Engine palpitating at idle (thumping sound)

MartyMcFLy said:

I have a 2001 Suburban 2500 with the 6.0L. It has 174k miles and drives fine, BUT I seem to notice a weird intermittent engine stuttering/palpitating sensation when idling. No check engine codes (I even hooked up the OBD2 to make sure).

It is strange, because it seems like it's skipping a beat every other second or so. I can feel the vibration in the steering wheel when it does. Do you think it's the spark plugs? The battery voltage seems to be fine. Starts right up and maintains voltage. Everything else seems healthy. What could it be?

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Doubeleive said:

I would hook up some kind of scanner and see if it shows anything, could be an dirty/sticky injector, wires, plugs, coil pack.
do you ever use any injector cleaner?

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PNW VietVet said:

Yea, would be nice to know that you use quality fuel and like was just recommended, run some injector cleaner thru it. Do you use just regular fuel in it? The higher grades have more additives and therefore do a better job of keeping injectors/fuel systems cleaner. How old are the spark plugs? Might also want to get the kit at an auto parts store and follow directions and clean the MAF. How old is the fuel filter?

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MartyMcFLy said:

I hooked up a scanner and no codes were thrown. I've never used injector cleaner.

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MartyMcFLy said:

I'm not sure how old the plugs are. I bought it last month and it seemed everything that I could check was good. I would have to take a plug out to get a look. I have no idea what the condition is on the fuel filter.

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