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Ron
Ron, ASE Certified Technician
Category: Mazda
Satisfied Customers: 33403
Experience:  35 years as a automotive tech
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What tps% does the throttle body open on 04 mazda rx8 cause

Customer Question

what tps% does the throttle body open on 04 mazda rx8 cause the throttle body done start to move till around 30-50% on the tps if it is failed shouldnt it throw a posistion code for the throttle body
Submitted: 1 year ago.
Category: Mazda
Expert:  Ron replied 1 year ago.

Hello and thank you for your question,

The TP voltage and percentage should start to move the minute you start to open the throttle. If its not then it may be bad but as you suspect, in most cases if there is a problem with the TP the computer will usually set and store a fault code and you will usually feel a hesitation. If you looking at this signal on your scanner then its likely a normal reading because on most scanners there is usually a few second delay streaming the data. If you are not having any symptoms then you likely do not have a problem.

Customer: replied 1 year ago.
yeah the voltage is good monitoring tp1 and tp2 but when having another tech step on the throttle slow and i watch the throttle body it dont move till around tp% is 30
Expert:  Ron replied 1 year ago.

What your seeing is very likely the normal reading because most scan tools have a sight delay in the streaming data on the scanner. If you not feeling any hesitations and or setting any fault codes then you do not have a bad sensor.

Customer: replied 1 year ago.
i dont think there is a issue with the tps but the throttle body it self i am out of the shop right now i i wont be able to call
Customer: replied 1 year ago.
the issue i think its having is the actual throttle body cause the car will not idle but it drives fine
Expert:  Ron replied 1 year ago.

Have you made sure the throttle body is clean and that there is no sludge build up?

Customer: replied 1 year ago.
with the maf sensor unplugged i can get it to idle but is rich as it would be but with it plugged in the ecm is trimming exessivly from .6 lambda to 1.4 lambda
Expert:  Ron replied 1 year ago.

Its normal for it to go rich with the MAF disconnected, are you sure your not dealing with an engine vacuum leak?

Customer: replied 1 year ago.
i have double checked all vacuumn lines the 4 going to the oil injectors the one from the isolter at primary injectors the one coming from the bottom of the lower intake and then the 3 vacuum valves the
Expert:  Ron replied 1 year ago.

Have you tried carefully spraying some short sputs of car cleaner in around the intake and TB area? Sure sounds like a leak to me if it will not idle.

Customer: replied 1 year ago.
i have not tryied that ill do that soon as i get back to my shop thanks
Expert:  Ron replied 1 year ago.

Your very welcome , just be sure to do it carefully staying away from any ignition source to avoid a fire.

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