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YOUR RESEARCHEngine running abnormally - air leak or air-oil separator?
Leading reported evidence
Run (not start), wait 60 seconds
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Suggestion
Put the key in and turn to RUN (not start), wait 60 seconds and then turn the key to off.
Engine running abnormally - air leak or air-oil separator?
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Leading evidence: 'Run (not start), wait 60 seconds' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run (not start), wait 60 seconds' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
My engine’s been running abnormally recently and I'm trying to figure out what it could be.
Engine running abnormally - air leak or air-oil separator?
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My engine’s been running abnormally recently and I'm trying to figure out what it could be. The car is a 2002 996 3.6 Targa. The issues that I’ve had intermittently are:
i) Rough idle fluctuating between 700-800 rpm. It’s slightly rough most of the time. But, there has been a few occasions where it been more severe and it seems like anti-stall is kicking in.
ii) High idle fluctuating between 1,200-1,400 rpm. This has happened a couple of times when the engine was warm.
iii) On one occasion, whilst the car was warming up, the engine kept cutting out in-between traffic lights over a period of about 5 minutes or so. I kept having to restart the engine with the ignition and giving revs to continue. The engine cut out 7 or 8 times and then was ok, albeit with a slightly rough idle.
iv) On one occasion, in the rain, when starting the car, the engine had trouble staying on. It started fine, but just died straight away unless I gave it some revs. This happened 4 times but was fine after.
There’s a hiss when the oil cap is undone whilst the engine is running. But there doesn’t appear to be strong suction as the oil cap can be removed fairly easily. The only code that I’ve been able to read from the car with my basic OBDII scanner is P0507 – Idle air control system RPM higher than expected.
I don’t know if there’s an air leak, or whether the air-oil separator is on its way out or something else?
Has anyone has any similar issues? Any advice will be appreciated.
Thanks
Before you do anything else, do an e-gas calibration. Put the key in and turn to RUN (not start), wait 60 seconds and then turn the key to off. Do not touch the accelerator pedal during the 60 seconds. You should hear some whining and clicking from the engine bay.
Do the E-Cal , then...
Once a modern Porsche starts running rough. STOP don't keep running it, there are some minor issues that can migrate to a more serious issue.
A blown AOS destroyed my engine.. It happened in seconds..
You may just have a bad CPS or other timing/air management sensor, cracked coil packs etc, but all of it means just getting the car in a garage (Yours or your Indies) and giving it a thorough checkout.
Fuel system
ignition System
Emissions system.
Regular scanners typically fall short of being able to talk to these cars,
Durametric, PWIS, a couple others. all north of 300 bucks the PWIS WAYYYY north.
This is a source reference. Confirm exact model applicability in the original material.
