Exhaust leak and HP loss? - Defender Source
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  #1  
Old January 7th, 2014, 08:59 AM
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Exhaust leak and HP loss?

I have a pretty good exhaust leak from a loose muffler. Can tell from all the noise and backfiring. New thing today though, could barely get to 50 mph! Can usually cruise at 60-65. They truck seems to start struggling at 2200 rpm no matter what gear with a lot of sputtering from the exhaust. My question, can an exhaust leak cause a significant HP loss?
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  #2  
Old January 7th, 2014, 09:07 AM
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exhaust leak can lead to burnt valves which certainly leads to backfiring and power loss.
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Old January 7th, 2014, 09:15 AM
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What engine?
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Old January 7th, 2014, 09:24 AM
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An exhaust leak is just...a leak. Long term symptom: Noise.

You've got something else going on that is causing serious issues with your truck, and an exhaust leak is not one of them.
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Old January 7th, 2014, 09:44 AM
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Pretty sure his truck is a lc v8 that @ one time had a propane setup- possibly still does. I seem to remember he was looking for US adapters to refill it. Some engines run better with some back pressure. Depends on the engine and how major the leak is. If near the heads it is possible to run lean and burn an exhaust valve. Been there done that.
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Old January 7th, 2014, 09:56 AM
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Quote:
Originally Posted by Uncle Douglas View Post
Pretty sure his truck is a lc v8 that @ one time had a propane setup- possibly still does. I seem to remember he was looking for US adapters to refill it. Some engines run better with some back pressure. Dpends on the engine and how major the leak is. If near the heads it is possible to run lean and burn an exhaust valve. Been there done that.
Yes, it is a 3.5l v8 with propane, haven't run on propane in about a month though, only normal gas
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Old January 7th, 2014, 10:04 AM
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EFI, carb? I would suggest it best to start off by providing as much information as possible.

I would start looking at the basics. Fuel supply and spark.
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Old January 7th, 2014, 10:08 AM
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EFI, carb? I would suggest it best to start off by providing as much information as possible.

I would start looking at the basics. Fuel supply and spark.
Dual SU carbs
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Old January 7th, 2014, 10:57 AM
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do you have access to a compression tester ? Backfire could be several things, wiped cam, burnt valve, carb problem, or spark/timing.

Timing chains on these engines are known for stretching and throwing timing off as well.

Like John says best to start with basics, if you have fuel and spark my next check is compression.
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  #10  
Old January 7th, 2014, 11:03 AM
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Any chance you removed the spark plug wires and crossed two (inadvertently)? This can be a cause of your symptoms.
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Old January 7th, 2014, 11:06 AM
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I haven't done a thing to it except remove the muffler and reattach it a few weeks ago. I was going to install a flow master but realized it was the wrong diameter. So that's why I suspected exhaust...
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Old January 7th, 2014, 11:14 AM
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It is probably just a weird coincidence. Check the fuel filter and that you have a good flow of fuel. Have a close look over the whole ignition system for anything loose.

Have you been getting freezing? If so, try some gas line antifreeze. You could have water in the fuel filter.
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Old January 7th, 2014, 11:19 AM
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I had a problem like this and in the end Doug was right I had lost compression in a cylinder or 2
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