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Garage => Mechanicals => Topic started by: 90077merc on 30 July 2022, 11:33 PM

Title: 450 SEL Correct Backpressure
Post by: 90077merc on 30 July 2022, 11:33 PM
My mechanic said I needed a new exhaust resonator because even after replacing the fuel filter and fixing the distributor the car will not accelerate and has popping/backfire. My question is will the new resonator create the correct exhaust backpressure? What is the correct backpressure?
Title: Re: 450 SEL Correct Backpressure
Post by: rumb on 31 July 2022, 07:56 AM
Plugged cat convertor?
Title: Re: 450 SEL Correct Backpressure
Post by: Randys01 on 31 July 2022, 09:01 PM
that sounds more like a possibility.
Title: Re: 450 SEL Correct Backpressure
Post by: 90077merc on 31 July 2022, 11:48 PM
No cats on this car :)
Title: Re: 450 SEL Correct Backpressure
Post by: Randys01 on 01 August 2022, 03:25 AM
Is the mechanic suggesting the resonator rather than the muffler?...or both? By the way the standard accepted backpressure is about 1.5psi.

So does the thing sound gagged?......get someone to run the motor and  after a few good rev ups turn it off and see if the exhuast outlet continues to "Exhaust" . Tape a fine piece of paper to the outlet .if it continues to flutter after the engine is killed, I'd be suspicious of a blocked exhaust system.
Title: Re: 450 SEL Correct Backpressure
Post by: 90077merc on 01 August 2022, 12:18 PM
Yes, the mechanic is saying it's the resonator that's probably plugged. Those are great ideas.