CAT delete issue - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 06-10-2012, 04:02 AM Thread Starter
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CAT delete issue

Last week I deleted the CAT and replaced it with the MBRP 4" SS delete pipe. Yesterday when taking off from a stop light I had a poping sound from under the truck. My first thought was transmission because the truck jerked a little, but after hearing it a few times it seems to be the exhaust. Almost like a backfire. Any thoughts?

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post #2 of 13 Old 06-10-2012, 04:09 AM Thread Starter
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This happened under medium to heavy acceleration. Also, no smoke that I could see, and it didn't seem like an overboost.

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post #3 of 13 Old 06-10-2012, 04:22 AM
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I would see if anything is loose or bouncing against something

I made my Samsung SGH-I997 send this.



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post #4 of 13 Old 06-10-2012, 04:49 AM Thread Starter
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I just took it for a test drive, I can't identify what the issue is. It doesn't do it everytime, but I can feel the stumble in the peddle. I can already be doing 50mph before it starts. I let off the peddle a little bit and it stops most of the time. It never lasts very long.

I check the exhaust, everything seems tight.

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Last edited by ralderman; 06-10-2012 at 04:50 AM. Reason: added info
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post #5 of 13 Old 06-10-2012, 04:58 AM
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If it truly is a performance issue, maybe check your ebps and tube.
maybe it's leaking and had plenty of back pressure with the cat. Now it doesn't have a lot, which is good. But maybe the ebps is seeing little and is having issues?

I made my Samsung SGH-I997 send this.



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post #6 of 13 Old 06-10-2012, 06:36 AM Thread Starter
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It doesnt feel like a performance issue, the truck still pulls solid. My dad is sending my AutoEnginuity software back, I should have it in a few days. I'll check the sensor output. I may clean it after just to see if there is a difference.

I just checked my CCV reroute and has some slack in the supply line so I fixed that. It shouldn't make a difference, but just checking a few things on the truck. I also did a drain and refill on the transmission and changed the external filter. I did a flush and changed both filters about a year and half ago.

From reading about the EBP, it could be the cause, and does make sense. Anyone know what the sensor should read normally?


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post #7 of 13 Old 06-10-2012, 06:37 AM
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Check clearances around the pipe. It can be close to the crossmember or the body at times.
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post #8 of 13 Old 06-11-2012, 04:13 PM Thread Starter
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F250sixOh, great troubleshooting. I think that was part of my problem. The rear hanger was tapping the metal bracket next to the spare tire.

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post #9 of 13 Old 06-11-2012, 04:14 PM Thread Starter
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Now I have some type of intermittent grinding noise. I think it's in the front.

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post #10 of 13 Old 06-11-2012, 06:32 PM
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Quote:
Originally Posted by ralderman View Post
F250sixOh, great troubleshooting. I think that was part of my problem. The rear hanger was tapping the metal bracket next to the spare tire.
: ahem. I think I posted that first



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