958.2 Cayenne S Vacuum pump location? Is cruise control vacuum driven?
#1
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Hi all,
Chasing down a p1476 code which is "leak detection pump insufficient vacuu." Code persisted despite changing the leak detection pump. Code comes and goes.
My questions are as follows:
1. Is the cruise control vacuum driven? I notice sometimes drops a few mph when going up incline. May gove me a clue this may be a central vacuum problem.
2. Where is vacuum pump located on the 958.2 CAYENNE s?
I cant find any info anywhere and alldata does not support this model. Any help would be appreciated.
Chasing down a p1476 code which is "leak detection pump insufficient vacuu." Code persisted despite changing the leak detection pump. Code comes and goes.
My questions are as follows:
1. Is the cruise control vacuum driven? I notice sometimes drops a few mph when going up incline. May gove me a clue this may be a central vacuum problem.
2. Where is vacuum pump located on the 958.2 CAYENNE s?
I cant find any info anywhere and alldata does not support this model. Any help would be appreciated.
#2
Rennlist Member
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Is that the V8 in that model? If it is then the vacuum pump should be on the passenger side rear head
Last edited by RAudi Driver; 02-15-2024 at 03:09 PM.
#5
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My plan is to smoke test the vacuum inlet line off of the LDP and also test it with a vacuum gauge. Just wanted to see if anyone knew if the cruise control on these cars is vacuum driven, and also the location of the vacuum pump so i can smoke/check those lines as well. Cheers.
#6
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My plan is to smoke test the vacuum inlet line off of the LDP and also test it with a vacuum gauge. Just wanted to see if anyone knew if the cruise control on these cars is vacuum driven, and also the location of the vacuum pump so i can smoke/check those lines as well. Cheers.
https://www.porscheatlantaperimeterp...811005006.html
New V6: https://www.porscheatlantaperimeterp...ct=10064643#35
I believe our cruise control is electronic speed sensor driven,
Last edited by AnAlbumCover; 02-13-2024 at 04:01 PM.
#7
Rennlist Member
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Losing a few mph when in cruise control is a whole separate rabbit hole
Fortunately, it's a simple fix that just involves a firmware update at the dealer. Cost is one hour of labor.
Fortunately, it's a simple fix that just involves a firmware update at the dealer. Cost is one hour of labor.
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#9
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Want to bump this thread
I replaced LDP with porache OEM and I still get the code. It comes and goes.
I vacuum tested the line at the LDP and I get about 10 with large swings. I smoke tested all lines and don't have any leaks.
Wondering if the 10 of vacuum is normal? I feel like the large swings shouldnt be happening. I have no other vacuum related issues. Who thinks I should replace the vacuum pump?
#10
Rennlist Member
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Does your car have exhaust valves. Not engine exhaust valves but exhaust pipe exhaust valves. If so check the hose that goes to them.
#11
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I checked vacuum at the leak detection pump and it was bouncing around 10 erratically. I do not have exhaust valves. My next plan is to check vacuum right at the vacuum pump. I didn't know these could lose vacuum over time?
#12
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I just checkedchecked directly from the vacuum pump. The needle is bouncing around so much you can't even tell what number it's hovering over. Tried uploading a video but won't let. Absolutely sporadic needle. Went ahead and ordered a replacement vacuum pump. Let's see.