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Everything posted by grover

  1. The car was well warmed up by that point, and had been a tick past 180 on the temp gauge for a solid 15 minutes. I have torque and a bluetooth OBDII and checked the O2 data on startup a few weeks ago- all looked normal; lean condition at startup turning to normal once the pump cut off. Which doesn't necessarily mean anything given the intermittent nature of the issue, but it at least confirms the impeller is still intact. Throwing an SAI code at a stoplight ~15 minutes after reaching normal operating temperature seems like an important clue and I'd like to puzzle out if it points to anything in particular. I don't want to go down a rabbit hole searching for vacuum leaks if the actual culprit is something completely different. So, this code popped at a stoplight on the way to an autocross Sunday morning. I cleared the code a few minutes later, autocrossed all day, drove home that evening, drove it some more the next day, parked for 2 hours, and drove home. No codes. Then it popped on this morning right after leaving my house for work this morning- P0491 & P0492 this time. (Sometimes it's just P0492. So far it's never been just P0491.)
  2. That's what's puzzling. Why would it throw an SAI code 20 miles down the road at a stoplight? Does the DME think SAI inadvertantly turned on (intermittant vacuum leak, maybe)?
  3. I'm getting an intermittent secondary air injection CEL light. Sometimes it's P0492, sometimes P0491+P0492. But it's not consistent; I'll clear it and drive to work every day for a week with no issues, then it'll pop on again. And today I got a weird one: it threw P0492 while sitting at a light after driving 20 miles. Why would it do that? What does that mean? I've looked for problems in the SAI system, but the only thing I could find was a cracked connector on the venturi hose on the intake manifold by the AOS, though that's seemingly unrelated. Any thoughts? My first thought was a vacuum leak since they're so common, but the inconsistent codes (just bank 2 about half the time) and the code showing up long after start have me scratching me head. I can't find anyone reporting similar symptoms. Thoughts? 2004 Porsche Boxster S
  4. I used pipe clamps instead of porsche's style; tons easier to get into place and tighten and will be a lot easier to replace in the future if my AOS fails again.
  5. I run 245/35R18 in front and 285/30R18 rear with Kumho V710s (r-comp) with no issues. Clearance is REAL tight, though, especially in front on the inside. Also, I'm running aftermarket wheels, with slightly different offsets, which gives me an extra +4mm in front and -9mm in the rear. I don't think these tires would be an issue at stock offset, but different tires have different profiles, so it's really hard to say. I've heard of people running 285s all-around with Hooser A6 but found it actually was slower than 17s with 245s all-around. I DD and autocross Dunlop Z1 Star Specs and have nothing but great things to say about them; they've been discontinued and are on clearance now if you can still find them. Dunlop Z2 is supposed to be out in a few months and by the numbers, will blow away every summer tire presently on the market, so you might want to wait. Track alignment and GT3 sway bars should help you tune your understeer.
  6. Wow, that's just fantastic! I'd jump on that in a heartbeat if I could find one for $400 like you did. I'm fortunate enough to have access to lifts at a local auto hobby shop, but nothing beats that sort of access in your own garage. What sort of structural requirements does it have for installation?
  7. I'd read that in my Bentley manual as well, and was a bit unsure of how many quarts I needed to get. It's not really a "change" if it's only 1/3 of the fluid, is it? Does changing 3.5L meet the service requirements? Pelican Parts website recommended using Esso LT 71141 or Pentosin ATF-1 instead of Porsche fluid, but also said not to mix types. How do I know what's in there already? Can these both safely be mixed with original OEM fluid? '89k miles on my '04 986S and I know I'm due for an ATF change. Edit: hey, found a TSB here listing approved oils, and verified that both Esso LT 71141 and Pentosin ATF-1 are approved by Porsche for 986 ATF, and can be mixed.
  8. The throttle hunting/fluctuation was not fixed by cleaning the throttle body. What else may have caused this, what should I try next?
  9. The secondary air injection pump is part of the emissions system, and will always run when you first start the car, and will continue to run until the catalytic converters and O2 sensors are up to operating temperature. It's located on the top-front-right of the engine, right in front of the AOS. When you say "low whine", is it consistant with a fan you just weren't expecting to hear, or does it sound like it's failing? The good news is that if it fails, it's not going to impact the driveability of your car at all. The bad news is that it'll throw a CEL you won't be able to get rid out without fixing it.
  10. My steering creaking, most often in parking lots and such, and worse when the car is hot. Power steering fluid level is good, and the sound occurs even with the engine off. I think it's coming from the top of the front struts, and seems to go click-click-click when the wheel is turned very slowly with the engine off. Bad upper strut bearings? What's the danger of continueing to drive like this/is there a quick fix? When I replace them, do I need to replace the support ring, too?
  11. I cleaned my throttle body last night. Looked significantly different than Pedro's which I used as a guide- no idle control valve or any extra passages in the throttle body at all, just the butterfly valve and servo. Buildup looked superficial, but I went at it anyhow with foaming degreaser + elbow grease (elbow degrease?) + electronics cleaner and got nearly all of it off. One vacuum line came loose as I worked (from the AOS)- not sure if it was loose all along and causing my problems, but it's on good now. I drove around a bit at just above stall-speeds in 5th gear trying to replicate it; if it's still there, I couldn't tell. Time will tell, I suppose! Thanks again for the insight, Loren! :) Before: After:
  12. Idle is fine, though; the only issue seems to be in low-speed "overdrive" type conditions, whch has me a bit baffled.
  13. 2004 986S, tip, 84k miles. I've been having issues with throttle hunting/fluctuating at steady-state 25-45mph while going up light grades, and other places the engine is seeing high loads in low-rpm overdrive type situations where I've never had an issue before. No issues at idle or when driving aggressively- mostly in gears selected by the tip computer in auto mode in the 1500-3000rpm, and manually selecting one gear lower worked around it (no issues). No apparent drop in power, the throttle just seems to surge/fluctuate. Saw slight fluctuations in MAF obdII readings, but not sure if that's the cause or a symptom. No CEL codes. With no issues at idle, I'm thinking it's probably not a vacuum leak. I'm in the middle of a road trip (35mph speed limit on the Shenendoah parkway, grrr...) with limited tools available and a 6 hour drive home this weekend, but if it's something serious, I'll buy tools and get 'er fixed. First noticed the issue driving for lunch about 30 minutes after 8 back-to-back autocross runs, but it did not seem to impact performance at all the next day's autocross. Was hoping it was a fuel issue as I had gassed up at a really cheap station and put in 2 gallons twice to get to race levels (never sure how much 87 octane is already in the pipes before the 93 starts flowing...), but the issues persisted even after a full tank of 93 octane at a reputable station (Hess).
  14. If you mean the air bag light isn't lit when you're checking the lights, it's because the air bag is run by a different computer system. You need to remove the key, shut the door, and THEN open the door back up and put the key in start position- that should reset the system and it should light up now. (Unless it's actually out for real.) If I had a nickle for every time a state inspector tried to fail me for the airbag light out... I'd have a quarter. Really annoying that Porsche did this.
  15. Those are generic codes the computer will throw when it doesn't see the proper response from the O2 sensors for the ~30 seconds after you start the car when the secondary air injection is supposed to be running. If you're getting codes for both banks, it means it's affecting both sides, and thus likely something both sides have in common. I had a simple vacuum leak cause the codes (I'd knocked a line loose changing my AOS), but it could be an issue anywhere in the secondary air injection system.
  16. Flush out as much of that water-contaminated oil as you can get; the rest will boil off as steam when the engine reaches temperature. Just don't let it sit or you risk rust forming inside the engine.
  17. Secondary air injection exists exclusively to raise your catalytic converter temperature as quickly as possible to reduce emissions. When the cats and O2 sensors are up to the proper temperature, it turns off. You will get a CEL if it fails, but it's not going to impact the drivability of the car if it fails. Shoot, it it wasn't for the CEL, I'd have removed mine just to drop the dead weight. Boxsters don't directly measure much of the secondary air injection system; health is determined indirectly by O2 sensor data, which is accessible through OBDII. I've attached a plot of O2 sensor data starting my engine (3.2L) cold on a moderate day if anyone needs to compare with your readings.
  18. I just bought some 18" OZ Alleggerita HLT wheels for my '04 986S as track wheels, but really like the look. Gonna have to rethink which wheels get the race rubber!
  19. Thanks, Loren. I discovered the rotors are stamped "Min Th 26mm" too. I must have been looking at the wear limits for base 986 rotors.
  20. My state requires an annual inspection, and my '04 986S was just failed by the mechanic for below-spec front rotors. His sources say '97-2007 Boxster S front rotors must be replaced at 1.024" (26mm) and mine are at 1.010" and 1.002" (25.65 & 25.45mm). Quick web search shows those numbers look right for '05-07, but not my 04. I tried arguing with him, but he's sticking to his books. Is there an authoritative source on this, like an official Porsche manual I can reference? He's not going to take Pelican Parts or Bentley's word for it. Or am I mistaken and he's right and my rotors really do need to be replaced?
  21. Found it! I apparently knocked the vacuum line off the vacuum reservoir when I changed the AOS. Boneheaded, but at least easy and cheap to fix. Runs great now! :clapping: Thanks Loren, thanks Mike! Latest readings, presumed to be correct and how it's supposed to look for a 2004 Boxster S: Q. I understand the .45V readings are a fake value used for cold (not yet functioning) O2 sensors ignored by the ECU. But the other numbers would be actual readings. shouldn't the downstream O2 sensors (1-2/magenta and 2-2/cyan) always read leaner then the pre-cat O2 sensors?
  22. I logged the O2 data this morning - pretty clear from the 30-odd seconds of very rich exhaust when it should be very lean that the problem is somewhere in the secondary air injection. I don't have a durametric; is there a PID I can use with my OBDII scantool to remotely activate the vacuum switch for testing? I found this awesomely detailed checklist for troubleshooting secondary air injection problems on Chevy S10 I plan on using as a troubleshooting guide, as the system components all appear to be identical, even if the actual parts are different. http://ww2.justanswe...23817_p0410.pdf Suspecting a vacuum leak, I checked my fuel trim as well; was between -10% and +10%, and very close to 0 most of the time. Is that enough to eliminate a vacuum leak as a potential cause, or could the leak be enough to foul up secondary air injection, but not enough to mess up the engine? It does seem to idle a bit rough, but smooth out at higher rpms.
  23. Thanks Loren! After a little more digging, I was surprised to learn that's what pre-cat O2 data is supposed to look like; it's when they stop moving that you know there's an issue. I can hear the secondary air injection pump kick on and off, so that much is working. I'm hoping the O2 readings will tell me if there's a problem between the pump and the exhaust, or if it's elsewhere. I'm going to wait until the engine is fully cold and see if I can log some good data; I should see the pre-cat sensor should go full lean while the pump is running, then return to /\/\/\/\/\ after that, if it's all running properly. Anyone with a properly working 3.4L have any baseline data I can compare to?
  24. 2004 986S. I've been getting CEL P0491 & 492 ever since I replaced the AOS last July. I was hoping the problem was just some oil in the lines and it would go away, but it wouldn't. The P0032 code is new; this is the first time I've seen this code, but this was the first time I've been able to check my engine actually cold, the other times have been after driving to the auto parts store to borrow their scanner. CEL codes: P0491 Secondary Air Injection System (bank 1) P0492 Secondary Air Injection System (bank 2) P0032 HO2S Heater Control Circuit High (Bank 1 Sensor 1) Quoth Bentley: "The secondary air system is monitoring using the precatalyst oxygen sensors. Once the air pump is active and air is injected into the system, the signal at the oxygen sensor reflects a lean condition. If the oxygen sensor signal does not change, a fault is set identifying the fault bank(s). If after completing the next cold start a fault is again present, the MIL illuminates." I put together a screen showing graphs of all the O2 sensors. The first snapshot is right after I turned the car on (not entirely cold). The 2nd is after it was idling about 5 minutes. I don't know what O2 data is supposed to look like, but I'm pretty sure it's not this. Which sensor is bad. All of them? Also got these B codes. Not sure what they're about, but they're clearly unrelated. B1104 Audio [-] output #8 (TBD) circuit open B1200 Audio [-] output #18 (TBD) malfunction
  25. Edit: my bad, had a number transposed.
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