What should my throttle position read at idle?
At idle is should be zero or a couple of degrees. Press down on the gas pedal very S-L-O-W-L-Y until the throttle is all the way open. If the TPS has a worn spot, most likely it will be between 0 and 20 percent throttle opening. Try holding the throttle between 0 and 20 percent to see if you get a steady reading.
Is the throttle fully closed on the potentiometer?
You may see that this reading never reaches 0%, and in some cases does not also reach 100%. There are a few reasons for this: The reading is relative. 13% on the potentiometer may be fully ‘closed’ in terms of throttle.
What should the voltage be for wide open throttle?
If the voltage you get is not within spec, loosen the TPS retaining screws and adjust as necessary. Normal voltage reading for wide open throttle (WOT) is above 4.00 volts. There are trouble codes that are associated with the TPS. One code will set if the TPS voltage is too high when the computer expects to see it lower.
When is a bad throttle position sensor a warning sign?
Engine won’t idle smoothly, idles too slowly, or stalls If you start to experience engine misfires, stalling, or rough idling when the car is stopped, it can also be a warning sign of a failing TPS. You don’t want to wait to get this checked out!
Do you need to adjust the throttle stop screw?
On a 100% factory stock engine, you should never need to adjust the throttle stop screw. This is the reason why GM installs a tamper-proof plug over the throttle stop screw on the throttle body. But there are times when the adjustment of this screw is necessary.
You may see that this reading never reaches 0%, and in some cases does not also reach 100%. There are a few reasons for this: The reading is relative. 13% on the potentiometer may be fully ‘closed’ in terms of throttle.
If the voltage you get is not within spec, loosen the TPS retaining screws and adjust as necessary. Normal voltage reading for wide open throttle (WOT) is above 4.00 volts. There are trouble codes that are associated with the TPS. One code will set if the TPS voltage is too high when the computer expects to see it lower.
Engine won’t idle smoothly, idles too slowly, or stalls If you start to experience engine misfires, stalling, or rough idling when the car is stopped, it can also be a warning sign of a failing TPS. You don’t want to wait to get this checked out!
On a 100% factory stock engine, you should never need to adjust the throttle stop screw. This is the reason why GM installs a tamper-proof plug over the throttle stop screw on the throttle body. But there are times when the adjustment of this screw is necessary.
Can bad TPS cause high idle?
When a TPS goes bad, then the car’s throttle body won’t function properly. It could either stay shut or it won’t close properly which is a severe issue. When the throttle gets stuck in an open position than your vehicle will receive too much air and cause it to have a high or fluctuating idle.
Is the throttle position sensor reading 19% at idle?
The only thing inaccurate is the idle reading. (I haven’t tried going WOT to see if it goes to 100% properly but will do that this afternoon.) Drivability is fine for the most part, although the engine sometimes feels like it has a misfire at idle.
Can a bad throttle position sensor cause stalling?
Similarly, if your engine struggles to idle efficiently, it could also be a result of a damaged throttle position sensor. Stalling, surging, or hesitating while idling all can be caused by this unassuming sensor. The best way to determine if these issues are caused by your throttle position sensor is to go to the source.
What does the TPS read at idle on a predator?
I checked the TPS voltage using my Predator. At idle, it reads 1.4v and at WOT it reads 4.65v. I then took the TPS off of the throttle body. At the lowest setting, it was at 0.4v and at the highest it was still at 4.65v. So the high end is fine but the idle is definitely off.
How does the dashpot affect the idle speed?
The dashpot function controls the amount of airflow at closed throttle. At higher speeds more air is allowed through the engine to control pumping losses and drag. The actual amount of dashpot airflow must be reduced over time for the engine to return to idle.