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  #1  
Old 07-15-2017, 09:20 AM
tbirdmike63 tbirdmike63 is offline
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Default Sputtering from one muffler

Hi, I have another question, I have the 428 motor, Dyno max mufflers original exhaust half way back, H pipe, I am getting a sputtering sound coming from the driver's side muffler, passenger side sounds smooth and even, not the driver's side. The car has new exhaust manifold and gaskets on both sides. The exhaust that bends over the rear axle is not mendrel bent so the bends aren't smooth....at all. I thought the H pipe would prohibit this from happening. Thanks!
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  #2  
Old 07-15-2017, 10:47 AM
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Even with an H pipe the majority of exhaust coming out of the driver side muffler is from the driver side of the engine. Sputtering can be a number of things. Your carburetor has two mixture screws. One adjusts the passenger side and one the driver side. It's possible the driver side is not adjusted correctly. You may also have a misfire on that side caused by something else.

John
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Old 07-15-2017, 11:44 AM
Joe Johnston Joe Johnston is offline
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Do a compression check on all cylinders and report your findings.
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Old 07-15-2017, 06:46 PM
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Quote:
Originally Posted by jopizz View Post
Even with an H pipe the majority of exhaust coming out of the driver side muffler is from the driver side of the engine. Sputtering can be a number of things. Your carburetor has two mixture screws. One adjusts the passenger side and one the driver side. It's possible the driver side is not adjusted correctly. You may also have a misfire on that side caused by something else.

John
It's my belief the two sides of the carb 'serve' four cylinders each, one side of the carb does the front and rear cylinders on one side and the middle two cylinders on the the opposite side.
And the other side of the carb serves the remaining cylinders.

So I doubt an out of adjustment idle mixture would cause just one side of the motor to splutter.
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Old 07-15-2017, 08:55 PM
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Quote:
Originally Posted by scumdog View Post
It's my belief the two sides of the carb 'serve' four cylinders each, one side of the carb does the front and rear cylinders on one side and the middle two cylinders on the the opposite side.
And the other side of the carb serves the remaining cylinders.

So I doubt an out of adjustment idle mixture would cause just one side of the motor to splutter.
If you don't think so turn one of your mixture screws and see how the exhaust sound on one side changes compared to the other side. There's certainly some crossover in the intake and having an H pipe rather than two separate pipes makes it more difficult to troubleshoot but from experience adjusting one side and listening to the exhaust sound is how we learned to fine tune the carburetor when we didn't have a vacuum gauge handy. You are correct in that it's not cut and dry as far as which side but that's where I would start.

John
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Last edited by jopizz : 07-15-2017 at 09:27 PM.
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Old 07-15-2017, 11:56 PM
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I like ALL these suggestions. I tend to suspect mechanical faults so Joe's suggestion would reveal a bad valve.

John and Tom's suggestions are probably the correct and cheapest things to check first.

There is another possibility and that is a vacuum leak, which leans the air-to-fuel ratio in the leaky cylinder. So, a vacuum check might help as well. Then, turn on an in-lit propane torch and slowly wave it around the intake gaskets. I would do this outside. If your engine speed increases, you found the leak.

If all this checks out, pull your valve cover off of the faulty cylinder and watch the pushrods and rocker arms as they cycle. You may find one that isn't right. - Dave
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Old 07-16-2017, 12:25 AM
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This is a case where audio is worth a thousand words. A burnt valve will have a distinctive sound different from many other exhaust noises. If it has a rhythmic sound like a choo-choo train then it's most likely a burnt valve.

John
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Old 07-16-2017, 03:39 AM
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Quote:
Originally Posted by jopizz View Post
This is a case where audio is worth a thousand words. A burnt valve will have a distinctive sound different from many other exhaust noises. If it has a rhythmic sound like a choo-choo train then it's most likely a burnt valve.

John
That depends on which valve is burned. Exhaust valves commonly burn but I've seen intake valves that burned as well. You probably have too. - Dave
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Old 07-16-2017, 02:48 PM
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Have the obvious like a bad spark-plug or disconnected plug lead or even crossed leads been checked?
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