Another Possible Stupid Question...
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Senior User
Joined: May 2012
Posts: 278
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From: Ball Ground Georgia
Another Possible Stupid Question...
Ok... Here goes. About a month or so ago, my muffler blew up and the truck has been running like crap ever since then. I haven't put in my fuel regulator yet because I'm waiting for the pluming parts from Jegs. Would having an open exhaust affect the timing? I just wanted to get it running so I can take it back to the garage that rebuilt the engine.
Any Suggestions/Comments?
For those that dont know... Its a 68 Ranger. 360 C6.
BTW: The truck ran great before the Exhaust blew... Well... It ran great until about 5 minutes before the exhaust blew...
Any Suggestions/Comments?
For those that dont know... Its a 68 Ranger. 360 C6.
BTW: The truck ran great before the Exhaust blew... Well... It ran great until about 5 minutes before the exhaust blew...
Senior User
Joined: Dec 2008
Posts: 485
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From: Fowlerville, Michigan
Open exhaust at your muffler (assuming it's a stock exhaust setup) shouldn't affect how the truck runs.
Is it the stock exhaust system or has it ever been replaced? I have heard that some exhaust systems of the day had double-walled pipes and the inner pipe, with nowhere to expand because of the outer, would kink up and collapse into the exhaust flow causing a huge restriction.
I'm not sure if Ford ever adopted the double-walled setup but perhaps it could explain why you blew up the muffler and it ran poorly since.
Is it the stock exhaust system or has it ever been replaced? I have heard that some exhaust systems of the day had double-walled pipes and the inner pipe, with nowhere to expand because of the outer, would kink up and collapse into the exhaust flow causing a huge restriction.
I'm not sure if Ford ever adopted the double-walled setup but perhaps it could explain why you blew up the muffler and it ran poorly since.
Laughing Gas
Joined: Aug 2011
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I've heard of situations like these too..it had to do with a massive backfire into the exhaust then the guy could never get his truck to run right. Eventually he had to disassemble the engine and I guess parts were pretty damaged.
FTE Legend
Joined: Sep 2003
Posts: 53,932
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From: NY and VA
As crazyeddie said, we ran across a lot of the collapsed pipes when I worked at a dealership. Late 60's early 70's.
If it was running great until about 5 minutes before the exhaust went I would suspect ignition problems. Raw fuel got into muffler then ignited.
If it was running great until about 5 minutes before the exhaust went I would suspect ignition problems. Raw fuel got into muffler then ignited.
Cargo Master
Joined: Apr 2009
Posts: 3,038
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From: South west Idaho
I'm thinking ignition problem first too,causing the blow out and not running right now , not the other way around.
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Hey cuz, There aint but one thing that will blow a muffler and it takes 2 ingredients, raw gas and spark. No need to look 1 mil. past that.
You can think on it and pull your hair out, but it will always come back to that.
John
You can think on it and pull your hair out, but it will always come back to that.
John
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Post Fiend
Joined: Jun 2003
Posts: 8,209
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From: Black Hills of SD
Ford dealers? I only ever ran into it on GM cars, Buicks and Caddys mostly and never after the muffler, always before. Pretty easy to tell if you put a vacuum gauge on.
Thread Starter
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Senior User
Joined: May 2012
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From: Ball Ground Georgia
Yep. I checked everything. The only thing I haven't done was to put the fuel regulator on. I will be doing this sometime this week.
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Senior User
Joined: May 2012
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From: Ball Ground Georgia
Thanks in advance...
Senior User
Joined: Dec 2008
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From: Fowlerville, Michigan
What carb do you have? Carbs should only see max 5-6psi fuel pressure. Much more than this and you have what I described above. The regulator (properly adjusted) should solve the problem.
willowbilly3, good point. Don't they usually go right after the manifolds/headers? Bad post on my part
FTE Legend
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From: NY and VA
Thread Starter
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Senior User
Joined: May 2012
Posts: 278
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From: Ball Ground Georgia
Why do you need a fuel regulator? Electric or HO mechanical pump? If so it's possible you are overpowering your carb's inlet valves, filling the float bowls entirely, and puking fuel down the intake through the bowl vents; which would explain the ignition in your muffler.
What carb do you have? Carbs should only see max 5-6psi fuel pressure. Much more than this and you have what I described above. The regulator (properly adjusted) should solve the problem.
willowbilly3, good point. Don't they usually go right after the manifolds/headers? Bad post on my part
What carb do you have? Carbs should only see max 5-6psi fuel pressure. Much more than this and you have what I described above. The regulator (properly adjusted) should solve the problem.
willowbilly3, good point. Don't they usually go right after the manifolds/headers? Bad post on my part
Senior User
Joined: Dec 2008
Posts: 485
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From: Fowlerville, Michigan
Holy crap! That thing could be pushing 20+ psi fuel pressure to the carb without a regulator!