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Old 05-20-2019, 06:05 AM   #1
steelynorm
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Engine noise

So I recently acquired a 1989 325i coupe manual 215k
I also own a 1990 325i sedan manual 160k
Finally got my coupe!!!!
So after driving both back to back I started to realize something,the sound and engine noise north of the firewall are definitely more noticeable on my new 1989 coupe???
Of course I thought it was exhaust noise resonating in the cabin,it does not seem to be?
When I accelerate my 90 the noise from the rear of the car is what I notice most. The engine smoothly accelerates and u hear the muted Rpms go up and down
When I accelerate the 89 I can definitely hear more engine noise, mind you it is not some crazy straight pipe off the exhaust manifold noise but it is noticeable.

I opened the hood looked under the cars exhaust and manifolds while revving both, sounds different deeper tone maybe?

Insulation differences? Maybe?
I am concerned because I am not sure if coupe engine is on its last leg?
Thoughts?
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Old 05-20-2019, 06:38 AM   #2
sampayne
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It's hard to infer from what you described. Be more specific. Is the engine itself noisy, or does the exhaust sound louder? From the way you described it, sounds like it could potentially be an exhaust leak. If its the engine, check your valves, they probably need to be adjusted.
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Old 05-20-2019, 08:33 AM   #3
steelynorm
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Re:

Engine noise is louder in cabin.
It's almost like the firewall is more insulated.
When listening to engines with the hood up and revving engine
There is a difference in tone is slight
The difference of engine noise inside the car is more noticeable than outside the car.
I thought it could be an exhaust issue,is there away to check other than visual?
The rear exhaust is definitely louder.
But I don't think the sound is coming from that area, unless the reverberation of the muffler is moving towards front of car?
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Old 05-21-2019, 07:33 AM   #4
sampayne
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Does the coupe have a stock exhaust?
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Old 05-29-2019, 07:39 AM   #5
steelynorm
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Re

Went under car exhaust seems pretty ratty
Will replace cat and rest of exhaust and see if that helps
Noise
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