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About txhokie4life

  • Rank
    Contributing Member
  • Birthday 02/19/1966

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  • From
  • Porsche Club
    PCA (Porsche Club of America)
  • Present cars
    08 Cayenne Twin Turbo Daily Driver/Tow Vehicle
    00 Boxster S Street/Track Car
    82 928 Euro S
    86 951 Track Car
    75 911 RSR Race Car
    88 924S Race Car, 86 944 Race Car
  • Future cars
    Porsche 911
  • Former cars
    Maserati Bi-Turbo
    Nissan 300ZX TT
    Nissan 350Z Roadster

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  1. txhokie4life

    Dme reprogram 986

    specialized ecu repair mike
  2. txhokie4life

    Starting issue, cranks won't start

    What signals at the DME are required for the dme to engage the fuel pump? pin 66 on my spec boxster is not pulling to gnd. My dme/immob/key have been tested and are good. mike
  3. txhokie4life

    Noise after starting?

    That's your starter. It's not disengaging from the flywheel on its own. Not sure if you can access it easy enough and spray a little lubrication on it. Mike
  4. txhokie4life

    Crank but no fire

    Pin 66 is =12v, so it’s not happy Pin 63 remains at 12v, not happy either. The dme was tested fine, and was programmed/modified to ignore the immob. mike
  5. txhokie4life

    Cam Steel Expansion Plug Blew

    Too much sealant blocking the oil passage. take the cover off, remove the sealant reseal with less sealant and you should be fine. Use new green plugs mike
  6. txhokie4life

    Crank but no fire

    Not sure the car still has the SRS (since it's a spec boxter) --- I'll need to drag the Durametric back out and see what I can talk to -- I did at one point, but I've forgotten. Looking at the schematics -- clutch interlock could come into play as well -- even though the car has been converted to push to start and starter is not controlled by DME. Will have to check that as well
  7. txhokie4life

    Crank but no fire

    Borrowed the o-scope. Looks like ~8v p-p yep missing tooth looks right and decent crank speed. i haven’t been able to verify no spark ... but I’ve got no fuel injector firing I was thinking along the lines if not SRS, maybe crash sensor. Roll over sensor, or something like that. i’m running out of ideas.... Need to crawl through schematics some more. i guess my only saving grace to my pride is this is proving to be a royal pita and has many folks stunped mike
  8. txhokie4life

    Crank but no fire

    Back at it again tonite no tach bounce, no fuel injector firing (mood light) hooked up scope to CPS at dme i get life. going to noodle on that and game plan for this weekend. one possibility is how does airbag system normally talk to ecu? im 99% sure this has been deleted and circumvented... maybe something there has come loose? mike
  9. txhokie4life

    Crank but no fire

    Definitely not the case -- will have to figure out why -- I did replace it -- maybe the new one is bad too (unlikely but possible), or there was some issue with the connector/line/etc. Mike
  10. txhokie4life

    Crank but no fire

    Sorry for being offline -- I had several beach homes in the line of fire of Hurricane Michael -- so I have been a bit preoccupied. I did get the DME sent off and tested -- and its fine -- for good measure -- I had the immobilizer delete performed (it wasn't cheap -- but its a race car and I wanted to in theory reduce the source of other potential issues). I didn't get a chance to check pin 66 before I shipped it off. I did put the DME back in post modification -- no joy. No fuel pressure, and when I do do the fuel pump bypass, I get fuel pressure, but no start. I'm headed back out tonite to continue debugging. While I replaced the CPS -- I have not seen tach bounce while trying to start. I don't know how subtle the bounce would be -- on my old 944, it was fairly obvious. I'm tempted to try yet another CPS, they're not THAT hard to swap out. This is where I wish I had not sold my Boxster S -- I could pull the fuel pump relay -- and see just how much the tach bounced. Mike
  11. txhokie4life

    Crank but no fire

    The StartLock relay is hardwired to VSS. I might have to figure out if I can tap into the loom to observe the exact signal.
  12. txhokie4life

    Crank but no fire

    I still haven't found a car with coil on plug that I can access to test on. So I'm not sure, but I don't think so. I do note that if the pump even came on for a second -- it would pressurize the gauge and it would hold for awhile -- and this is not happening. Wish I could querry the DME and have it tell me what it thinks is going on. Mike
  13. txhokie4life

    Crank but no fire

    When should fuel pump relay be running? keon, engine off as well as during starting or only if CPS gives signal? i was thinking its fuel injectors and spark controlled by cps (indirectly) Btw, I’ve replaced cps thx, mike
  14. txhokie4life

    Crank but no fire

    Read the tea leaves wrong -- got a fuel pressure gauge on the car this morning. No fuel pressure KEON or during Cranking. I have a fuel bypass switch to empty the fuel tank. With that switch i get nearly 4 bar. So the fuel pump is good. I was getting 12v on 30, 85, and 86 with 87 as 0v on the fuel pump relay. But I was reading that incorrectly when I said things were good. With the switch, I get ~12v on pin 87, and the fuel pump runs. I ran out of time -- but now I need to go back and revisit some assumptions and revert back to the original DME and recollect some data. Mike
  15. txhokie4life

    Crank but no fire

    All voltages on MFI/Start Lock/Ignition/Fuel Pump relays seem to make sense. I also double checked all fuses, both in the kick panel and the main current distribution box. Next is to check Fuel Pressure -- I didn't have the right connector for the kit I bought (murphy's law). Will also check all crimped supply connections for a potential loose wire. Didn't notice anything from before. I have not swapped ignition switch yet. But as I have assembled and disassembled over the debug, the starting even while jumping was getting worse, and not will not start at all -- but the car still cranks fine. Mike

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