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Chevrolet Forum - Chevy Enthusiasts Forums (https://chevroletforum.com/forum/)
-   1988 - 1998 (GMT400) (https://chevroletforum.com/forum/1988-1998-gmt400-106/)
-   -   Surge After Shifting (https://chevroletforum.com/forum/1988-1998-gmt400-106/surge-after-shifting-103760/)

Red 94 January 16th, 2021 1:45 AM
Surge After Shifting
 
Hello,
I have a '94 K1500 with a 4.3L and NV 3500 transmission and I've noticed a strange surge, or jerking, sensation after I shift to the next gear when driving. When it's cold and has just started to get on the road, it's fine. After everything has warmed up, I'll grab a gear and the truck starts to jerk around and sounds like it's losing it's fuel supply and trying to shut down on the highway. Once in a while it will surge while at a cruising speed too. I have recently replaced the fuel pump and the fuel filter, and the air filter looks decent. I was just hoping to pick your brain and see if you had any ideas that I could check out. Thanks for any help!

oilcanhenry January 16th, 2021 4:46 AM
Originally Posted by Red 94 (Post 458944)
Hello,
I have a '94 K1500 with a 4.3L and NV 3500 transmission and I've noticed a strange surge, or jerking, sensation after I shift to the next gear when driving. When it's cold and has just started to get on the road, it's fine. After everything has warmed up, I'll grab a gear and the truck starts to jerk around and sounds like it's losing it's fuel supply and trying to shut down on the highway. Once in a while it will surge while at a cruising speed too. I have recently replaced the fuel pump and the fuel filter, and the air filter looks decent. I was just hoping to pick your brain and see if you had any ideas that I could check out. Thanks for any help!
I think you have a bad Throttle Position Sensor (TPS) on your Chevy..

Mr. Dude with a face January 16th, 2021 7:48 PM
@oilcanhenry How would that cause the surge? Would it be caused by a dead spot in the sensor, so every time he hits that spot it stumbles? I think it is safe to assume he has good fuel supply, but we should also consider the truck would have TBI, right?

Red 94 January 17th, 2021 3:12 PM
Yes the truck has a TBI set up. Where it was happening when I let the clutch out I was wonder if it could possibly be the clutch or the pressure plate. I keep forgetting how many sensors are on these trucks.

oilcanhenry January 18th, 2021 9:41 AM
Originally Posted by Mr. Dude with a face (Post 458998)
@oilcanhenry How would that cause the surge? Would it be caused by a dead spot in the sensor, so every time he hits that spot it stumbles? I think it is safe to assume he has good fuel supply, but we should also consider the truck would have TBI, right?
TBI has a Throttle Body Sensor.

oilcanhenry January 18th, 2021 9:43 AM
Originally Posted by Red 94 (Post 459037)
Yes the truck has a TBI set up. Where it was happening when I let the clutch out I was wonder if it could possibly be the clutch or the pressure plate. I keep forgetting how many sensors are on these trucks.
Post some OBD I codes if you can.

Red 94 January 19th, 2021 12:12 PM
I haven't noticed any lights coming on when it does that. Could there be codes if there are no warning lights?

oilcanhenry January 19th, 2021 5:42 PM
Originally Posted by Red 94 (Post 459146)
I haven't noticed any lights coming on when it does that. Could there be codes if there are no warning lights?
Yes there can be.

Red 94 January 20th, 2021 3:14 PM
Sounds good. I'll see what I can find. Thanks for the help

oilcanhenry January 23rd, 2021 4:06 AM
Originally Posted by Red 94 (Post 459234)
Sounds good. I'll see what I can find. Thanks for the help
No problem. That's what we are here for, Red 94..


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