Q: High idle 1500 rpm

asked by on

Upon start up truck will idle at 1000,after 10 seconds it climbs to 1500 and remains there. Before this problem idled at 700 at all times. Since problem started replaced IAC, TPS, MAP, CTS, was getting codes for those so replaced them thinking problem would solve but still the same. I also replaced throttle body gasket and no change. I have searched for a vacuum leak and have found nothing. Right now I believe the truck is undrinkable, I also unplugged battery to reset computer but didn't do anything either. Any suggestions? Anybody have experience with these TBI motors?

My car has 258000 miles.
My car has a manual transmission.

I would look again real carefully for air leaks. Some of them can be pretty tricky. There might be a leaky component or even a leaking brake booster. A can of carb cleaner can help with this, but you’d better have a fire extinguisher handy. The next thought is that there is some buildup on the throttle plate that is preventing the throttle from closing completely. This can often be remedied by removing the throttle body and giving it a good cleaning. If you don’t find anything there, I suggest you have it checked out to be sure your money is going to the right place. You can have that done at your convenience by contacting YourMechanic. They can send a technician to your home or office to check out your high idle problem and tell you the solution.

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. High idle 1500 rpm

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: How do I use the autostore stations?

The autostore system searches for the radio stations with the strongest signal, and stores the top six so that you can easily access them. Using the autostore system is very easy: Set the radio to FM or AM by...

Q: car starts only when held in cranking position.

Hi Juan. Thanks for contacting us tonight. Typically this issue happens because the electrical circuit from the ignition switch, to the starter is not completed, so when you let go of the key in the forward position, power will stop...

Q: Truck idles poorly, starts jumping

There are numerous potential causes for the symptoms you are having. The first thing that comes to mind is a vacuum leak (unmetered air allowing the engine). Vacuum leaks are noticeable at idle and not under load while accelerating. There...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...