P1071 & p1074

Wednesday I swapped mufflers and had the bung for the wideband sensor welded in. Drove home and it sat till I drove to work Thursday. Was fine to and from work Thursday but around town running errands it threw an SES light. Drove home and didn't scan it. Got in Friday morning and the light was off, drove less than a mile to get some gas and the light came on so I swung back home and got the laptop and scanned it. Came up with P1071 and P1074. Cleared them and didt come back the rest of the drive, came back on after work and I cleared it again. Havent driven the truck or even started it today.

Any ideas?

P0174
p0171

Lean, left and right banks Travis. C'mon man. I can't see going from a Blowmaster to the little Magnaflow causing that much difference. But then again I looked at your scan that ya sent me way back and your IDC was over 100% then, so it could just be the straw that broke the camel's back. Get your Walbro in there and re-tune.

Quote:

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Originally Posted by Frenchy

Lean, left and right banks Travis. C'mon man. I can't see going from a Blowmaster to the little Magnaflow causing that much difference. But then again I looked at your scan that ya sent me way back and your IDC was over 100% then, so it could just be the straw that broke the camel's back. Get your Walbro in there and re-tune.

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I think that blowmaster was a HUGE restriction...it was a 2.5" in/out that I had when I was true dual that the exhaust shop chopped up to fit a 3" pipe. I compared the 3" in/out single chamber Mike sent me and one of the ones I took off...let's just say the case was significantly larger on the real 3" muffler.

Got the walbro here at the house but racetronix didn't send the little connector for the pump...so I either have to order that an overnight it or figure something else out.

Also got the wideband on it and off cold start at idle AFR was over 18.0...gauge stops at 18....at temp it was between 15.3-15.8. Cruise it was same. WOT was 12.5. That was just a brief hit tho so I'll get some more time with it here coming up.

:sigh: