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Noises noises noises!

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Noises noises noises!

Post by Mn10 » Fri Jun 26, 2020 5:43 am

Hi all,

I just replaced my MAF sensor with a Bosch refurbished one and while the engine seems to respond better, I am now getting a noise from what seems like the rear of the exhaust. I’m puzzled as to what this could be. (Noise could’ve been there from before and I didn’t realize). The noise kind of sounds like a 2 stroke engine idling and it gets louder as I accelerate.
There’s also a hissing noise from the brake pedal when I press it down all the way. Weird thing is that there’s no noise in the other 90% of pedal activation. The noise is constant and ever since I installed the new sensor, it makes the idle erratic. Again though this is when you press it all the way, up to 90% activation there’s no noise or issues. (Not sure if broke booster or not)

If it helps, there were 3 check engine lights codes before I installed the new MAF sensor.

The double exhaust noise is what worries me.

Thank you.

My car is a 1994 Volvo 940 GLE

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Re: Noises noises noises!

Post by volvolugnut » Fri Jun 26, 2020 5:04 pm

Recent rust through on the muffler or other exhaust system?

2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

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Re: Noises noises noises!

Post by lummert » Sun Jun 28, 2020 6:13 pm

I'd certainly check out that possible vacuum leak caused by the brake booster when pressing the brake pedal.
1988 Volvo 760 Turbo Wagon

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