Q: When I give my car gas and let off it keeps throttling up by itself, I changed the tps sensor no help

asked by on September 21, 2017

When I give the truck gas and let off the throttle keeps goin up by itself. Changed the tps sensor but no help
My car has an automatic transmission.

In the majority of vehicles, engine idle speed is controlled by an idle control valve (ICV). The ICV valve can fail or a faulty or blown fuse in other electronically controlled systems can cause the IAC motor to malfunction, leading to a higher than normal engine speed. Failures in the ICV valve itself are often due to excessive carbon buildup in the intake manifold. Other possible causes of uncommanded high engine speed include vacuum leaks, a malfunctioning throttle and, rarely, a PCM/ECM malfunction. With regard to vacuum leaks, on a fuel injected engine a vacuum leak will cause higher engine speed as the engine’s oxygen sensor detect the extra oxygen entering the engine through the vacuum leak. The newly lean (too much air relative to fuel) status will result in the engine’s computer pumping in additional fuel, resulting in an abnormally high speed. If you desire that this problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine speed diagnostic - high idle/uncommanded high RPM and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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

code p0446

Hi there. A P0446 (evaporative emissions system gross leak detected-Toyota defined meaning) sets when there is a fault detected in the evaporative system. The evaporative system is an emissions system responsible for preventing the leakage of fuel vapor into the...

2003 dodge neon with 2001 engine swap now it won't start replaced cps and cam sensor what could it be

Hi there: Without being there to inspect the installation work or complete a diagnostic scan to see if you have any error codes, it's nearly impossible for us to help you with this issue. Like any major repair, you might...

My 2014 dodge journey has tried to overheat 2 times in 6 weeks. Both times tge coolant level was low.

Hello there. If the dealership has indicated that you have coolant inside of a cylinder, then it is quite likely that the head gasket failed, causing coolant to seep into the oil galleys and into the combustion chamber. However, a...

Related articles

The Best Used Cars to Buy If You Live in a City
Living Living and driving in the city means you’re faced with parking constraints, narrow streets, and the constant stop and go of traffic. With all of that said when you’re ready to purchase a used vehicle these are all things...
2011 Dodge Ram vs. 2011 Ford F-150: Which One Should I Buy?
Large trucks can be fun to drive, and even more fun to get dirty. Unfortunately, they may also cause you to get phone calls from friends who need to move into a new apartment. Fortunately, just having a truck may...
The Best Used Cars to Buy If You’re a Vet
The The best car for a vet to own largely depends on the type of practice he or she has. Large animal vets are probably going to want something that delivers a fair bit of power, and possibly even towing...