2001 Dodge Ram truck surges while driving

  • 2001 DODGE RAM
  • 5.9L
  • V8
  • 4WD
  • 150,000 MILES
My dodge ram 1500 5.9l surges up about 100 to 200 rpm while driving then goes right back to where it was, whether it is in cruise or using gas peddle the truck seems like it runs fine otherwise I have replaced both 02 sensors and have checked for vaccum leaks but did not find any? I also have a cool air intake system, replaced the fuel filter fairly recently along with the throttle body gasket.
Do you
have the same problem?
Monday, October 13th, 2014 AT 9:26 AM

1 Reply

The torque converter is unlocking intermittently. The most common cause is the brake light switch is out of adjustment. Less common, there could be a bad spot in the throttle position sensor. First try holding the brake pedal up with your foot. If that helps, readjust the brake light switch. Mechanics use a scanner to view live data, and that will show the state of the brake light switch, the signal voltage from the throttle position sensor, and other things that can cause the torque converter to unlock.

When this problem is not occurring, you can replicate it by driving at a steady highway speed, (not with the cruise control), hold the accelerator pedal steady, then tap the brake pedal with your left foot. You'll see engine speed increase 200 rpm, then drop back down a couple of seconds later. You'll feel the torque converter lock and unlock too.

On Chrysler products, other than diesel engines, you'll never solve a running problem by replacing the fuel filter. They easily last the life of the vehicle.

You would do well to throw that cool air intake system away. Liquid gasoline does not burn. It has to be turned into a vapor to burn. One purpose of all intake systems is to warm the air so that happens faster. The thinking of the people who promote these things, as long as you have money they can get from you, is colder air is more dense so more can be packed into the cylinders, then you add more fuel to get more power. The rest of us do the same thing by pressing the accelerator pedal further. The only place there are real benefits to cooling the air is when it can get so hot as to promote preignition, or when too much heat builds up, as in diesel engines with turbochargers.
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Monday, October 13th, 2014 AT 3:53 PM

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