Q: Q: High idle problem.

asked by on

When I start my truck my idle stays at 1500 and won't go down
My car has a manual transmission.

This may be a sign of a vacuum leak. A vacuum leak can be one of the most frustrating and difficult problems to diagnose. High idle speed is a common sign and stalling is another. Confirmation of an engine vacuum leak can be a very loud hissing sound coming from the engine area. When a vacuum leak is present in an engine, this causes an excessive imbalance in the air/fuel ratio which creates a loss of power and causes the motor to run at a much higher RPM as a result of the increased oxygen present in the fuel charge being injected into the motor. I would recommend having an expert from YourMechanic come to your location to diagnose your vacuum leak as these can be very difficult and time consuming to trace.

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. Q: High idle problem.

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: The manual and how to fix it....5th gear is not working I went by a machanic n the gears are still not going in well

Hello. If you still are not getting 5th gear then you have an issue within the transmission. If the transmission is brand new then it should be taken back to where you purchased it from. If this was a used...

Q: My truck is backfiring when idling and when accelerating will not drive.

You may have a broken valve spring or sticking valves and will need to have the engine compression tested to see if one or more cylinders are low on compression and may need to have a valve job done. ...

Q: Q: My car will not go over 20 mph.

Hi there. Check the fuel pressure regulator and make sure that its working and plugged in. Put a fuel pressure tester on the fuel rail and make sure that there is good fuel pressure of 45 to 65 psi. If...

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...
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...
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.