o2 sensor question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Boog** · 09-16-2011, 06:54 PM

You said
"It sets off the sensor after I've been driving for awhile, but as soon as I decelerate, it goes off. Makes the truck run a little rough at start-up, but other than that, it doesn't cause any problems."

Confusing. SES comes on after you've been driving a while but goes out when you decelerate and makes the truck run rough at start up?

Have you pulled the stored codes from it?
You may have a couple of different problems here.
Rough running on startup can be the coolant temp sensor. Cheap fix. The other can be egr related but really need to read the stored codes in it.
Are the front two 02 sensors in place?

09-16-2011, 06:54 PM	#16
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 14,116	Re: o2 sensor question You said "It sets off the sensor after I've been driving for awhile, but as soon as I decelerate, it goes off. Makes the truck run a little rough at start-up, but other than that, it doesn't cause any problems." Confusing. SES comes on after you've been driving a while but goes out when you decelerate and makes the truck run rough at start up? Have you pulled the stored codes from it? You may have a couple of different problems here. Rough running on startup can be the coolant temp sensor. Cheap fix. The other can be egr related but really need to read the stored codes in it. Are the front two 02 sensors in place? __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver 'primer is finer' Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross



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