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Reaction1
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Does anyone know how to remove the climate control unit out of a 2005 997? The temperature and fan speed levers are worn and look pretty bad. I want to remove the unit to strip and repaint them.
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It does not affect the idle; it only feels like it does. I had hooked up my Durametric diagnostic software and confirmed that the idle was not dipping during this shudder. Eventually, you'll feel it slightly when idling and you put it in Drive or go from Neutral to R or D, or put on you high beams, etc. Anytime the engine is under load you will feel this reverberations. It is in fact a resonating sound felt throughout the cabin due to the collapse of the hydro-mounts. It only happens under load and therefore appears to be affecting the RPMs, but it is not. Prior to replacing the mounts, I had methodically eliminated other possibities until I heard a mechanic say that they change a lot of Mercedes Benz hydro-mounts after customers complain that the vehicle isn't as quiet as before. It starts becoming noticeable after about 50,000 miles. In addition, I read that the old Porsche 928-S had hydro-mounts (and a V-8) and were known to have issues with these mounts. The independent mechanic that replaced the mounts on my Cayenne said that he had just replaced engine mounts on a fairly new Range Rover, also with the same type of mounts. The key is that thse mounts don't separate, as the traditional ones do, they just compress so that the engine is resting right up against the bracket with only a minimal amount of compressed rubber sandwiched in between. Diagnosing them is difficult and replacing them is a complicated job.
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The engine mounts were about $150 each and the transmission mount was bout $40. The labor is 12.5 hours because the engine and subframe have to be dropped. The independent shop I used charges $95 an hour and they did do a great job. It wound up costing me around $1300 total. Definitely the best investment I/ve made. My complaint was the shudder while comming to a complete stop, but I had not even noticed the constant hum and resonance in the cabin until I got the mounts replaced. Now its like whn it was new. From the moment you start it up, it is so smooth and quiet that you can't even tell the engine is running.
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Motor mounts. I just had mine replaced on 04 Cayenne S. No more idle shudder when coming to complete stop. Hydraulic mounts had settled 1 inch, without leaks. It's like having a new car. What a difference!!
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Engine Mounts!! Porsche dealers are clueless! I just had engine mounts replaced and the problem is solved. No more reverberation when coming to a complete stop. The hydraulic mounts settled about one inch, without leaking. Replace transmission mount while you're at it. It is complicated and should be done at a shop.
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Can someone provide instructions for replacing the hydraulic engine mounts on a V 8 Cayenne?
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Porsche tech said it feels like a bad engine mount, because the RPMs are not dipping. I have confirmed that with my Durametric software. He put it up on the lift and found a broken front differential mount. (There are 3) The torsion bar on one of the engine banks, which has rubber bushings on both ends, was also shot. I started out by replacing the torsion mount, but that did not resolve the problem. I am convinced we're on the right track, though. Does anyone have detailed instructions on how to replace the engine mounts? I might change those while I'm doing the front differential mounts.
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Someone suggested replacing the DME relay, as they sometimes get sticky or internal solder points can cause bad connections. Does anyone know where the DME relay is located on the 2004 Cayenne S? I have inspected all the grounds around the DME and around the battery and the frame, they all are solid and free of corrosion. My Durametric software indicates it is idling @ 580 RPM, is that the correct idle RPM under load?
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RFM, What is DME and can it affect idle in any way?
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I've cleaned the throttle body, which was fairly clean already. I had to use the Durametric software to reset it because it ran really rough after the cleaning. I still say that some sort of load is bringing the idle to dip just a bit below normal, and hence, the shudder.
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Thanks, RFM, Now we can rule out A/C as the possible culprit. I also disconnected the fuse to the fan motor and determined that it did not prevent the symptom, either. I wonder if perhaps a faulty solenoid switch or electronic valve in the transmission, which only activates during the last and slowest downshift , just prior to the Cayenne coming to a complete stop, might be the cause. It is definitely some sort of load applied, that in turn causes the RPMs to dip momentarily, causing a shudder to be felt. Any ideas from automatic transmission guys?
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I was able to isolate the problem. It will not do it with the A/C completely off. It is probably caused by some sort of electrical load. If idling and you turn A/C on, it will shudder, also. That's what made me try it without running the A/C. It is definitely something that wears out, because they only begin to do it after 50K miles or so. Maybe compressor clutch or electric fan motor gone bad. I have Duarmetric software and get no faults. Any ideas guys?
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My 2004 Cayenne S, with 75,000 mi on it also does this shudder. Has anybody successfully pinpointed the problem? What's the fix?
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lumpy cayenne v8
Reaction1 replied to paulmurph73's topic in 9PA, 9PA1 (Cayenne, Cayenne S, Cayenne Turbo, Cayenne Turbo S)
My 2004 Cayenne S was just not right since I've had it (17,000 mi). It lacked power to accelerate itself out of traffic. Despite the local dealer's claim to have replaced all 8 coils (twice) under warranty, I ordered 8 new coils (part number ending in 005) and installed them myself. To my dismay, I found that the dealer did not replace 2 of the coils on the right engine bank, although they charged Porsche for replacing all 8. Now, at 71,000, it finally runs like it is supposed to. This made the biggest difference. I wish I would have never trusted the dealer to do it right. I would have done it myself two years ago and been enjoying it all along! -
Replacing factory horn with compact air horn. The horn on a Porsche Cayenne is easy to access by removing a few screws securing the plastic wheel well cover. Using a 13mm wrench, remove horn. Keep the bolt, as you'll need to use it to install a 6" straight metal bracket (purchased at your local hardware store) to hang the new air horn. Install the metal bracket at about a 30 degree incline to keep the compact air horn from hitting the fog light on the inside of the bumper. You'll have to splice into the wiring harness (purple and brown wires) to power the new horn, because the factory harness has a plug that goes directly into the horn. If you cut off the plug, the wires are too short and inaccessible to splice into. Sounds great and louder!
