Skip the auto shop - Our mechanics make house calls

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.

A: Hello. This is a sign of a vacuum leak. A ...

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?

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: Steering column change?

Hi, thanks for writing in. Without being able to look at the engineering specifications for the two steering columns, they cannot be compared without having them side by side and comparing them. If you would like further help, consider having...

Q: I need help replacing stock headlights with Halo LED Projector HID headlights.

This is more of an aftermarket-type of repair. You are right about needing 2 more ballasts, and I recommend you get them from the same manufacturer as the kit you have. For this type of modification, consider visiting a local...

Q: How do I replace a passenger side window?

Hello, thank you for writing in. It can be done at home, but may take up half your day. To start you will need to remove all of the weather stripping, regulator, and arm. Install the new window into its...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...