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xmac last won the day on November 29 2018

xmac had the most liked content!

About xmac

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  • From
    Silicon Valley, CA
  • Porsche Club
    PCA (Porsche Club of America)
  • Present cars
    1999 C4 XAA
    1997 Boxster 3.4
  • Future cars
  • Former cars
    1985 Jaguar XJ6 with a Chevy 350
    08 Subaru WRX
    94 Nissan Twin Turbo Z
    93 Nissan 300ZX
    87 VW Scirocco
    79 Regal Turbo
    72 GMC Sprint

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  1. Thanks for the tip. I just ordered a Robinair 75240
  2. The baffle maintains oil near the pickup so that there is no interruption, but the oil outside will still slosh. I have the LN add-on with the windage tray that is supposed to further help. From what I gather from Jeff, I bought a +2qt oil pan to run less oil on the track by underfilling. LOL Mac
  3. Thanks for the info and inputs. I am working on a revised graphic. Posting soon.
  4. I've had issues with oil ingestion issues on a track boxster with a 996 3.4 engine swap and an LN +2qt deep sump. The AOS was replaced with the real Porsche part but the white smoke problem continues. I contemplated AOS deletion over the motorsports version given there are many posts noting the super expensive motorsport version will fail as well and others that simply plugged the lines, noting it was purely emissions related. However, one post made me rethink when someone mentioned the AOS helps seal the low-tension piston rings used in M96 engines and that the mechanism is used to collect and reburn blow-by gases. I made a diagram to help me better understand why the engineers put in there in the first place and also figure out how oil actually gets sucked up. We know if it wasn't needed, Porsche would have removed it to save weight (like they do in every aspect of the car). Looking for validation that the diagram is correct and and changes edits needed. Thanks in advance.
  5. Answering my own question: In case someone needs it in the future, the shutoff valve needs to be connected to a switch 12V source on one end and the other into the DME pin 7 (yellow/brown) wire, not to ground as I had it. It appears there is ~-6V on the DME that reduces the voltage on the solenoid to a net of 6V (if a +12V source is used) and when the evap system pressure test happens, it adjusts the -6V to 0 so that the valve now sees a full 12V and actuates.
  6. I need help clearing two codes due to a 3.4 engine transplant in a 1997 986 I just purchased. I have two OBD codes P0447 and P0453 related to the the shutoff valve and fuel tank pressure sensor used in 1998+ cars. I found several other posts noting 1997's do not have wiring nor support the 1998+ fuel leak check hardware so I am taking the challenge to find alternatives to clear them for good. I have searched high and low and unable to find signal details the 1997 DME flashed with 99 996 3.4l map. Has anyone measured the voltage from pin 7 to ground on: 1997 DME remapped with 3.4l map (I measure a little over +6V for DME pin 7 to ground when nothing is connected) I thought I could easily clear the P0447 (open circuit) by simply connecting a 996-605-201-01 shutoff valve with a 12V source to pin 7 on the DME since both 97 and 98+ DME wiring diagrams show pin 7 as "AAV VALVE." However, after installing, P0447 goes away but code P0448 (short circuit) appears. The valve resistance is ~25.5 Ohm and toggles open and closed with a 9V battery so I don't think it is a bad valve. What is the pin 7 current or voltage signal the DME is expecting? Thanks!
  7. I had similar symptoms with a light but noticeable oil slick floating and yellow sludge in the coolant reservoir and then emulsion in the oil filler hose and cap. I replaced my air/oil separator (AOS) and after that, no emulsion and no oil slick anymore - and I check it regularly. Coolant runs through the head of the oil separator. Another location where coolant and oil run in close proximity is the heat exchanger adjacent to the starter. Some coolant/oil heat exchangers (all-metal) have been reported to fail too but less of a risk. I did not cut my AOS open to prove there was seepage, but I probably should have.
  8. Wow, O2 sensors - I hadn't even thought of that angle for possible issues. Thanks for passing that along Loren. Are the bung sizes are the same? I may roll the dice on the set of cats considering the price.
  9. Did several searches and could not find the answer if both the headers and cats can be swapped going from 3.6l to a 3.4l. For thread completeness, there several threads noting that you can put 3.6 mufflers on a 3.4, connecting to 3.4l cats. I use bypass pipes so mufflers are not part of my equation. My goal is to buy a used second set of catalytic converters to be modified with new 200 cell guts, but keep the stock parts just in case I want to revert back to fully stock in the future or have trouble at visual inspection. There seem to be more 2002+ exhaust parts available and came across a 2003 set but I have a '99. 1. Do 3.6l cats bolt onto 3.4 headers without any mods required (no need for 3.6l headers)? 2. If I replace both the headers and cats from a 3.6l onto my 3.4l, will they bolt right on and all brackets fit without any mods? 3. If I have to do a swap back to the original 3.4l cats with 3.6l headers on, would they fit on the headers, or would I have to put the original 3.4l headers back on to get them to fit? For reference, I pulled part numbers for both cats and headers: Catalytic Converters: 3.4l [M96.01/.02/.04] ('98-'99 / -'99 -> '00 -> '01-) 3.4l LEFT 996-113-021-53 / 996-113-021-56 -> 996-113-031-01 -> 996-113-031-02 3.4l RIGHT 996-113-022-53 / 996-113-022-56 -> 996-113-032-01 -> 996-113-032-02 3.6l [M96.03] (2002-2005) 3.6l LEFT 996-113-031-03 3.6l RIGHT 996-113-032-03 Exhaust Manifold/Headers: 3.4l [M96.01/.02/.04] ('98-'01) 3.4l LEFT (1998-2001) 3.4l RIGHT (1998-2001) 996-111-101-52 996-111-102-52 3.6l [M96.03] (2002-2005) 3.6l LEFT 3.6l RIGHT 996-111-101-53 996-111-102-53 X51 3.6l LEFT 3.6l RIGHT 996-111-101-40 996-111-102-40 edit: Simplified part # section and added color
  10. 1. Can you confirm the part number used is a 996.107.023.55? 2. Copied from the Pelican AOS Tech Article: "When the air-oil separator fails, the intake manifold vacuum will draw into the crankcase and the levels will reach 9-12 inches or more." 3. I would replace it with another new one since it is not worth saving the $150 for the problems it will create. At a minimum, I would take the new one out it out to test the non-coolant ports with a mityvac.
  11. 996 cable/wire sheathing seems to be tasty to critters. I had something eat through my knock sensor cable, but nothing a precision soldering iron can't fix. If you don't have the pinout, let me know and I can snap some pics for you. The connectors are brittle so be careful when taking them apart. Probably obvious, but also make sure you plug in black to black plug and gray to gray plug when putting them back together.
  12. I'm running a 295/30/18's on the 10" ET65 Sport Design wheels. They fill out the wheel nicely, no rubbing on a 99 C4. 295's are generally spec'ed for 10"-11" widths.
  13. While doing some other work, I noticed belt rub on a coolant line just above the lower left idler pulley. I have a '99 so I have the special TIS bracket/guide to help with belt slip but that goes in a different location. Anyone else seen this? All pulleys are in great shape with no slop. The belt is only about 1 year old made by ContiTech. Picture of the rubbing and one with the pulley removed.
  14. Had this happen to me. I used some needle-nose pliers and plastic o-ring pick to grab it then pull it up and over the lip. Take your time so you don't rip it.
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