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Loren

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Posts posted by Loren

  1. The term "secondary air pump" is really referring to "secondary air" pump.

    The OBDII/DME provide the following (for US cars) - Oxygen sensing plus post catalyst sensing (4 sensors) 3-way catalytic converter system with one cascade catalyst both left + right (with two metal supports) secondary air system. Purely for exhaust system emissions monitoring.

    The DME performs a self-test each time you turn the key as do several other control systems within the car. Besides ODBII engine codes the car can also produce error codes for transmission problems (Tiptronic), PSM, and ABS.

    The secondary air turns on only when the sensors sense that it needs additional air to meet emission standards. So this is normally during warmup and occasionally after high speed driving and coming down to idle (like at a stop light).

    The secondary air pump is electric so it just turns on and off on demand. There is also a solenoid valve, air change-over valve, non-return valve and vacuum reservoir in that emissions circuit.

  2. Secondary air pump is probably related to the air pump to aid in it's process. I am not familiar with it, I will read about it and get back to you. [being redundant on Tool Pants last comment]

    The fan you hear in the morning is the fan which cools the oil cooler. I have never seen this fan for myself, but that is what I have read. The reason you hear it in the morning or anytime upon start up is because the vehicle is Posting [Power On Self Test].

    It is the computer [ECU] going through basic checks, in order to maintain the engine.

    Consider your Boxster an F-16 equivalent [stretching a bit], without a computer you don't fly, Boxsters fly, I know I do...  :lol:

    Not quite...

    The Secondary Air Pump IS the emissions pump. It's function is to improve emissions and to heat the three-way catalytic converter (TWC) faster, the secondary air injection pump is activated after the engine is started when cold, thus blowing secondary air behind the exhaust valves. If the engine temperature at start-up is less than -10 °C , the secondary air injection pump is disabled until the engine temperature has reached more than 44 °C . If the engine is started in a temperature range between -10 °C and 60 °C , the secondary air injection system is activated for a time depending on the start-up temperature. The secondary air injection system is deactivated under the following conditions:

    Engine load > 4.5 ms

    Air mass > 300 kg/h

    Engine speed > 3800 rpm

  3. My understanding is that the silver latches are no longer available - unless you can find a dealer that has some in old stock. Porsche started using electric switches instead in MY2001- on Carrera's. Some folks are spraying them with Wurth Silver Wheel paint then with Wurth Clear Coat Wheel paint. There is a DIY in my DIY section here.

  4. It also probably helped that I have taken the car there since it was bought (oil changes included) and they replaced the engine on the car a couple of years back.
    Hmm... perhaps the dealer should have read TSB 8/99 1940 Coolant Expansion Tank (dated 10-22-99) - "Concern: Replacing the coolant expansion tank when an engine is replaced" that instructs them to change the coolant tank to the newer version whenever an engine is replaced. They might have saved you this trouble.
  5. Does anyone know what devices (if any) would be wired through the relay carrier other than the Cab top and the PSE?  PCM Nav?  If so, wouldn't it make more sense to try pulling each non-grey/pink wire out of the carrier individually to see which one turns off the PSE behaviour? (or am I reading this wrong?)

    Thanks

    J

    That relay (996 618 980 03) is only for the PSE. That's why I said to try and remove two grey/pink wires.

  6. The grey/pink wire is the speedometer A signal. Depending on the options in your car it is routed to those optional devices. Every Porsche wiring harness is custom in that sense. You will want it disconnected from the PSE but not the other devices.

    If you just want the PSE to work ON/OFF (not based on speed) then you can safely remove the speedometer A wire from the PSE connection.

    You might try bypassing the PSE relay by removing the two grey/pink wires from the back of the relay carrier and joining them separately (not through the relay carrier).

  7. The link appears broken.  Where can I get shop manuals and what is a good price (an electronic version of the shop manusl would be awsome).

    The link is fixed. Porsche more than tripled the price of their paper manuals in January this year. The electronic version of manuals from Porsche is even more expensive. A one year subscription is $5,200.00. Updates would cost the same ($5,200) each year.

    Makes me glad I bought mine in 2000.

  8. The two most common issues are the switch on the clutch and the ignition switch. Porsche had some problems with ignition switches in the past. They introduced a new ignition switch in production builds as of September 05, 2003. Starting with VIN numbers:

    99 64S 62 0554 USA

    99 44S 63 5123 USA

    99 74S 65 0736 USA

    99 74S 69 2289 USA

    Either way this should still be covered by your warranty.

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