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2002 Porsche Boxster 2.7L Idle Issue – Stalls Below 1K RPM

PorschesInTheRain
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PorschesInTheRain Member

PorschesInTheRain

Posted
Posted

Hello everyone,
 

I recently purchased a 2002 Porsche Boxster 2.7L Base model and have been tackling some maintenance and repair work myself. It's a 5 speed tiptronic transmission. Here's a summary of what I've done so far:
 

- Replaced the air oil separator (AOS)
-Replaced the oil filler tube
- Replaced ignition coils
- Replaced engine and cabin air filters
- Replaced the thermostat housing
- MAF sensor

I'm now facing an issue where the car struggles to stay alive during idle. When the RPM drops below 1,000, the engine dies immediately. It struggles to stay at 900 RPMs I've checked the oil dipstick hose and noticed the middle section is loose. I repositioned it to get a proper reading, and it shows the oil is full. I plan to drain a little oil to see if that resolves the reading, but I doubt it’s related to the idle issue.
 

Porsche quoted me $25K for total diagnostics and repairs, which is out of my budget. Before taking further steps, I wanted to ask the community:


What could be causing the idle issue?
Are there common culprits to investigate first?
Would a vacuum leak or failing throttle body be the likely cause?
Any suggestions for diagnostics or specific tests to perform?
For more context, I’ve documented my progress on this car, and you can check out my videos here:
 

YouTube Video 1
YouTube Video 2

Your insights would be greatly appreciated!
 

Thanks in advance,
PorschesInTheRain

2.JPEG

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