I own a 04 hyundai accent 1.6L. I was on hmaservice.com and was wondering what the ISA sensor is on the throttle body. When I have the key turned to the on position I get a buzzing sound from this sensor. Just wondering what it is and if that is normal.



Also how do you adjust the TPS? My car has signs that mine could be failing or is not adjusted properly.





Thanks

 

Are you referring to your Idle Air Control Valve buzzing when you turn the ignition on? If so then that is normal because it's an air pump.



You can't adjust the TPS, you can try re-seating it though. Usually if it's bad then you will have to replace it.

 

^ correct but his is called an Idle Speed Actuator(ISA), doesn't really matter though.

 

I removed the isa and cleaned out all the carbon from the valve. How can you tell if they are not working properly?I know they sensors don't always throw codes. My 04 accent runs rough at idle and if lightly pressing the brake jerks the car forward and stops.

With the tps is had range from closed to open (used a volt meter) however when driving and keeping the car at speed, sometimes the rpms will raise and fall. The car doesn't always go any faster just hear the engine rev. Could this still be the tps?



Thanks

 

Does your car have a Mass Air Flow Sensor? I had a crack in the rubber elbow after the MAF sensor that caused similar symptoms due to a vacuum leak, but it also threw a service engine light after the engine died a few times. If you do have a MAF sensor try spraying some MAF sensor cleaner on it to see if your idle improves. That spray also can be used to clean dirt/residue off electrical connector contacts because it's safe for use on plastic and rubber parts and evaporates quickly.



Here is how to test the TPS on my year car. Your's might be different so you should look it up but the concept is the same.





I have some old TPS sensors laying around here somewhere that jump around instead of changing smoothly as you open the throttle. These happened to be ones I purchased at the local auto parts store that lasted like 4 months before acting up again. I then purchased an OEM one for like $35 and haven't had a problem for over 80,000 miles.

 

Where abouts do you live cause the cheapest TPS I can find is 98 dollars at part source. But I live in Canada. Is it true that when you buy a new TPS that they have to be adjusted? Ok still trying to get the hang of my new volt meter. I have it set to ohms. On auto my TPS ranged between 0.956 k ohms at close and 2.879 k ohms at full open. Rarely the ohms would stay at an ohms even if the throttle wasn't touched. The numbers still moved around. If I set the volt meter just to ohms,I didn't get any reading.



Also is it easy enough to remove fuel injectors? I believe you remove the fuel pump fuse, wait till the car stalls. Unbolt the fuel rail and pull up on the rail to release the injector from the head. Unclip the injector harness and remove the clip injector and pull the injector out of the rail. Is this right?



Where is the EGR valve? Thought it would be by the cat, but didn't see it?



Lastly what is the solenoid that is at the top of the firewall on the passengers side behind the intake? Look like it connects to a fuel line on the firewall and the other side to the bottom on the intake throttle plate. Pressure line or evap?