Skip the auto shop - Our mechanics make house calls

Q: Loss of power once I hit 70-80 mph

asked by on

When I floor on the gas pedal my truck picks up quick and gains speed quick until I get to 70-80 mph I loose power but not all of the power

My car has 89000 miles.
My car has an automatic transmission.

A: Hi there. Check the fuel pump and make sur...

Hi there. Check the fuel pump and make sure that its working. Check the fuel pressure on the fuel rail and see if there is a loss of pressure. Its common for the fuel pump in the Silverado 1500 models to loose efficiency when there is a demand for a higher fuel pressure. Also, check the fuel pressure regulator on the fuel rail for any debris. I recommend performing an injection flush to clean out the fuel system and clean out the injectors. If you have an inline fuel filter, I recommend replacing the filter. Then retest the vehicle to see if the engine will have a loss of power at 70 to 80 mph. If there is still a loss of power, then I recommend replacing the fuel pump. If you need further assistance with a loss of power at 70 to 80 mph, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Aircon blowing out white stuff.

There shouldn't be any dangerous materials in the AC system. But it is possible that you have a buildup of dust or even mold. Your car has a cabin air filter that is supposed to keep anything out of the...

Q: How to tell if my Yukon has active brake control or not?

If you have a traction control switch to turn traction control on and off then you do not have active brake control. If you do not have the switch then you should be equipped with active brake control.

Q: fuel volume regulstorcontrol circuit /open

Hi there. The fuel pressure volume regulator control circuit/open requires circuit test be performed. A scanner would help for monitoring the parameter. The fuel pump could be at fault, with little or no fuel pressure, the PCM (powertrain control module)...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.