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hills are a problem

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Old Jul 19, 2014 | 04:16 PM
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hills are a problem
last few months my 08 F250 has been slow going up hills. The fluid checks out ok and it shifts fine.

just seems to take forever to get up hills. Has 124K

also has a huge hissing noise thats RPM dependant on the passenger side. Will make the sound in neutral just revving.
 
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Old Jul 19, 2014 | 04:19 PM
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what kind of boost are you getting?
 
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Old Jul 19, 2014 | 07:27 PM
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its a gas V10 so no boost
 
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Old Jul 20, 2014 | 05:54 AM
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perhaps an exhaust leak.

Hopefully someone else will chime in that has the V10.
 
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Old Jul 20, 2014 | 06:36 AM
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It sounds like a cat going bad to me
 
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Old Jul 20, 2014 | 07:34 AM
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Could be a bad cat, but I've never heard of one of them hissing before. Are there any trouble codes?
 
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Old Jul 20, 2014 | 07:42 AM
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I lost a ton or power from my cats going bad in my 08 5.4. There were some problems with them. I got mine replaced under warranty but I believe it was $1200 for the y pipe or something outrageous like that
 
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Old Jul 20, 2014 | 08:06 AM
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While its probably been 20 years since I've last seen it, I have seen muffler baffles collapse and it acts just like that. Same for the pipes forward of the cat as they are usually double wall and the inner can break/crack and collapse..
 
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Old Jul 20, 2014 | 09:45 AM
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You need to post on the 6.8 V-10 thread. Give the year model.
 
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Old Jul 20, 2014 | 02:04 PM
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Originally Posted by Big-Foot
While its probably been 20 years since I've last seen it, I have seen muffler baffles collapse and it acts just like that. Same for the pipes forward of the cat as they are usually double wall and the inner can break/crack and collapse..
I had a 68 Cadillac in high school that turned in to a whistle, I scratched my head for a couple of days until I started cutting exhaust off it and found the collapsed inner pipe
 
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Old Aug 16, 2014 | 09:12 PM
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cats are plugged
 
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