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450 SEL Correct Backpressure

Started by 90077merc, 30 July 2022, 11:33 PM

90077merc

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?
1974 450 SEL

rumb

'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS

Randys01

that sounds more like a possibility.

90077merc

1974 450 SEL

Randys01

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.

90077merc

Yes, the mechanic is saying it's the resonator that's probably plugged. Those are great ideas.
1974 450 SEL