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・Save up to 30%

Get a quote

What others are asking

Q: Car only clicking and not starting

It appears that you have been trying to resolve the starting issue with your Honda Civic but have not been able to resolve the issue on your own just yet. The symptoms you describe lead me to believe that your...

Q: How do you clear all information from the HandsFreeLink system?

There may come a time when you need to wipe the information from your HandsFreeLink® (HFL) system. Perhaps you’re selling the car and don’t want that information going to the buyer. Maybe you’re passing the car down to your college...

Q: vacuum hose collapse for brake booster

No it is not supposed to collapse. The hose has most likely got soft from oil or other contaminants and should be replaced. If you find the hose has fluid in it and it is brake fluid, then your brake...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...