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About jchapura

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    Contributing Member

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  • From
    Puget Sound
  • Porsche Club
    PCA (Porsche Club of America)
  • Present cars
    2005 Carrera S

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  1. It is normal to see rubber bushings deteriorate with time and usage. The deterioration accelerates in high stress areas. Normally, bushing "separation" would lead to "clunking" sounds but even if those are absent, if it were me, I'd plan to replace the parts "next time I was in there" (perhaps when doing other maintenance items). I replaced a lot of the "harder to get to" parts even though they showed minimal issues, when I switched to Ohlins coilovers. Rubber/stressed things just don't last forever.
  2. Can the Porsche (PASM) shocks be rebuilt by Bilstein or others? Is there a reference to how that rebuild process gets initiated?
  3. As far as I know, the Primary AOS on the 997.1 3.8 is not serviceable by draining. Have you checked your crankcase vacuum? Either with a manometer or the oil filler cap removal resistance method? How old is the AOS? If not original, is it genuine Porsche? Any squealing, screeching noises? Do you park on an incline? Is the smoke persistent or only at start up?
  4. Well, at least not charging "flat rate" or "book rate". 😉
  5. I'm not sure. I've heard it's best to stick with a Porsche branded pump (rather than even the OEM Pierburg).
  6. Thanks for sharing. That's quite a failure mode. Never heard of the prop shaft just snapping like that "out of the blue". You lucked out that the impeller didn't wobble into the block (and shed plastic) while it slowed down. I replaced mine about 4 years ago. The replacement period consensus I gathered was to replace at about 40000 miles. Definitely replace the thermostat at the same time. And other things, as you mention. Happy motoring.
  7. When you say "swapped" coil/plug - do you mean for another position? If so, it will be interesting to see if the code follows it. Then you'll know. How old is the gasoline in it? Even couple-month-old gas can be "flat". And cause misfires. Generally though, not at a single position (unless of course it was on the "edge"). I think there's consensus to change the plugs around 40k miles or 4 years, whichever comes first. It's my understanding the 4 years is motivated by trying to avoid damage to the aluminum head because the plug threads adhere themselves to the head threa
  8. Do you think a lab could distinguish between the chain guide ramp material and Techroned-off "carbon deposit" material? If it were Techroned-off carbon deposits, would you be more concerned with allowing the carbon to build by not Techron-ing versus getting the slug of carbon every oil change? FWIW, I use a Top Tier gasoline at least 80% of the time...
  9. I had my oil tested and nothing remarkable seen there. Coincidentally, a fellow Rennlister had an issue similar to mine but on a BMW. The current working theory is that it was carbon that had been broken loose because of the fuel system cleaners we'd both used prior to the oil change. Found fine black powder in oil filter medium - Rennlist - Porsche Discussion Forums RENNLIST.COM 997 Forum - Found fine black powder in oil filter medium - Changed my oil today. 2005 C2S with about 80000 miles. Been using DT40 for a few years. About 3300 miles
  10. Thanks Loren. The grommet is holding the sensor ok in its natural position. I check it quite often since my fan being on really gets my attention. I was thinking of 1) reversing the sensor position or 2) insulating the sensor tip. All in the hope of delaying the fan start to its design value. Is it possible another temp sender (oil, coolant?) is broken that is part of the purge fan control logic?
  11. 2005 C2S about 80000 miles What are the possible causes for the engine compartment purge fan to come on early? The old sensor exhibited the same thing. The new sensor is about a month old. I was checking the cam deviations with my Durametric and I noticed the fan come on only after about 5-10 minutes after the engine had started up (from a true cold start). The ambient temperature was about 55 degF. The Durametric showed the engine compartment temperature about 41-44 degC (much cooler than I thought was supposed to kick on the fan).
  12. Thanks John. After warm-up: Camshaft deviation, bank 1 -0.9844 Camshaft deviation, bank 2 -0.4219 Rock steady, no jumping around at idle nor 2700 RPM. What do you think?
  13. If it is, is it more troubling if it seemingly cropped up over the span of a single oil change interval? Am I on a "deadline" now? Are the chain ramp replacements considered a DIY job without removing the engine? Special tools needed? Other considerations?
  14. I used a wash bottle with lacquer thinner and washed about 1/2 the medium's debris into a clean glass container. Decanted it once. Washed it again. Decanted it. Let the solvent evaporate a little bit and scooped a couple of screwdriver tip's worth onto a clean paper towel. It was still a little wet as you can see by the staining on the paper towel. Picture is attached. The clumps are easily pulverized. The color is brown-reddish-brown. PS: I think I'll get the Durametric out and measure the cam (angle) deviations...
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