Intermittent rpm

[tommyboi87]

Just noticed this today. Heading home, while under light acceleration, my rpms would drop by 50-100rpm at a time per every 200 rpm or so I gained. Took off od and floored it, went from 3rd to 2nd, but didn't climb too good. Any time it goes from 2nd to 1st under hard acceleration it climbs good though. No lights or anything popping up, so I don't know what to do. Anybody have a similar issue?

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[tommyboi87]

I'm guessing cat or o2

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[MagSport]

I'm guessing cat or o2

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I'd say cat as well. Will it rev up alright?

 

[tommyboi87]

I revved it at the first light I had time to stop at, and hit about 4100 or so and acted like it was bouncing off the rev limiter, which it has done since I've owned the truck.

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[tommyboi87]

I'm giving it some time to cool off so I can go mess with it and see if I can hear anything in it.

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[MagSport]

Your engine should rev right to the rev limiter which is 5500. If not then I would think the cat as well. After it cools go out there and tap the cat and see if you hear a lot of noise.

 

[dapepper9]

Don't just tap, lightly wack with a rubber mallet after it's cooled. Should break up a bunch of clogging if you have it. Cheap fix to get you by until you can get a new cat or get new pipe in

 

[tommyboi87]

How do our trucks run straight piped?I don't have emissions here so I'm not worried about that for the meantime.

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[dapepper9]

They run fine just don't sound as good imo. Headers no cat no muffler single pipe that splits actually sounds pretty good i guess but loud AF

 

[tommyboi87]

Might be going to the parts store today.

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[Merc225hp]

pull the cat and put in a piece of pipe and call it good. Keep the **** in place.

 

[tommyboi87]

pull the cat and put in a piece of pipe and call it good. Keep the **** in place.

That's what I'm doing today. Well I shall attempt to do it today

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[dapepper9]

That's what I'm doing today. Well I shall attempt to do it today

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Is your cat 3"ID/2.5"OD? If it is, mind posting pics when you're done? I've been contemplating doing this myself.

 

[tommyboi87]

Sure thing bud. Didn't get to it like I wanted to today. My son has a cold and he had to be up my hind parts all day.

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[tommyboi87]

Plus my sawzall wouldn't hold a charge. I gotta go get a new battery for it.

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