
After driving maybe 1+ mile around the block:
Sounds fine to me after a very short warm up.
What's your experience?
- Kris
Re: Sounds broken? Cold start vs. Warmed up. 2.5L CS
Posted: Tue Sep 02, 2025 6:03 pm
by webkris
The plot thickens - This is worrisome: P000B and P0014 was stored in the computer. It's Bank 1, which is the same "louder" right hand side. I have ordered new cam sensors and a solenoid. AND and oil report for my latest 5K mile change.
- PXL_20250831_031745319.jpg (516.09 KiB) Viewed 1033 times
Re: Sounds broken? Cold start vs. Warmed up. 2.5L CS
Posted: Mon Sep 15, 2025 4:28 pm
by webkris
Oil report back and nothing is showing any wear - AND the wear rate dropped from when I was running Motul 5W40.
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I went on a pretty long 300 mile road trip and a couple of canyon drives and the code has not returned.
I plan to swap out the sensor and the solenoid for bank 1 "the next time I'm in there"
** the Manganese was from fuel additives for track days
Re: Sounds broken? Cold start vs. Warmed up. 2.5L CS
Posted: Mon Sep 15, 2025 4:56 pm
by WillyDaP
The Pennzoil Synthetic is made from natural gas and the claim of running cleaner would seem to get an endorsement from your test. I sold vehicles for over 30 years and there are so many cars/trucks that rattle or sound noisy at start up I would definitely note it is not just a Porsche concern as you mention. In almost all cases it is just normal and once warmed up things are fine. That said you have codes so that is always something, imho, that should be checked/diagnosed by a Dealer.
Re: Sounds broken? Cold start vs. Warmed up. 2.5L CS
Posted: Thu Nov 06, 2025 3:30 pm
by webkris
WillyDaP wrote: Mon Sep 15, 2025 4:56 pm
so that is always something, imho, that should be checked/diagnosed by a Dealer
Unfortunately my local dealer is incompetent, owned by a giant AutoGroup, and runs a skeleton crew of underpaid 20-year-olds. Luckily I have several independent Porsche shops that support PCA and POC racers close to me if something I diagnose gets out of hand.
Update: I did some more investigation of the codes and it brings up two possibilities:
Camshaft Adjuster Solenoid - Part #: 0PB-109-259-C-M36
Camshaft Position Sensor - BOSCH 94660610600
The Solenoid was under $50 and the Bosch sensors are cheap.
Some of the track day guys report that the cam sensor gets absolutely cooked by the turbo exhaust and I can see that. It's located just below the coil packs on the passenger side bank 1.
- Cam_Sensor.jpg (360.81 KiB) Viewed 749 times
- Cam_Sensor_out.jpg (489.73 KiB) Viewed 749 times
I started by replacing the sensor and I haven't had the code or "extra" noise on cold starts for a month + now.
If I have to replace the solenoid, it's very similar to the location of the water pump (just above it to the left). Not great, but totally doable with quick-jacks and time.
Re: Sounds broken? Cold start vs. Warmed up. 2.5L CS
Posted: Thu Nov 06, 2025 6:15 pm
by Tom
webkris wrote: Thu Nov 06, 2025 3:30 pm
WillyDaP wrote: Mon Sep 15, 2025 4:56 pm
so that is always something, imho, that should be checked/diagnosed by a Dealer
Unfortunately my local dealer is incompetent, owned by a giant AutoGroup, and runs a skeleton crew of underpaid 20-year-olds. Luckily I have several independent Porsche shops that support PCA and POC racers close to me if something I diagnose gets out of hand.
Update: I did some more investigation of the codes and it brings up two possibilities:
Camshaft Adjuster Solenoid - Part #: 0PB-109-259-C-M36
Camshaft Position Sensor - BOSCH 94660610600
The Solenoid was under $50 and the Bosch sensors are cheap.
Some of the track day guys report that the cam sensor gets absolutely cooked by the turbo exhaust and I can see that. It's located just below the coil packs on the passenger side bank 1.
Cam_Sensor.jpgCam_Sensor_out.jpg
I started by replacing the sensor and I haven't had the code or "extra" noise on cold starts for a month + now.
If I have to replace the solenoid, it's very similar to the location of the water pump (just above it to the left). Not great, but totally doable with quick-jacks and time.
Great work and thank you for sharing the solution!!