Cayenne 3.2 2005 cold start misfire?
05-08-2014, 10:14 PM
#32
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Better yet, pull the line off and check for sludge inside. The sludge wont allow flow right when cold, then when it warms up will allow proper flow as it loosens. If there is any, try cleaning it out with brake cleaner, and let it dry before sticking it back on to fire it up.
05-09-2014, 02:29 AM
#33
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Better yet, pull the line off and check for sludge inside. The sludge wont allow flow right when cold, then when it warms up will allow proper flow as it loosens. If there is any, try cleaning it out with brake cleaner, and let it dry before sticking it back on to fire it up.
It doesn't misfire when I rev the engine. Only at idle.
Thanks for all your help
05-09-2014, 07:38 AM
#34
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The pcv valve is what regulates your crankcase pressure (as well as allowing moisture and blowby gases to leave the case and travel back into the intake to be burned for emissions) At idle there is low vacuum, and a low flow of air through it. At higher rpms, higher vacuum and more flow. If the valve isnt regulating the pressure from a bad valve , clogged line, or an air leak, the vacuum the engine needs will be lost, and the air mixture that the dme tries to calculate will be wrong (based on maf and the map sensors), and it will not compensate. It will simply run lean and not fully realize it. In essence, a bad or leaky valve will work the same as any other vacuum leak. As an example, go run your engine and pull off a vacuum line or the oil cap, it will start to run like crap (you might throw codes if you dont have a method of clearing them, beware).
Im pasting a pic of the eninge, the "disc" in the back corner is the valve , with a long line running on the side of the valve cover. I believe the part number should be 955 110 756 00
Im pasting a pic of the eninge, the "disc" in the back corner is the valve , with a long line running on the side of the valve cover. I believe the part number should be 955 110 756 00
05-12-2014, 01:56 PM
#35
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Small update. Since I can only check it when it's a cold start and been busy. Anyways. Don't see, hear, feel any leak around the pcv. No oil residue either. The misses are inconsistent. It's been really really short time frame lately. Cold start. Idle up. Idle drop. Pop pop pop and gone. Sometime it's like the 1st five mins. The popping is also erratic. It's like pop pop 3 sec pop pop pop 5sec pop...but not more than 3 pops that I've notice. Thanks.
06-17-2022, 08:14 AM
#38
http://youtu.be/ZeuIv_h-T5Q
Hi I'm new to the forum,
I recently bought a 2005 Porsche cayenne 3.2 v6 on a 2005 plate.
The vehicle has covered only 47000 miles or so, since December I've had a problem. When the vehicle is stone cold I.e. In a morning after been stationary for the night , the car starts no problem and revs higher during the cold start process at about 1k revs, when the vehicle drops down to .5 revs I can here the engine popping / banging like a mis fire, when I set off the vehicle has the same performance but sets off in 1st gear rather than the usual 2nd.
After perhaps 3/4 minutes of driving I do not get this problem again until I finish work 9 hours later.
If the car has been driven and is warm it never does it, it's literally when it's cold.
I took it too a German specialist who changed the oil, sparks and coils. The problem persists, we thought it could be the mad but after unplugging it and running the vehicle it still does the same without the maf.
Question is has anyone seen this before. I have no cel light, when plugged into diagnostics cat error code came up but only in cold. However appears it is not the cats.
Very frustrating and mystical! Any help appreciated
Hi I'm new to the forum,
I recently bought a 2005 Porsche cayenne 3.2 v6 on a 2005 plate.
The vehicle has covered only 47000 miles or so, since December I've had a problem. When the vehicle is stone cold I.e. In a morning after been stationary for the night , the car starts no problem and revs higher during the cold start process at about 1k revs, when the vehicle drops down to .5 revs I can here the engine popping / banging like a mis fire, when I set off the vehicle has the same performance but sets off in 1st gear rather than the usual 2nd.
After perhaps 3/4 minutes of driving I do not get this problem again until I finish work 9 hours later.
If the car has been driven and is warm it never does it, it's literally when it's cold.
I took it too a German specialist who changed the oil, sparks and coils. The problem persists, we thought it could be the mad but after unplugging it and running the vehicle it still does the same without the maf.
Question is has anyone seen this before. I have no cel light, when plugged into diagnostics cat error code came up but only in cold. However appears it is not the cats.
Very frustrating and mystical! Any help appreciated
I have the same issue but with the the newer 2015 model 958.2 (?) - were you able to understand what caused it?
