What does it mean when your car is surging at low rpm?

What Is Surging? If the engine’s idle speed is not constant but is increasing and decreasing, it is known as surging. At low RPM, you can feel the vehicle shaking or vibrating; that’s also a sign of surging. There may be two situations of surging at low RPM.

When do the RPMs go up or down?

For example, RPM’s quickly move from 1,250 to 1,500 at 45 MPH. This problem has been ongoing for two years (and driving me a bit mad). The condition is most pronounced when traveling between 15 and 45 MPH. I’ve never once noticed the condition at highway speeds (above 55 MPH.

Why does my car keep fluctuating in rpm?

Do to the fact the transmission operation is somewhat temperature depending, it makes sense that there are internal transmission problems or Torque converter issues, though torque converter issues are fairly rare on the Gas engines. On the TDV6 it is common, although they use the same transmission they use a different torque converter.

What to do about fluctuating rpms at constant throttle?

1. Make sure the coolant system is fully bled. 2. Make sure you have no coolant leaks, check the plastic bleeder valve under the engine cover. They are plastic and do go bad. 3. Make sure you have no intake leaks and have good crankcase breather valve.

Why is my car surging at idle speed?

When an engine’s computer can “hunt” or “surge” at cruising or idle speeds it is searching for program compliance, there is a problem elsewhere in the system.

When do the engine RPMs bounce when driving?

It seems to happen primarily when traveling between 45-55mph. When driving, slightly accerating, the truck is doing about 1100 rpm in its 6th gear. The engines RPMs seem to bounce back and forth 50-100 rpm. It is not the usual ‘bounce’ you get from v4 to v8 mode, it is happening while accelerating which i can see is keeping it in v8 mode.

How often does fuel pressure surge at idle?

Watching the fuel pressure at idle stays around 5200psi and when it surges up goes to around 9000psi. It’s up and down about every 15 seconds. And you can also feel it at a slow speed. Could someone lead the right direction, I do automechanic by trade I just don’t do a lot of diesel work.

What happens when engine surging causes engine to lose speed?

Engine surging, will cause the engine to momentarily lose (rpms); but then regains, normal engine speed. Engine surging, can affect drivability but; can also cause error codes to appear in your, OBD-II system.

When does the RPM meter go up or down?

RPM meter goes up when you accelerate and comes down when the car slows down. RPM stands for Revolutions Per Minute, and it indicates how many times the crankshaft revolved to produce engine power.

What causes engine RPMs to fluctuate while driving?

Failing Electrical Components: A problem or failure in the ignition system or various electronic components can cause a rough idle. If this is the case, the problem will usually get worse as RPMs increase. Common culprits include the ignition control module, plug wires, coils, and spark plugs.

How to fix a surging engine in a car?

Easy step by step guide on how to repair an automotive engine that is surging, this information pertains to most vehicles and is listed in the order of popularity. Start with the vehcile on level ground, engine “OFF” in park with the emergency brake set, wear protective gloves and eye wear for safety.

What are the RPMs of a Silverado truck?

alkaspeltzar wrote: Hey guys, my 2010 5.3 AFM Silverado w/66,000miles has been RPM surging while driving over the past couple weeks. It seems to happen primarily when traveling between 45-55mph. When driving, slightly accerating, the truck is doing about 1100 rpm in its 6th gear. The engines RPMs seem to bounce back and forth 50-100 rpm.