955 idle uneven
04-19-2018, 05:53 PM
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955 idle uneven
hello friend
i have a problem with my pig
cayenne S, 2004r, 4,5 V8, m48.00
I have a problem with uneven/rough running cylinder on idle. Little rough on idle. No any codes in engine
On piwis I tested in various ways and found a problem.
In option "Uneven/rough running cylinder" my cylinder number 3 has a different value in than the rest of the cylinders. All cylinders have 0,5 or -1, my cylinder number 3 have value 3,58. Why ?
Low compression on this cylinder ? electrical problem ? All spark plugs and coils are new. I have this car for 4 years, there have always been idle vibrations, little vibrations, almost imperceptible, I have already driven 30,000 km with these symptoms..
i have a problem with my pig
cayenne S, 2004r, 4,5 V8, m48.00
I have a problem with uneven/rough running cylinder on idle. Little rough on idle. No any codes in engine
On piwis I tested in various ways and found a problem.
In option "Uneven/rough running cylinder" my cylinder number 3 has a different value in than the rest of the cylinders. All cylinders have 0,5 or -1, my cylinder number 3 have value 3,58. Why ?
Low compression on this cylinder ? electrical problem ? All spark plugs and coils are new. I have this car for 4 years, there have always been idle vibrations, little vibrations, almost imperceptible, I have already driven 30,000 km with these symptoms..
Last edited by dawdoo; 04-19-2018 at 07:26 PM.
04-19-2018, 06:48 PM
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Hi Dawdoo.. welcome to the Rennlist Cayenne forum.
I assume the numbers you are quoting are from the PIWIS? It should explain what those numbers mean.. if it's adaptation for a cylinder I'd first look at coil/plugs (which you've done), then compression. You didn't give us the year/model of your Cayenne, so all info passed on here should be considered wild-***-guesses (WAG..) And on some models - little vibrations can be a sign of failed engine upper strut support or engine mounts.
I assume the numbers you are quoting are from the PIWIS? It should explain what those numbers mean.. if it's adaptation for a cylinder I'd first look at coil/plugs (which you've done), then compression. You didn't give us the year/model of your Cayenne, so all info passed on here should be considered wild-***-guesses (WAG..) And on some models - little vibrations can be a sign of failed engine upper strut support or engine mounts.
04-19-2018, 07:26 PM
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oh sorry
cayenne S, 2004r, 4,5 V8, m48.00
Value on cylinder 3,58 is from piwis, from meansuring block name "uneven/rough running cylinder"
I have a new toruqe arm (black) and all coils and spark plugs
cayenne S, 2004r, 4,5 V8, m48.00
Value on cylinder 3,58 is from piwis, from meansuring block name "uneven/rough running cylinder"
I have a new toruqe arm (black) and all coils and spark plugs
04-20-2018, 11:32 AM
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Ok I will check the compression. Is it possible that the value is different by exhaust leakage ? When I stand on the right side of the car, I hear a quiet ps ps ps ps ps ps.
Cylinder number 3 is on the right side of the car, on the right head, maybe because of a leak in the exhaust system is the problem ?
look at video, turn up volume
Cylinder number 3 is on the right side of the car, on the right head, maybe because of a leak in the exhaust system is the problem ?
look at video, turn up volume
Last edited by dawdoo; 04-20-2018 at 12:57 PM.
04-20-2018, 01:03 PM
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Dawdoo - afraid I can't hear it in the video.. I hear a bit of injector noise, but can't hear a leak. Perhaps it's my ear-buds... I would imagine an exhaust leak could cause a slight idle problem...
Last edited by deilenberger; 11-22-2018 at 10:02 PM.
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04-20-2018, 01:35 PM
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original equip. Okay, first I have to check the compression.
Hmm, now I hear the second problem, whistling, howling in the background, you can hear it on the film
Hmm, now I hear the second problem, whistling, howling in the background, you can hear it on the film
11-22-2018, 06:42 PM
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mileage is 136k miles
compression in my cayenne is:
cylinders:
1-160psi
2-153psi
3-147psi
4-145psi
5-160psi
6-166psi
7-160psi
8-160psi
Corrections for camshaft position sensor is -7 and -13
Sometimes at low rpm on idle, feel slightly uneven work. Feel it in the driver's seat, gently vibrates. In addition, the engine runs quietly and evenly
I made a compression test from number: 8,7,6,5 and second side: 1,2,3,4.
photo: CLICK PHOTO
compression in my cayenne is:
cylinders:
1-160psi
2-153psi
3-147psi
4-145psi
5-160psi
6-166psi
7-160psi
8-160psi
Corrections for camshaft position sensor is -7 and -13
Sometimes at low rpm on idle, feel slightly uneven work. Feel it in the driver's seat, gently vibrates. In addition, the engine runs quietly and evenly
I made a compression test from number: 8,7,6,5 and second side: 1,2,3,4.
photo: CLICK PHOTO
Last edited by dawdoo; 11-22-2018 at 07:00 PM.
11-22-2018, 10:13 PM
#14
Cylinders 3 and 4 seem like they're a little on the low side for compression. But I'm not qualified to say if its a problem or not.
As far as the symptoms you're describing, I had the same and I just resolved them yesterday by finding and patching a vacuum leak.
As far as the symptoms you're describing, I had the same and I just resolved them yesterday by finding and patching a vacuum leak.
11-22-2018, 11:15 PM
#15
