Why does my truck rev up when I put it in park?
Why does my truck rev up when I put it in park?
The idle is controlled by the idle air control valve and if it cannot keep the engine idling it will keep trying to rev the engine up to compensate. A vacuum leak, sensor that has failed, or an EGR system malfunction could potentially be the cause of the erratic engine you’re experiencing.
Is it possible to see a surge in rpm?
On many cars it is easy to see it kick on – a small drop in rpm w/out a gear change, and then see it kick off – a small rpm increase. Yes, the surge happens in that range. It has not always done this.
What should the engine RPMs be 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.
What causes the RPM to go up or down?
While cruising at any given speed, I will come to a stop sign or red light or a situation that causes me to take my foot off the gas. The idle will stay at whatever the cruising idle was for about 2 seconds, then increase a couple hundred RPMs, then come down to the normal RPM.
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.
What causes a car to surge at low rpm?
There may be two situations of surging at low RPM. The most common one is when in an idle state, a vehicle begins to surge at a low RPM. In the second case, the car is likely to move at a slower speed with a low RPM, which causes it to surge.
On many cars it is easy to see it kick on – a small drop in rpm w/out a gear change, and then see it kick off – a small rpm increase. Yes, the surge happens in that range. It has not always done this.
Why do the RPMs go down when shifting into Park?
As for shifting into Drive, the RPMs will slightly go down because the engine connects to the transmission, and the resistance of the transmission fluid takes energy from the engine and lowers the idle speed slightly. Vice versa, when shifting into Park, the RPMs will go up temporarily because that resistance is no longer there.
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.
