Skip the auto shop - Our mechanics make house calls

Q: I have an aftermarket intake and it's reading 4.9 psi. Is that good or bad?

asked by on

Aftermarket intake

My car has 171000 miles.
My car has an automatic transmission.

A: Hi there. An intake manifold should read 1...

Hi there. An intake manifold should read 19 to 22 hg. This is 19 vacuum to 22 vacuum. If you are getting a psi reading, then there is either a turbo on your vehicle or the engine timing is out of sequence. Recheck with your gauge to determine what you are seeing. If you meant to say 4.9 hg (vacuum), then check the bolts to see if they are tight. Then check the gasket and make sure that its secured on all of the ports to the engine. If you need further assistance with a major vacuum leak, 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: Clock not working

The clock fuse would need to be checked first. If that is okay, then the clock should be checked to make sure that it has a proper supply of power and grounds. If that is okay, then a replacement clock...

Q: There is a lot of paint flaking off, what can I do?

The only thing that can be done with paint issues, whether it be peeling, fading or bubbling, is sanding and repainting the affected area or the whole car, if needed. The problem is not a thin clear coat issue. It...

Q: I changed the motors and it starts and runs great at low rpm. If I try to accelerate it sputters and falls on its face.

Hi there. Check all of the vacuum lines to the engine and make sure that they are all connected or plugged off if they are not needed. Check the spark plugs and see what condition they are in. If the...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...