UGH! What is causing this??
#1
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UGH! What is causing this??
This surging, hesitation, thing is driving me absolutely insane. It only happens at WOT, if I'm at 3/4 throttle and in boost, it's fine. Driving normally is fine too. The issue started happening about a month ago, then I lost 2nd gear on the 4L80E. I just got the truck back with a new built 4L80E, thinking the surging/hesitation would have been attributed to the transmission, but it's doing the exact same thing! Tomorrow I'll be changing the plugs/wires but I'm not getting any CEL's and no knock (according to the aeroforce gauge) when the problem happens.
Could it be the torque converter? I don't think it's the tune as it's Kyle's old truck and the thing has been painstakingly tuned by him before I bought, and I haven't made any additional modifications.
https://www.dropbox.com/s/tshtktgqfy...503_003132.mp4
https://www.dropbox.com/s/s4z6e1rr6v...503_004010.mp4
Any help would be appreciated.
Could it be the torque converter? I don't think it's the tune as it's Kyle's old truck and the thing has been painstakingly tuned by him before I bought, and I haven't made any additional modifications.
https://www.dropbox.com/s/tshtktgqfy...503_003132.mp4
https://www.dropbox.com/s/s4z6e1rr6v...503_004010.mp4
Any help would be appreciated.
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Thanks for the response Gadgetized. Unfortunately I don't own HPT or EFI Live (which it was tuned with). Yesterday I took it to a reputable tuner in Houston to see if he could datalog it, but the tune was locked. We put it on the dyno and he logged what he could while doing a few pulls. Ironically, the symptoms weren't able to be replicated. It was incredibly frustrating. The truck pulled smooth and hard, the tuner said from what he could see it looked solid.
Skip a few hours to last night, I got on it and low and behold it started acting up again. I do see the AFR being squirrely when it happens, so I don't know what to do. I'll have to wait until Kyle is back up and running and see if he can datalog it on the street.
Skip a few hours to last night, I got on it and low and behold it started acting up again. I do see the AFR being squirrely when it happens, so I don't know what to do. I'll have to wait until Kyle is back up and running and see if he can datalog it on the street.
#4
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Fill your fuel tank to the top.
It should be good at over 1/2 tank, but would eliminate that variable. The pump might not be sitting exactly on the bottom of the tank. That is something that would not show up on a dyno like in real world conditions.
It should be good at over 1/2 tank, but would eliminate that variable. The pump might not be sitting exactly on the bottom of the tank. That is something that would not show up on a dyno like in real world conditions.
Last edited by Gadgetized; 05-03-2014 at 10:42 AM.
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Unfortunately I had a full tank last night. Ironically though, I'm sitting in my truck right now and looking at the gauge and it's bouncing between full and 3/4 full like crazy.
Last edited by KB; 05-03-2014 at 11:32 AM.
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Thanks for the response, Terra, unfortunately I'm dealing with a turbo here not a belt driven supercharger.
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