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Author Topic: 88 tbi suburban running rough  (Read 11428 times)

Online VileZambonie

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Re: 88 tbi suburban running rough
« Reply #15 on: August 07, 2011, 10:55:35 am »
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Being as everything else on the suburban is original im assuming the o2 sensor was too so i replaced it. but it still runs a little rough but doesnt cut out near as much. Ive noticed now that it runs better when its cold than after its warmed up.

The ECM doesn't even look at the O2 sensor until it goes into closed loop so replacing the O2 sensor would not make it better when it's cold. Clear your codes and see what comes back. Go back to basics,

Tune up, make sure EGR is closed at idle, good fuel pressure, then see how it behaves. If it's still acting up you'll need to do some pinpoint tests.
« Last Edit: August 08, 2011, 08:15:00 pm by Captkaos »
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline greeneon_01

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Re: 88 tbi suburban running rough
« Reply #16 on: August 20, 2011, 04:55:18 pm »
sorry for the late response. figured out i had three fouled plugs that eventually ruined my o2 sensor. and i had a couple small vacuum leaks. all in all i dont see how it even ran lol. well it ran great for about a week. then started idling rough. it has a low idle and it lopes like it has a big cam in it. sometimes it almost dies out but has never died on me yet. ive noticed driving down the road just barely on the gas i can feel it lope and surge lightly. any ideas? it runs great otherwise. and no codes or cel at this time. im stumped.......
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