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      02-14-2021, 07:33 PM   #1
SanfordZ4
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Need Help: Ticking/Pulsing Noise 2015 Z4

All,
I am trying to troubleshoot noise (sort of ticking/pulsing/coin rattling). Started after dealer replaced the heat exchanger valve. It seems to occur during cold days and at idle/low speed.
here is the link of the video, taped it while driving. have setup some timestamps:



noise start - noise stop.
0:06 - 0:08
0:11-0:19
0:22 - 0:33
0:37-0:40
0:43 - 0:45
0:51-0:55 (changes frequency and sounds like a big rig right next to you at stop light.

thanks in advance
Sanjay
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      02-15-2021, 04:16 AM   #2
bigendbob
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Does it vary with the heater fan speed. I sometimes at certain fan speeds get the sound of a cricket in the heater, at low settings. Sounds similar to you video.
Problem is in a small cabin, sounds tend to emanate opposite to the culprit.
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      02-15-2021, 08:08 PM   #3
SanfordZ4
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I did not pay attention to the heater setting. I will check it out. it certainly has something to do with heat/cold. also the noise turns on/off as i press the gas pedal.
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      02-21-2021, 07:22 AM   #4
SanfordZ4
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All, just wanted to share the solution: Seems like the issue is related to High Pressure Fuel Pump. We changed the pump ~$1500. Fortunately i had extended warranty.
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