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O2 sensor causing surging?

Discussion in 'SVT Shelby GT500' started by 12boss302, Jan 13, 2018.

  1. 12boss302

    12boss302 Active Member Established Member

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    So I got my whole setup installed a little bit ago. I had a broken exhaust clamp during the tune but the tuner said it wasn’t much of an issue and tuned the car anyways. I made great power and enjoyed it even though I’m spinning my tires like crazy. Fast forward to the other day when I got a P2196 code. Figured it was an O2 so went to the local dealer and got two new ones and replaced them. This morning at cold start, the car started surging like no other. I am cammed but this was some heavy surging. Turned it off, and turned it back over and it was fine. Then it did it again this evening after sitting for about 2 hours. Not too cold here, but about 45-50. Question is this: would new o2 sensors cause this issue? Should I do connect the battery and do the whole reset thing? Swap sensors from left to right? Kinda puzzled here. I’m meeting my tuner on Monday to “clean up” the tune but was wondering if anyone ever ran into this problem. I got two other codes that he’s gonna work on due to the bypass valve not opening the way it should. Feels like it lags for 1/4 of a second before no I hit boost so maybe a TPS issue? Any help would be much appreciated.
     
  2. Catmonkey

    Catmonkey I Void Warranties! Premium Member Established Member

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    If it's doing this before the engine reaches operating temperature, I have had this issue. I'm cammed as well and on cold days, my car was extremely cold natured and would bog badly when I attempted to give it gas. This was 25* to 45* temperatures. I richened some of the cold start functions in the tune and lengthened the initial cold start high idle which made the car much more driveable when the mercury plummets. It doesn't hurt to let it sit and idle a bit longer than usual before you take off either.
     
  3. VNMOUS1

    VNMOUS1 Well-Known Member Established Member

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    What year is the car? (Seeing this on mobile so I can't see your info)





    [email protected]
     
  4. 12boss302

    12boss302 Active Member Established Member

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    2010
     
  5. GT500RedStripe

    GT500RedStripe More Power! Premium Member

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    What is "the whole setup" you installed?
     
  6. 12boss302

    12boss302 Active Member Established Member

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    VMP GEN2R with 72mm VMP TB.
     
  7. forsho

    forsho Member Established Member

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    The TB is probably causing the surging. Have you had it unplugged from power recently? Afterwards my idle is choppy until I've given the tune time to "settle".

    I had to replace a battery and I flashed it back to the 93oct tune, and its always choppy for the first 50 miles or so depending on the driving. I can always tell once my higher than normal idle returns when pulling up to stop and dips once I until I come to a complete stop.
     
  8. forsho

    forsho Member Established Member

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    Also, what is cold? the shelby is pointless in anything below 35F.
     
  9. 12boss302

    12boss302 Active Member Established Member

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    Yea I feel that’s like mine. Overnight, it’ll run kind of choppy for the first 5 minutes or so and then it’s fine. It’s really weird. I’m gonna have my tuner look at it and see what’s going on from there, if that doesn’t work, then I’m going to contact Justin and VMP to help me out. As for cold, it’s usualky about 40-50. I just got my new clutch so I have to break it in anyways, won’t know much more until after the 500 miles.
     
  10. lexustech48

    lexustech48 I like Fords n stuff Premium Member Established Member

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    I have a stock TB on my Lund tune currently and the higher idle during coast happens to me as well. My monoblade Lund tune curiously doesn't have that issue.
     

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