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.

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
  • Home
  • Questions
  • I have an aftermarket intake and it's reading 4.9 psi. Is that good or bad?

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: My Honda overheats than starts to die.

The first place to go with an overheating problem is the thermostat. Often it is the cause, but even if it isn't, overheating can damage the thermostat so you need to go ahead and change it to be sure. Making...

Q: How do I fold down the rear seats?

The rear seats can be folded down to create extra storage space in the rear of the vehicle. Folding the rear seats takes a few steps, but is easy: 1. Latch the center seat belt into the side of the...

Q: After replacing the power steering pump there was a low idle, idle screw is all out, running rich, and idle speed doesn't change.

Hi there. The engine has a vacuum leak and is causing the engine to stumble down on the idle. Check all of the vacuum hoses and the brake booster for any leaks. The engine is rich for it's not burning...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.