Q: Rom is running high in my truck

asked by on

i replaced my head gasket in my truck, after i was done, my rpm runs extremely high now and i replaced my air control valve. So i know its not that. i checked all my hoses and made sure they was right and none was unhooked and i didn't find any and i looked multiple times. I also checked my throttle body and that is fine. Does anyone have any idea what it could be? my rpm goes up to 5,000 when its idling. thank you

My car has 580000 miles.
My car has a manual transmission.

Hello. This is a sign of a vacuum leak. A vacuum leak can be one of the most frustrating and difficult problems to diagnose. Idle speed that is way too fast is one of the common signs and stalling is another. Confirmation of an engine vacuum leak can be a very loud hissing sound coming from the engine area.

Hesitation can come from accelerator problems but it also may be symptomatic of an engine vacuum leak. A vacuum leak is a problem that creates consequences that will include both poor fuel efficiency and a loss of power in the vehicle. The air-to-fuel ratio is a critical factor in the proper operation of an engine. The proper amount of air has to be present in order to maintain proper firing sequence and running conditions. The leak can result in an imbalance in the air/fuel mixture that is injected into the engine. When this happens, this can cause the engine to stall or the RPM’s to rise abnormally. I would suggest having a professional, such as one from YourMechanic, come to your location to diagnose the high idling issue and proceed with proper repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Rom is running high in my truck

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: Engine takes too long to warm up runs poor until it warms up.

There is only two possible causes of an engine running colder than it is supposed to. The fan clutch may be locked up and would cause a load on the engine and excessive airflow across the radiator not allowing the...

Q: hard starting after engine has run. 1996 Ford F-150

Hey there, thanks for writing in. From what you describe, it sounds like the engine TFI module on the side of the distributor is most likely bad and causing the no start hot. If you would like to have this...

Q: Welding the harmonic balancer to crank shaft? 1991 Chevrolet S10

Hello - No, welding the harmonic balancer to the crankshaft is not a good idea for at least 2 reasons. Welding the balancer hub to the crankshaft will damage or reverse the benefits of heat-treatment to the crankshaft itself -...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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.