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DK570 replied to Cameron Tam's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)I solved my codes by pretty much replacing all the SAI vacuum lines. Take a look at the thread here:
DK570 replied to rockhouse66's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)I think it should if I remember correctly. My key no longer operates the top. Everything else on my key and top work, so I haven't even tried to troubleshoot it.
I think it's 4320501
The angle looking at changeover valve #2 is just right so you can't really see one of the elbows. Circled in Blue below: It's a little confusing ordering the parts since the diagram that Porsche uses shows the old style shut off valve from 1999 which has a bit different plumbing.
I replaced everything seen in your pic: Except not the plenum or resonance flap actuator. Also, the dealer only gave me 1m of line, not 2m, so the 122mm bit is still original, but that's the easiest one to replace later. Also, I mis-counted the number of elbows needed, so the elbow to the one way check is original. Again easy to replace later. For anyone doing this in the future, you need 5 elbows, not 4. While I was in there, I replaced the starter. I also replaced a couple hose/line holders that I had broken previously when replacing the alternator last year (maybe 2 years ago).
Good news, it's been 3 days since I replaced everything, and no CEL. It seems to start quicker, and hold a more steady idle. Even better, I passed emissions today! Thanks for the help Ahsai!
After I took the starter out I was able to find enough room.
If it changes with revs, I doubt it's the SAI pump. However, while we are on the subject of SAI, I have codes p0491, and p0492 that reoccur. These are secondary air injection bank 1 and bank 2. I'm thinking about replacing every hose + the reservoir. Looks like you can access all of that if you remove the intake plenums? Any other ideas? It's strange in that I only get the codes when it's above freezing. I've been able to clear the codes, and not have them come back until the temp reaches about 34º on a few different occasions, so I don't think it's a coincidence. You only need to remove the alternator and the rear (rear of the car) intake plenum. Are you sure you only need to remove the alternator and rear plenum? I've gotten that far, but aren't sure what to do now.
I have an iphone. Maybe I'll look into the wireless adapter. I think my next step is to replace some components, as I'm thinking I have a vacuum leak. I've looked at your thread here:http://rennlist.com/forums/996-forum/849770-mkii-996-vacuum-line-routing-and-related-components.html which is quite helpful. My check valve does of some oil mist on it, so maybe it's gone bad, but that could be a coincidence. I'm having a bit of trouble finding some of the components in the Porsche catalog though. I've found this diagram which shows some of it: http://sonnenporscheoemparts.com/parts/2002/Porsche/911/Carrera%204/?siteid=215405&vehicleid=44889§ion=EMISSION%20SYSTEM But I can't find a diagram that shows the parts closer to the throttle body.
Yes, I notice it a lot on my way to work. I'll drive 20mi on the highway, than more often than not I'll get a red light at the end of my exit ramp and I'll hear it come on. Sometimes accompanied by a few seconds of a slightly lump idle. Driving home I usually get a few blocks of 30-40 mph after the highway before I hit a red light. I notice it less in this situation, compared to 20mi of 80mph immediately followed by a minute of 0 mph.
I did another log tonight, and it looks more like how I would expect it to. That first one may have been a fluke. When I clear the codes they usually come back in less than a week. (if the ambient temperature is warm enough). I've never not noticed the SAI pump running when cold. I cleared the codes yesterday, and drive about 50mi every day. We'll see how long until they come back & I'll try to pay attention to if the pump is running or not when cold. Copy of 2015_05_26_21_17_28.pdf
I really want to try and fix this problem now. I started the car, and recorded until the RPM dropped & the SAI shut off. I'm looking for opinions on what you see. To me, the O2 voltage ahead of cat bank 1 looks funky. Anyone agree or disagree? What should my next action be? Thanks! Copy of 2015_05_25_12_00_21.pdf
Just having the p0491 and p0492 codes does not make it run rough. It's only noticeable when at a stop light immediately after getting off the highway. The vacuum lines are connected to the manifold, which I think cause the slightly off idle after running at ~ 3000 rpm on the highway for a time period.
If it changes with revs, I doubt it's the SAI pump. However, while we are on the subject of SAI, I have codes p0491, and p0492 that reoccur. These are secondary air injection bank 1 and bank 2. I'm thinking about replacing every hose + the reservoir. Looks like you can access all of that if you remove the intake plenums? Any other ideas? It's strange in that I only get the codes when it's above freezing. I've been able to clear the codes, and not have them come back until the temp reaches about 34º on a few different occasions, so I don't think it's a coincidence.
This was the case. It's strange that on 3 of the lines, you simply push on to connect. For the 4th one, however, there are tabs that need to be pushed in after the hose is lid on to keep it sung.