Q: Q: Iac

asked by on

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.

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

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: Low idle on van

A low idle can be caused by many things for example a bad Idle Air Control Valve, or faulty catalytic converter. There are so many variables that it is best to seek the help of a technician for a good...

Q: Which of the following is most likely to be caused by too cold of a temperature in the transmission fluid?

Claimed by Kevin Gainer

Q: Getting codes P0455 and P1470

Hello. Your codes bring up two completely different problems. The P0455 is for a small leak in the evaporative emissions system. Most of the time it is as simple as replacing the gas cap and clearing the code. If...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.