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Hi Everyone, I am in the middle of doing the valve cover gaskets and have the passenger side off. In the middle of the valvecover there is a bolt that screwed into the head in guessing. Anyway, I took it out and pulled off the valve cover and it looks like theres something missing. All the other holes have brass fittings on them except one. I think its the one that had was bolting down the valvecover to the head. In the picture look at the middle of the head to the left. The brass fitting isnt there. Is this normal ? I am noticing it on other pictures kinda.
Hi Guys, Im in the middle of doing the valve cover gaskets. I started with the passenger side. When I took the cover off, there were these brass looking bolts with holes in the middle. cyl. 1-3 had them cyl. 4 was odd duck and did not have it. I looked on pelican and the picture of the valvetrain looked the same with the odd duck brass fitting. It doesnt look right. cyl 4 had a misfire. Im just wondering if any of you might have an hd picture of the passenger side, or even know what im talking about. The picture above shows the drivers side and all the brass fittings are missing. It looks like those, but only one. the rest have brass fittings. Please help. I have to have my car.
Where do you find an aftermarket diaphragm? I just looked on pelican and couldn't find it.
Thanks for responding Brett968! I was trying to get the cap for the crankcase vent yesterday, but I wasn't sure that the tabs were the only thing holding it on, so I wanted to wait to find out. I'll do that right now. The valve cover gaskets are definitely leaking. When I pulled the spark plugs one was full of oil leaking from the internal valve cover gasket? I am also worried that the intake is leaking too. I'll order the valve cover gasket and the diaphram as a preventative measure. Thanks!
Hi everybody, I have been following this forum for years, but never posted. Its funny (in a painful way) to read these posts. I guess it does make me feel better knowing others are having the same difficulty as myself. I, like others, have been fighting vacuum leaks going on 1 1/2 years. I have replaced the hose going to the booster, but the connection at the booster is crap. It sent me on a goose-chase looking for vacuum leaks which I did find some, but the main one in still the booster. Mine disguised itself by never throwing a code besides random misfire. Then, add a fuel pump problem, a coolant leak (2nd pump genuine), and a slipping 4th gear (sometimes) to really understand my pain. But I love the car. That's why I can't let it go. I must fix it and keep fixing it. It's painful! By the way I did use some gray Stuff IT gasket maker on the booster connection and she is starting to make a comeback again. By comeback I mean its almost running without missing. Almost:( Still sucks to see my baby like this. I know that it is a vacuum leak, but when I fix one I find another. 2004 Porsche Cayenne S 170000 miles. I still have code for o2 sensor bank 1 sensor 1, random misfire, and cylinder 4 misfire that I'll be diving into tomorrow by changing the 02 sensor and switching the tower on 4. The random misfire I believe is still a vacuum leak somewhere (or the **** booster still). I need a smoke machine! I saw several videos on youtube where they built one. Here's what I've replaced so far in this car: Rear driveshaft, front driveshaft, front differential, coolant tubes, fuel pumps, fuel filter, fuel regulator, rear hatch shocks, thermostat, water pump, front lower control arms, starter, manifold gaskets, spark plugs, plug towers, idler pully, engine stabilizer arm, radiator overflow, serpentine belt, all fluids many times, primary air pump, and brake booster vacuum line. As you can see ownership of this car makes you own the car literally. They wanted 8000$ to do the front differential, 3000$ for the coolant tubes, and $1300 for the starter at Porsche dealership, so that's when I started diving into the abyss I call fixing the cayenne fforrrreevverrrrr. Six years later, I'm starting to believe I could rebuild the car, but I don't want to Knock Knock. Peace brothas and happy driving (and fixing). If any of you have advise on my problem I would love to hear from you!!!
KenTHK, there absolutely is a connection with the vacuum at the brake booster and every power-train system. To test this, pull the vacuum hose off the booster while the engine is running. You'll see what I mean. The engine will severely misfire and run like crap. Of course if your engine is throwing codes for random misfire and running like total garbage, that is going to make shifting hard to compute for the computer. If your tranny doesn't shift right due to incorrect computer information then slamming, chattering, and such is expected. So yes, the vacuum in the brake system even though boosted with vacuum pump still originates from the engine and directly affects the performance of the entire drive-train system.