This is for the NSX guru's.
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TPS, throttle position sensor replacement and availablity? Hesitation
- Thread starter AdvansCPAP
- Start date
Check with SOS if they can recalibrate your TPS Sensor. Please let me know what you find out because my TPS Sensor needs to be recalibrated also.
Check out this page on their site. I know it's for the big bore throttle body service, but I'm sure they can just recalibrate it without boring it.
http://www.scienceofspeed.com/produ...ts/NSX/ScienceofSpeed/big_bore_throttle_body/
My TPS Sensor needs calibrating because I've swapped throttle bodies with my wife's NSX and I can feel the difference in power at the low end.
Check out this page on their site. I know it's for the big bore throttle body service, but I'm sure they can just recalibrate it without boring it.
http://www.scienceofspeed.com/produ...ts/NSX/ScienceofSpeed/big_bore_throttle_body/
My TPS Sensor needs calibrating because I've swapped throttle bodies with my wife's NSX and I can feel the difference in power at the low end.
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I know the feeling. I went through all the same steps as you did until I finally found the problem for me. It was a bad fuel pump for me.
I might not be a fuel pump problem for you, but how did you rule out the fuel delivery system. Did you replace all the various parts (fuel pump, FPR, fuel resister pack, fuel filter)? Did you put a gauge on the fuel filter and see if your fuel pressure is within specs?
The only other thing I did besides all the other things you tried was:
- reset ECU by removing clock fuse or unhook battery terminals
- swap ECU with a friend's ECU to see if it helps
- replace fuel fiter
- take out your throttle body and clean it. Take it out completely, not just spray cleaner into it with the air box hose removed.
- put double stacked anti-fouler plugs on your 02 sensors. I did this because I was running straight pipes and want to rule them out.
Before you go out and buy an new throttle body or send it out to get fixed, swap it out with your friend's throttle body.
I can take out mine, since my car is being worked on, and send it to you if you like. I've taken that thing out so many times, I can do it with my eyes close. The only tricky part is reinstalling the throttle cable. Or better yet, drive down here and I will do it for you.
I might not be a fuel pump problem for you, but how did you rule out the fuel delivery system. Did you replace all the various parts (fuel pump, FPR, fuel resister pack, fuel filter)? Did you put a gauge on the fuel filter and see if your fuel pressure is within specs?
The only other thing I did besides all the other things you tried was:
- reset ECU by removing clock fuse or unhook battery terminals
- swap ECU with a friend's ECU to see if it helps
- replace fuel fiter
- take out your throttle body and clean it. Take it out completely, not just spray cleaner into it with the air box hose removed.
- put double stacked anti-fouler plugs on your 02 sensors. I did this because I was running straight pipes and want to rule them out.
Before you go out and buy an new throttle body or send it out to get fixed, swap it out with your friend's throttle body.
I can take out mine, since my car is being worked on, and send it to you if you like. I've taken that thing out so many times, I can do it with my eyes close. The only tricky part is reinstalling the throttle cable. Or better yet, drive down here and I will do it for you.
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In that case, I can send you my throttle body that needs calibrating and you can do it for me.:biggrin: You can install it on your car and use it for a week or two to see if it solves your problem. Then ship it back.
My brother lives up there in OC. He picked up a bumper foam that I bought from you about a year ago. He comes down to San Diego about every other week. We can use him as our carrier.
My brother lives up there in OC. He picked up a bumper foam that I bought from you about a year ago. He comes down to San Diego about every other week. We can use him as our carrier.
The car has to have something to run on, even if it's just the MAP (did you check the MAP?) and crank angle, to figure out how much fuel is needed and when. The ECU gets a rough idea, and the open loop map adds extra for safety and uncertainty. The O2s are not critical, as they don't work at startup when cold anyway.
I wouldn't put money on the TPS being the cause just yet. If the TPS is the culprit it would probably be due to a local wear spot on the resistance strip. Hook it up to an old-school ohmmeter with a needle and slowly open and close the throttle plate. The needle should smoothly go from one extreme to the other, proportional to the movement of the plate. If there are any sudden jumps of the needle then you've found the problem. It should happen at the point where you see the problem. If not, I think you may have to keep looking. The MAP is tested in a similar way, except you need to apply a vacuum to the sensor.
I wouldn't put money on the TPS being the cause just yet. If the TPS is the culprit it would probably be due to a local wear spot on the resistance strip. Hook it up to an old-school ohmmeter with a needle and slowly open and close the throttle plate. The needle should smoothly go from one extreme to the other, proportional to the movement of the plate. If there are any sudden jumps of the needle then you've found the problem. It should happen at the point where you see the problem. If not, I think you may have to keep looking. The MAP is tested in a similar way, except you need to apply a vacuum to the sensor.
The good news is that you didn't spend any money on a new throttle body. The bad news is that you still haven't resolved the problem.
I feel for you buddy...I've been there. It took me over 5 months to figure out my problem.
I can send you up my ECU as well. It is a stock ECU, no chip. It's no problem at all since I stripped down my interior to put new carpet and seats. Let me know if you want me to send any other parts that you want to test.
Good Luck.
I feel for you buddy...I've been there. It took me over 5 months to figure out my problem.
I can send you up my ECU as well. It is a stock ECU, no chip. It's no problem at all since I stripped down my interior to put new carpet and seats. Let me know if you want me to send any other parts that you want to test.
Good Luck.
Could you please decribe your exact setup. When you mention AEM, I am not sure of the engine setup. Both mechanical and electrical.
Regards,
LarryB
Regards,
LarryB
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