Xoutpost.com - View Single Post - Engine Acceleration reduces with a mild hissing sound from engine bay

Henn28 · #8 12-09-2022, 10:26 PM

Definitely need to check the codes and live data looking for anomalies. The sound you are hearing (hisssing) doesn’t match anything similar from my 4.6 motor, but I will say the power from my engine comes on with a very noticeable “bang” around 3500 rpm. It pulls strongly before that, but really rips at and above that approximate rpm. So the hissss and power surge may be somewhat unrelated. I do have a mild tune running on my car, but other 4.6 owners tell me theirs is biased to higher rpm.p too.

Have you done a detailed visual check of the vacuum and intake plumbing? I was having odd issues with my e53 early in its new life (2002) which turned out to be the intake boot which had (very) partially slipped off the throttle. The cars are also very particular about the vacuum plumbing integrity it seems.

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