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| Any TPS experts ('93 vert) here? | |
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| Tweet Topic Started: Nov 19 2009, 07:03 AM (1,013 Views) | |
| rmcelwee | Nov 19 2009, 07:03 AM Post #1 |
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I am tired of getting a crappy 49 MPG and will do some aero mods soon but I think I have a problem with the car somewhere else. I saw a post about adjusting your TPS (tps report?) when I first got the car. I did check my TPS with a volt meter and found that it could not be adjusted to the factory specs (it is probably broken). I'm wondering if that is hurting me at all. I can see on my MPGuino that the TPS knows when the throttle plate is closed and I would think that would be all the ECU needs to know about but maybe I am wrong. Does anyone know if this is something I actually need to fix? |
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| wikityler | Nov 19 2009, 02:31 PM Post #2 |
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Some say...
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If the ecu can detect when the throttle is closed, then it should have no effect on fuel economy. The only other function of the TPS is to detect WOT, assuming you have a manual. The auto's have a signal that varies with throttle position. Your car gets an epa rating of 35/41. I doubt there is any thing wrong with your car.
Edited by wikityler, Nov 19 2009, 02:32 PM.
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| Manny | Nov 19 2009, 03:51 PM Post #3 |
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Yes! a Costa Rican member
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Here's the thing: On a 97 model which has a OBD-II system, the TPS varies it's voltage from 0.50 to 4.0 v or so... so it actually affects your MPG. O2 sensor regulates the amount of air/fuel, however the TPS detects any change on throttle opening to understand you need to accelerate and pump more gasoline into the engine. TPS has too many cables and one of them is to detect the idle position, so the whole TPS is not just for that idle purpose. If you can't adjust to factory settings definitely something else is wrong and you need another one About the Metro 93, can't tell, but probably on that OBD-I system it does detect Idle or WOT condition, however does not make sense to me, I think regardles the year, it has something else to do as in many other cars I had an Integra 92, and TPS actually participate as well on Fuel economy, even when running OBD-0... the very first FI system remember regardles the make and model ODB rules are standard for al vehicles and something else to complain with |
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| Ghino | Nov 19 2009, 04:00 PM Post #4 |
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aero dynamic mods? on a Geo ? the only way i think is to create a carbon hardtop. for the rest there is no thing what you can feel much in difference.... spoilers? maybe if you try to get airborn
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| Bad Bent | Nov 19 2009, 04:25 PM Post #5 |
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Facetious Educated Donkey
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According to my '91 Service Manual M/T Manual Transmission. Has a Throttle Switch, looks like a box, 3 pin connector. The Throttle switch, consisting of 2-contact points (idle switch and wide open switch) is connected tothe throttle valve shaft on the RB, and detects the valve opening. The throttle opening in the idle state is detected by means fo the idle switch, and the wide open state is detected by the wide open switch. By monitoring their "ON"/"OFF" signals, ECM detects the throttle valve opening. TheECM uses the "ON"/"OFF" signals from throttle switch as on of the signals to control fuel injector, ISC solenoid valve, shift light and EGR VSV (fi equipped). Automatic Transmission: The TPS, looks like a lolly pop, consisting of a contact point (idle switch) and a potentiometer, is connected to the throttle valve shaft on the TB and detects the throttle valve opening. The throttle opening in the idle state is detected by means of the contact point which turns "ON" in that state. But beyond that the full opening is detected by the potentiometer as follows. A 5 volts reference voltage is applied to the sensor from the ECM and as its brush moves over the resistance according to the throttle valve opening, the output voltage varies accordingly. From what I'm seeing there are different styles of TPS' out there. By monitoring the "ON"/"OFF" signal and sensor output voltage, ECM detects the throttle valve opening. ECM uses the signal from the TPS as on of the signals to control fuel injector, ISC solenoid valve and EGR VSV (fi equipped). |
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| rmcelwee | Nov 20 2009, 03:52 AM Post #6 |
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35/41 is for a stock '93 vert. Mine has an econo cam, +10 sprocket, XFI tranny, and is only driven at 45 MPH. I should be doing better than what I am. I would think that I could get a stock '93 up to 49 by driving the way I do (no other mods). This week I hope to get started on the wheel skirts and radiator block (just have a plastic bag taped on it now). |
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2:06 PM Jul 11