Q: Iac
My car keeps reving up real high by itself, changed tps, map sensor, iac valve, and no leaks. I changed the iac twice and still having same problem, the valve keeps staying in the hole and not coming out, that’s why engine revs. Cleaned the hole and everything. 2 new iac. If I unplug the iac it doesn’t do it. Can you please help.
This can be caused by the main engine computer has the IAC shorted full open or there is a short in the wiring to the IAC that holds it open. If you do not get any codes or do get IAC fault then you may need to replace the PCM.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
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
What others are asking
How do I use the rear seat warmers?
The rear seat warmers are controlled by the Rear Seat warmer switches, which are on the inside of both rear doors. To use a rear seat warmer, press the corresponding switch. Press the switch again to turn off the warmers....
Air conditioning leak
Hello. If your AC system is suddenly not blowing cold, then it may indeed be low due to a leak. In some cases, you can take a look at all of the AC system hoses and connections and if any...
Seat belt lock not working.
Hi. If your seat belt lock is not working, then that is something that should be repaired as soon as possible for safety reasons. The seat belt should lock when the belt is moved at a quick rate as a...
Advice on buying a 1997 Volvo S70 with 190,000 miles
If it's a running car and it runs good--that's what that car probably would go for. I personally wouldn't buy an S70 because I work on them for a living. I've worked on quite a few of them and they...
has a very bad misfire.specified ignition coil has been changed
A single cylinder misfire won't keep a motor from running, so whatever the issue is, the #2 cylinder misfire is likely a symptom of the problem. With 180,000 miles on the vehicle I would wonder if there is a problem...
car is not cranking, wont start.
Usually when the car will not crank but has power to other systems, the starter is a possible cause of this issue. Considering that you have had the vehicle for 9 years and never changed the battery, it is also...
Would a click, click sound (battery 100% charged) mean a bad starter solenoid, or bad alternator?
Hello. We will be happy to assist you. The issue your vehicle is having may be caused by faulty wiring such as corroded battery to starter wiring or a loose battery terminal. The most likely causes are a bad starter...
My car won't stop unless I floor the brake pedal. Brake Check replaced the booster, and the brakes locked up. 5000 rpms just to go
Hi there. The best advice I can offer is to let a professional mechanic come to your location and complete a brake system inspection as soon as possible (https://www.yourmechanic.com/services/brake-system-inspection). There are too many possible issues to list, especially possible ABS...
Why won't my car start?
Hi Ester. Thanks for contacting us today. The first step in diagnosing a problem like you've described is typically tracing and verifying electrical connections that engage the starter. This would begin with the car battery, followed by ground wire connections...
Related articles
2012 Chevrolet Silverado vs. 2012 Dodge Ram: Which One Should I Buy?
When you are looking for a way to get a load of mulch or gravel, or need to haul a large trailer or boat behind your vehicle, chances are you are looking for a truck. Trucks are not meant to...
Symptoms of a Bad or Failing Oxygen Sensor
Common signs of a faulty car oxygen sensor include the Check Engine Light coming on, bad gas mileage, and a rough idle.
How to Check an Idle Air Control Valve
Idle air control (IAC) valves regulate the engine idle speed. Engine idle speed is the revolution speed of the engine when the throttle is inactive.
Browse other content
Cities
Services
Maintenance