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] https://www.yourmechanic.com/services/engine-idle-speed-is-high-inspection

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: Power windows not working.

The fact that all your windows are not working actually sort of narrows down possibilities. The power coming into your power window circuit is fused voltage, meaning it has a fuse to protect the wiring in case of a short...

Q: My car rpm fluctuates slightly, during warm up and my temperature gauge also fluctuates intermittently.

Hi, thanks for writing in. My first impression when you described the vibration is that you may have a bad motor mount. When you put the car in Drive or Reverse, the engine shifts slightly. If the rubber in the...

Q: Headlights stay on permanently

It sounds like you may have an electrical short somewhere in your lighting system. The short is most likely a short-to-power rather than a short-to-ground. The two circuits may have collided at some point within your wiring system. 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...
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...
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...