Skip the auto shop - Our mechanics make house calls

Q: Why does my van always stay at a high idle 2000 Chevrolet Express

asked by on

When I start my van it starts at high idle, it lowers a little then goes back up. It stays at a very high idle while driving. I can take my foot of the accelerator at 45 mph and it'll stay at that speed and sometimes climbs. When the problem first started it would correct it self after driving 15 or so minutes. Now its always at a high idle. Ive start to turn the vehicle off while its still in gear to prevent the transmission from slamming into park. I've recently replaced the EGR valve, throttle position sensor and mass air flow sensor.

My car has 192000 miles.
My car has an automatic transmission.

Hello. There are a lot of reasons that would cause a high idle, but most of the time it is caused by a vacuum leak. When there is an excessive amount of air entering the engine the computer will compensate with more fuel causing a higher idle. Most of the time the issue is in the intake manifold gasket. I would typically start by checking the engine sensor readings with a scan tool and then check for vacuum leaks with either propane enrichment or by performing a smoke test. If you need to have this idle issue repaired, consider YourMechanic, as a certified mechanic can come to you to [diagnose this high idle problem]

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!
  1. Home
  2. Questions
  3. Why does my van always stay at a high idle 2000 Chevrolet Express

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: Rebuilt engine rough idle and wanting to die.

The carburetor may need to be rebuilt or adjusted. The EGR system may also be causing the rough idle due to the EGR partly stuck open. The only way to isolate which one is causing the issue would be to...

Q: Warm engine high idle

Hi There, This may be a sign of a vacuum leak. High idle speed, stalling and hissing sounds are common signs of a vacuum leak. When a vacuum leak is present in an engine, this causes an excessive imbalance in...

Q: Oil leak

Hi There, Unfortunately, there is not much you can do if the oil pan has two holes in it that are causing it to leak oil. This can cause major engine damage as you may know should the motor leak...

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...
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...
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.