rpm s surging

**noahraysanders** · 07-31-2009, 02:33 AM

my rpms surege between 40-50 mph please help

**2COR517** · 07-31-2009, 07:41 AM

What year/model/engine/transmission? Do you have a tach, and the guage is moving, or can you hear the engine surge, or both? And how much variance in RPM do you have?

**jdickerson83** · 08-02-2009, 07:22 AM

2COR517,

I had a similar problem w/ my 96 Blazer. All I did was add more transmission fluid and it's worked fine ever since. Check the tranny fluid and if it's low, that's your problem.

Good luck.

**jdickerson83** · 08-02-2009, 06:27 PM

Glad you got everything taken care of

**noahraysanders** · 08-03-2009, 10:22 AM

Originally Posted by 2COR517

What year/model/engine/transmission? Do you have a tach, and the guage is moving, or can you hear the engine surge, or both? And how much variance in RPM do you have?

2002 chevy silverado 5.3
i can see the tach move and here the engine surge

**2COR517** · 08-03-2009, 10:59 AM

I presume you checked the ATF. Can you give a little more info? What driving conditions, hills, flat, etc. Throttle position. If you speed up to say 70, does it stop?

**Jimmiee** · 08-03-2009, 11:57 AM

Originally Posted by noahraysanders

my rpms surege between 40-50 mph please help

Another thing to check is to see if it will do it in 3rd, then second. If it does it's not a transmission problem.

**noahraysanders** · 08-03-2009, 05:14 PM

Originally Posted by 2COR517

I presume you checked the ATF. Can you give a little more info? What driving conditions, hills, flat, etc. Throttle position. If you speed up to say 70, does it stop?

it does it between 40 -50 mph on any incline

**Jimmiee** · 08-03-2009, 06:21 PM

Originally Posted by noahraysanders

it does it between 40 -50 mph on any incline

It could be the torque converter locking and unlocking. A bad brake switch can do this. To determine if it's the converter or not drive it at 45 MPH and when it starts surging press the brake pedal down about 1 or 2 inches. Just enough to turn on the brake light but not hard enough to apply the brakes. This will unlock the converter. IF it quits surging then you have found the problem. If it doesn't quit you can at least rule out the torque converter.

**noahraysanders** · 08-04-2009, 10:09 PM

[QUOTE=Jimmiee;162888]It could be the torque converter locking and unlocking. A bad brake switch can do this. To determine if it's the converter or not drive it at 45 MPH and when it starts surging press the brake pedal down about 1 or 2 inches. Just enough to turn on the brake light but not hard enough to apply the brakes. This will unlock the converter. IF it quits surging then you have found the problem. If it doesn't quit you can at least rule out the torque converter.[/QUOT

i have to keep my foot on the gas too right