Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

JFP in PA

Moderators
 View Profile  See their activity

  • Posts

    8,726

  • Joined

  • Last visited

  • Days Won

    198

 Content Type 

Everything posted by JFP in PA

  1. JFP in PA
    Durametric and PIWIS can both show that graphically as "Actual cam angle".
  2. JFP in PA
    Porblem with aftermarket reflashes is that you never know what the system is writing to the DME; if it wrote something extraneous to the cluster for example, which might not be over written or replaced during a factory reflash, leaving something to trip the checksum values. Over the years, we have seen many horror stories about this kind of thing which sometimes ended up replacing the DME, which is an extremely expensive proposition.
  3. JFP in PA
    Two points; yes, if something was wrong the car should code. Second, if the Vario Cam is not functioning, the car is giving up a lot of performance. And while some have called the Durametric system "glitchy", it is still the best tool out there short of a PIWIS system, and if it says the cams are not switching position with RPM's, I would tend to believe it.
  4. JFP in PA
    Porsche, and a lot of states that check, use a simple "check sum" procedure to verify if a computer has altered software; any modifications as simple as changing the ignition timing would alter that summation value, even if those modifications were disabled, failing the car. Unfortunately, I really don't know how to circumvent this problem.
  5. JFP in PA
    AGM's tend to be longer lived and more forgiving than flooded cell batteries.
  6. JFP in PA
    NONE, ZERO, NADA; THEY ARE INSTALLED CLEAN AND DRY................... If you sealed or glued in the green plugs, they wouldn't act as safety's and pop out when the sump went under pressure, then either your front or rear main seal would pop out instead. And while I don't know about you, I'd much rather have to replace the green plugs rather than the main crank seals, but that's just my preference..................😉
  7. JFP in PA
    Hard to say, as I have never tried it. But even if nothing unexpected mechanically happens, the car will be running way below its potential as the Vario Cam adds significant performance to the engine; so, running it this way is much like a boxer stepping into the ring with one hand tied behind their back. Personally, I see no real reason to even attempt it as I cannot see what you are going to learn from the experience......
  8. JFP in PA
    Common phenomenon.
  9. JFP in PA
    ALL aftermarket AOS units are garbage, period. We have never seen one that was any good.
  10. JFP in PA
    Welcome to RennTech Cam deviation is the difference from ideal between the crank position and the cams relative positions. The specs for these engines are +/- 6 degrees. Excessive "slop" in this system can come from multiple sources: The chains, the wear pads (particularly the small ones on the five chain engines), and the hydraulic tensioners, all of which are subject to wear/stretching. Unfortunately, it is often very difficult to isolate the specific component causing the problem, resulting in the replacement of everything.
  11. JFP in PA
    The four plugs are there for using cam holding tools when removing the cam covers, they form both an oil and vacuum seal. The AOS supplies a controlled vacuum source (`5 inches of water) that evacuates the oil sump, allowing the low-tension piston rings to proper seal; if the AOS fails, the sump can develop considerable pressure, which will pop out these plugs, which use a simple friction seal. And before you ask, you should NEVER use any type of sealant on them, they should just be inserted clean and dry as they are the "safety" to prevent the front and rear main crank seals from blowing out due to over pressure. And yes, if you blow one or more out, they will leak oil badly.
  12. JFP in PA
    Are you referring to the four half dollar sized green rubber plugs? If they blew out, you have a pressurized oil sump........
  13. JFP in PA
    Clean the engine off and watch to see where it is coming from; possibilities are almost endless................
  14. JFP in PA
    You will find the front end control unit in the front trunk - right side - near the back of the right front headlight. You will likely have to have that control unit re-programmed by a dealer/OPC
  15. JFP in PA
    Durametric Pro can also read if it is set to active or activate it if it isn't.
  16. JFP in PA
    What I would be looking for is the fuel pressure at idle, and after sitting for a bit, recheck the sitting pressure, plus the delivery rate. Fuel pressure and delivery rates are tested by connecting an appropriate gauge to the port (items #6-7 in the diagram) on the fuel rail. Engine off pressure 3.8 +/- 0.2 bar; engine idling 3.3 +/- 0.2 bar. A second critical fuel system test for these cars is delivery, or how much fuel volume is the pump putting out. In 30 seconds, your pump should deliver at least 850 cc of fuel.
  17. JFP in PA
    Have done the fuel system tests yet?
  18. JFP in PA
    I would correct the vent senor wire and put it back together and see if the noise is gone.
  19. JFP in PA
    It should not be hissing.
  20. JFP in PA
    P1124 and 1126 indicate that the intake mixture is so lean the DME cannot compensate. The hissing sound you hear is a vacuum leak, probably in the EVAP systen that is causing the lean condition, or the fuel system pressure bleeding off at the pump doing the same thing. Time to test fuel pressure and delivery rates, if they are good, you are back to a vacuum leak.
  21. JFP in PA
    P1397 Camshaft Position Sensor 2 - Signal Implausible, Short to Ground, Short to B+ Potential causes: - No power supply. - Short circuit to B+ - Short circuit to ground. - CMP sensor faulty Check the wiring...
  22. JFP in PA
    I have to agree with Loren's comments on the 97 cars having more than their share of O2 sensor issue, probably as the result of the first DME version. That said, he is also correct in trying to replace sections of the car's main wiring harness, it is a bear of a job and not without its own related problems. If the electrical diagnostics I suggested are outside your capabilities, it may be time to take the car to a qualified independent shop for them to run the diagnostics, which takes a lot less time than replacing the harness. In all the years I have been working on these cars, very few times was a partial harness replacement actually required, and then only as the outcome of an onboard fire. Most harness issues are repairable.
  23. JFP in PA
    FWIW Pelican often offers incorrect advice along with their outrageous pricing and bogus substitute products.............
  24. JFP in PA
    Welcome to RennTech When was the last time you flushed the clutch hydraulic system? Creeping forward says that the clutch is not releasing, so it is either the hydraulic system or you need a new clutch.................
  25. JFP in PA
    You can probably discern this type of information from either the PET system, or even a dealer's online parts system breakdown drawings.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.