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JFP in PA

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Everything posted by JFP in PA

  1. JFP in PA
    ATF is always cheaper than a new trans..................
  2. JFP in PA
    It has long been our opinion that the factory Tip service intervals are too long. Many of our Tip equipped customers have theirs done 40-60K mile intervals, sooner if the car is tracked. I'd change it.
  3. JFP in PA
    The rotating assembly (rods and crank). I would not be attempting any further investigation until the car is flat bedded to a properly equipped shop.
  4. JFP in PA
    That alternator voltage is also bit low, I would also consider having the alternator load tested; you may have a voltage regulator on the way out.
  5. JFP in PA
    Problem could be differences in grip front to rear, which can be considerable, but is often more of one of "rolling diameter". If you have ever watched an NHRA top fuel car do a burnout and have the tires grow in height by nearly a foot, you have seen a visually extreme example of rolling diameter in action. All rolling tires grow due to the impact of speed induced centrifugal forces and their own weight. Because your car has asymmetrical sizing (front and rears are different sizes), the rears will tend to grow slightly more due to their heavier weight compared to the fronts. Add in the wear differences and it compounds the issue. The clue was your comment about the PSM invoking at a lower speed on the same turn; the difference in front to rear diameters fed the PSM differential wheel speeds outside the limits of its algorithm, and it suddenly thinks you are in trouble when you are not. A lot of Boxster owners experience the high rates of inside wear on the rear tires. Usual mitigating factors are the car's four wheel alignment specs and general driving style. Those that push the cars harder seem to see accelerated wear.
  6. JFP in PA
    You can probably find something online, but be aware that a smoke test machine is not an inconsequential purchase, but you might be able to rent one. This might also be a good job for a well equipped shop to handle.
  7. JFP in PA
    What gear oil is in the car and when was it last changed? You can replace a five speed with a six speed, but you will also need to change some other parts as well to make it work, which could make the swap a bit pricey.
  8. JFP in PA
    Sounds like the tires are mismatched and the system is seeing it as a reason to kick in. Front to rear mismatch can do this.
  9. JFP in PA
    The control unit codes you are throwing appear to be on the CAN bus, which controls a lot of stuff in your car, and these are often voltage related issues. What battery voltage and alternator output voltages are you seeing?
  10. JFP in PA
    I would also consider checking the charging system, weird MIL lights are often voltage related.
  11. JFP in PA
    I'm obviously biased as I am a "solid third party"; but I can tell you that we see a lot of very new cars due to dealership pricing and service issues. A car without a history is always a gamble, which should be reflected in its resale price. But regardless of the car having a history or not, you should always have an independent pre purchase inspection done by a knowledgeable shop.
  12. JFP in PA
    The Durametric can read boost as pressure at the throttle plate, but it has no way to detect leakage. It will give you sensor values in milibars. As this value can vary based upon ambient conditions, temperature, tune on the vehicle, etc., the values read can vary. If you had an "under boost" situation, I would expect that the car should be throwing a code as well.
  13. JFP in PA
    The clutch assembly at the front of the compressor has a large bearing in it, which can seize. I don't think Porsche sells the clutch and bearing separately from the compressor, but you may find it in the after market. The pulley still spins freely, so I assume this means that the bearing that would be part of the clutch assembly must still be fine. I cannot get the compressor shaft to rotate. So, apparently the compressor seized, while the clutch was engaged, and instead of the belt slipping, the pulley+clutch unit tore loose the rubber isolator built into the pressure plate hub (the melted rubber in the picture above). The pressure plate hub attaches to the splined shaft of the compressor, and the electromagnet couples the pressure plate hub to the spinning belt driven pulley. So I think I can still drive the car safely with the clutch pressure plate removed, just no AC. Need to figure out why the compressor seized, but bottom line is that I need a new compressor+clutch unit. Just be aware that if an internal bearing on the compressor has gone bad, it has probably also filled the entire system with debris, which will need to be completely flushed out before the system can be closed up and recharged, otherwise any residual debris will kill the new compressor. Probably also be a good idea to toss the dryer and install a new one as you will never get that clean of debris.
  14. JFP in PA
    Yet another example of why not to buy cheap or poorly made tools...............
  15. JFP in PA
    No diagnostic tool will tell you "exactly where the leak is", only that there is a leak, and the possible causes (see Loren's post above). It is up to the diagnostic technician to locate it by a process of elimination.
  16. JFP in PA
    The clutch assembly at the front of the compressor has a large bearing in it, which can seize. I don't think Porsche sells the clutch and bearing separately from the compressor, but you may find it in the after market.
  17. JFP in PA
    You should hear the fan, but it should not be overly loud. They can start to make noise when the electric motor is going south or if something has damaged the blades or stuck in them.
  18. JFP in PA
    The crank pulley should not "wobble".
  19. JFP in PA
    Not really, FTIR analysis is useful as a continuous "on-line" analytical tool for diesel engines in environments such as engine test cells where the engine is running and the FTIR is automatically collecting data. FTIR is not as accurate as either GC or FI techniques, but they are both very expensive and are also "batch" samples techniques (read you take a small sample of the oil and inject it into the instrument), which makes them difficult to automate for long run auto sampling testing.
  20. JFP in PA
    Thanks, but unfortunately, none of these address it issue of fuel dilution concentration accuracy between the two types of tests (flash point vs. GC or FI), which I have told is considerable; plus the fact that flash point analysis can be misinterpreted due to the impact of other factors on the oil which tend to give higher volatile's concentrations which are falsely attributed to increasing fuel dilution.
  21. JFP in PA
    If the 996 follows the lead of the early Boxsters and 18" wheels, the chassis will develop cracks at key suspension mount locations. Porsche's wheel and tire size limit recommendations only concerns normal street usage, so staying off the track is not going prevent the problem from starting, it just may take longer. Once the car starts to develop these failures, it is nearly impossible to hide and will totally kill the resale value of the car if spotted in a PPI. Any disturbance in the OEM paint, such as the use of sound deadening overspray's on these locations immediately raises questions and lowers prices, if the car is even saleable. At the end of the day, it is your car and your money, so proceed as you please; but the TSB exists for a reason............
  22. JFP in PA
    Loren, What makes the 19" wheel, "not approved for use on the 996 series cars"? Thanks, Offset and the fact that like the early Boxsters (which could not use 18" wheels), the chassis was not reinforced to handle the load of 19". Covered in Porsche TSB 18/04 4440.
  23. JFP in PA
    Your problem sounds more like a mount issue rather than a clutch problem. In order to check out the mounts, you are going to need to access and inspect them, looking for tears or deformation in the rubber isolation sections. Most commonly, they tear with age, causing symptoms like you are describing. Both the engine and transmission have mounts, and it would be a good idea to have a reference source on hand while doing the inspection, such as the Bentley 996 manual, which gives you both photos and diagrams to work from as well as "how to" information on removing and replacing any of the mounts.
  24. JFP in PA
    Orient Express is on the money, on your car the only information the PSE gets from the car is the ground speed to close the system and comply with European noise regs. No coding or activations are required to get the system to work.
  25. JFP in PA
    First of all, the A/S 3's are an all season tire; good all around, but not as crisp handling or responsive as a summer tire would be.
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