Throttle Position Sensor help
09-13-2012, 12:13 PM
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Throttle Position Sensor help
Ok so im in a little bind. i have a 05 rx8 shinka i started havent throttle problems about a month ago. now its so bad it gets to like 3000rpm and spudders the throttle wont go over 6000rpms then supdders down to 4500rpms the ode was a low circet throttle position sensor. how can i fix this without a replacing the throttle body and pedal please help!!!!!
09-13-2012, 12:18 PM
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Wrong subforum. Troubleshooting is more appropriate.
You are mixing terms that is making the problem more confusing. 6000rpm is a measure of engine speed, not throttle. If the engine is sputtering, then it's not a throttle problem but a spark, unstable air, or fuel problem. A throttle problem that didn't open the throttle the whole way would still be smooth, just slow acceleration. A code for the throttle position sensor might just mean that you need to clean the throttle body very well. Remove it and clean it thoroughly with carb cleaner.
The sputtering is going to be a different issue, but we need to get more info from you before we can give you a narrow set of suggestions. Only throw the book of corrections at you.
You are mixing terms that is making the problem more confusing. 6000rpm is a measure of engine speed, not throttle. If the engine is sputtering, then it's not a throttle problem but a spark, unstable air, or fuel problem. A throttle problem that didn't open the throttle the whole way would still be smooth, just slow acceleration. A code for the throttle position sensor might just mean that you need to clean the throttle body very well. Remove it and clean it thoroughly with carb cleaner.
The sputtering is going to be a different issue, but we need to get more info from you before we can give you a narrow set of suggestions. Only throw the book of corrections at you.
09-13-2012, 12:38 PM
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iv pulled the throttle body off and cleaned it very well. but the car acceleration is nothing pedal to the floor barley gets up to speed and every hill i go up i lose speed horribly.
09-13-2012, 12:39 PM
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More information? BE DETAILED! 
It sounds like you have 2 different issues here. Severe loss of power that bad is more often cat failure. And cat failure is usually from failed coils, plugs, and/or wires, which also kill performance.
It sounds like you have 2 different issues here. Severe loss of power that bad is more often cat failure. And cat failure is usually from failed coils, plugs, and/or wires, which also kill performance.
09-13-2012, 12:42 PM
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Ok when i take off into first it almost stales it i have to feather the gas just to take off. there is no acceleration at all its very very slow no matter if half throttle or whole throttle its the same but when it reaches 4000rpms it like jumps and jerks so i hold the cluth in and do just a rev and it will get to 6000rpms slowleys then stop and jump a little then bump down to 5000rpms and jump a little more its weird
09-13-2012, 12:43 PM
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https://www.rx8club.com/rx-8-discuss...t-here-202454/
Questions we CAN answer:
Most issues that the RX-8 faces are easily answered when you post detailed, descriptive, and accurate explanations of what symptoms you are having with your RX-8. Many of our issues share common symptoms with at least one other issue. Several of the really common issues share MOST of their symptoms with another problem. So when you post: "power loss?" We can't really tell you what is going on. We can only throw the book of possible issues at you for you to figure out.
The amount of assistance you receive is DIRECTLY associated to how much detail you provide!
So what do you need to share?
A) Break each issue you are seeing out by itself. For each of these issues, detail what RPMs it occurs in, and what RPMs it doesn't. Detail how much throttle you are giving when it occurs.
B) Detail what the ambient temperatures are that you are seeing, what the gauges are doing.
C) If you have a CEL, GIVE US THE CODE! (most auto-parts stores will pull the code for free for you. Otherwise, you can buy a code reader for LESS than the dealer's diagnostic price, giving you a discount on that one, and free code pulling for the rest of the device's life, across every car you own) (Hint, search with Google and site:rx8club.com <CEL> before posting. You will probably find your answer.)
D) Detail any possible modifications or repairs that have been made within the last 3,000 miles, even if it seems like it's not related.
E) Detail the age and mileage of the car, and what maintenance history it has been on. NOT just "it's gotten regular maintenance" because there are wear items that are not part of "regular maintenance" for dealers and most shops.
F) Since many issues are ignition related, and you are going to get asked, give us the mileage and age of ignition coils, wires, and plugs.
G) Detail out when it DOESN'T happen. This is just as critical as when it does!
Another thing to keep in mind is that unless you are being a complete jackass, and unless the person responding to you is ignorant about the issues, our answers are going to be pretty accurate, if not dead on. Even if you don't like the option. We have no stake in your finances, no stake in making money off of it. We DON'T like to see unhealthy or busted 8s. So if you choose to ignore our recommendations, do so at your own peril, and don't come whining to us that you shoveled money at the problem that was completely unneeded.
Most issues that the RX-8 faces are easily answered when you post detailed, descriptive, and accurate explanations of what symptoms you are having with your RX-8. Many of our issues share common symptoms with at least one other issue. Several of the really common issues share MOST of their symptoms with another problem. So when you post: "power loss?" We can't really tell you what is going on. We can only throw the book of possible issues at you for you to figure out.
The amount of assistance you receive is DIRECTLY associated to how much detail you provide!
So what do you need to share?
A) Break each issue you are seeing out by itself. For each of these issues, detail what RPMs it occurs in, and what RPMs it doesn't. Detail how much throttle you are giving when it occurs.
B) Detail what the ambient temperatures are that you are seeing, what the gauges are doing.
C) If you have a CEL, GIVE US THE CODE! (most auto-parts stores will pull the code for free for you. Otherwise, you can buy a code reader for LESS than the dealer's diagnostic price, giving you a discount on that one, and free code pulling for the rest of the device's life, across every car you own) (Hint, search with Google and site:rx8club.com <CEL> before posting. You will probably find your answer.)
D) Detail any possible modifications or repairs that have been made within the last 3,000 miles, even if it seems like it's not related.
E) Detail the age and mileage of the car, and what maintenance history it has been on. NOT just "it's gotten regular maintenance" because there are wear items that are not part of "regular maintenance" for dealers and most shops.
F) Since many issues are ignition related, and you are going to get asked, give us the mileage and age of ignition coils, wires, and plugs.
G) Detail out when it DOESN'T happen. This is just as critical as when it does!
Another thing to keep in mind is that unless you are being a complete jackass, and unless the person responding to you is ignorant about the issues, our answers are going to be pretty accurate, if not dead on. Even if you don't like the option. We have no stake in your finances, no stake in making money off of it. We DON'T like to see unhealthy or busted 8s. So if you choose to ignore our recommendations, do so at your own peril, and don't come whining to us that you shoveled money at the problem that was completely unneeded.
09-13-2012, 12:44 PM
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Ok when i take off into first it almost stales it i have to feather the gas just to take off. there is no acceleration at all its very very slow no matter if half throttle or whole throttle its the same but when it reaches 4000rpms it like jumps and jerks so i hold the cluth in and do just a rev and it will get to 6000rpms slowleys then stop and jump a little then bump down to 5000rpms and jump a little more its weird
09-13-2012, 01:45 PM
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Many reasons possible:
https://www.rx8club.com/tech-garage-...t-here-222280/
Without more information, I'm going to guess that you haven't replaced the coils, plugs, and wires when it needed it, and they have kept failing to the point that you can't get consistent combustion any more. Along the way, the excess unburnt air and fuel is getting dumped to the exhaust where it's igniting there, and that is blowtorching your cat and O2 sensors so that they are now failing as well. Possibly have already started into engine damage from this.
Cascading failures...
Perhaps this isn't the problem, but you aren't giving us enough to go on to really pinpoint anything.
https://www.rx8club.com/tech-garage-...t-here-222280/
Without more information, I'm going to guess that you haven't replaced the coils, plugs, and wires when it needed it, and they have kept failing to the point that you can't get consistent combustion any more. Along the way, the excess unburnt air and fuel is getting dumped to the exhaust where it's igniting there, and that is blowtorching your cat and O2 sensors so that they are now failing as well. Possibly have already started into engine damage from this.
Cascading failures...
Perhaps this isn't the problem, but you aren't giving us enough to go on to really pinpoint anything.
09-13-2012, 04:50 PM
#11
Use the google search feature ("site:rx8club.com <insert key word below here>"to look up the following things to check:
Clean ess (eccentric shaft sensor)
Clean MAF sensor
Check/ inspect cat converter
Coil tester
Change spark plugs.
As RIWWP stated, without more info, those are just guesses. That is why it is important to do research on your car (read the whole thread that RIWWP linked). That way, if something happens, you can do your own troubleshooting.
That google search feature should be used often...
Clean ess (eccentric shaft sensor)
Clean MAF sensor
Check/ inspect cat converter
Coil tester
Change spark plugs.
As RIWWP stated, without more info, those are just guesses. That is why it is important to do research on your car (read the whole thread that RIWWP linked). That way, if something happens, you can do your own troubleshooting.
That google search feature should be used often...
09-13-2012, 05:06 PM
#12
Ok so im in a little bind. i have a 05 rx8 shinka i started havent throttle problems about a month ago. now its so bad it gets to like 3000rpm and spudders the throttle wont go over 6000rpms then supdders down to 4500rpms the ode was a low circet throttle position sensor. how can i fix this without a replacing the throttle body and pedal please help!!!!!
This can be checked easily. Remove the Airbox and neck from the throttle body. Leave the throttle body intact and electrical connected. Your going to need a friend to watch or to operate the gas pedal.
Turn the ignition ON. Push down slowly on the accelerator pedal and watch the butterfly in the throttle body. Does it operate smoothly? Opening and closing? Vary the pedal operation and look for any skips or hesitations in the butterflies movement.It should be smooth opening and closing. This will verify if the issue is the throttle body or not.
We also need specifics on maintenance history. What and when and if items have been changed on the engine.
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