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What gives on 1994 Town Car with a new throttle position sensor and the engine still races at idle?
Vlg277
A problem like this could related to the MAF sensor being dirty, or faulty. It requires a special tamperproof torx bit to get to the maf, and is a very fragile sensor, so be careful cleaning it, using q-tips and windex. Alternately, it could be the EEC (the computer) that is processing the information from the TPS or the MAF incorrectly. A junkyard should have an EEC for about 25-50 bucks - of course, who's to say that isn't broken, too.
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What is a throttle performance switch for an 87 corvette?
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1992 Nissan 240sx tps voltage settings?
Not my work here so ... * Checking the TPS and Adjusting the Idle TPS Testing and Adjustment The TPS is there to tell the ECU how hard you have your foot on the gas. It isn't there to adjust for the idle. It's a sensor. It does have some adjustment of it's own and we'll try to give our version of what our Factory Manual says (though we won't even come close to doing it justice): Throttle Sensor & Soft/Hard Idle Switch The Throttle Sensor responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the Throttle Valve position into output voltage, and emits the voltage signal to the ECU. In addition, the sensor detects the opening and closing speed of the Throttle Valve and feeds the voltage signal to the ECU. Idle position of the Throttle Valve is determined by the ECU receiving the signal from the Throttle Sensor. This system is called "Soft Idle Switch" and controls engine operation such as fuel cut. 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Start engine and warm up sufficiently.4. Measure output voltage of Throttle Sensor using voltmeter.5. Adjust by rotating Throttle Sensor body so that the output voltage is 0.45 - 0.55 volts.6. Tighten mounting bolts.7. Disconnect Throttle Sensor harness for a few seconds and then reconnect it. With the locking tab of the connector pointing up and looking at the back of the connector as the wires from the wire harness go into it, terminal #1 is the one on the LEFT. #2 is in the MIDDLE and #3 is on the RIGHT. Output voltage is measured across terminals #2 and #3 from the harness side of the connector. A&W Question: Do you know the procedure for checking out the TPS and adjusting the idle? Answer:For the full blown check, it has a few steps involving the ECU and it's connections to the TPS. We're going to skip those, assuming they aren't a factor. Also, trying to describe which terminal on the ECU harness to check would be a nightmare w/o a diagram. This is hard enough as it is! Checking for the correct voltage, ground circuit, and resistance are not that tough. So here ya' go... POWER SUPPLY: Disconnect the TPS harness and look at the terminal side of the connector. (this is the side with the terminal connectors in it) With the locking tab pointing UP, the terminals are A, B, and C, from left to right. (Confusing, huh?) This is measured from the male half of the connection that goes to the engine. Turn the ignition ON and measure the voltage between terminal C and ground. It should be approx. 5v. GROUND CIRCUIT: Ignition OFF. Check for continuity between terminal A and ground. Continuity should exist. RESISTANCE: Make sure that resistance between terminal A and B of the connector half (female) that goes to the TPS changes when opening the Throttle Valve manually. 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Clean your throttle body/throttle position sensor. By disconnecting your battery, you're forcing the computer into "re-learn"mode". After a few days, it thinks it's learned all it can. While learning, the computer runs the engine on several "default" values, ignoring some of the electronic signals being provided to it. Once it switches over to actually looking at some of the sensors, a bad sensor can stop the show. BUT, if your TPS is dirty, it's sending a confusing voltage signal to the computer. After a few days of erratic signals, it just gives up looking for the signal, and shuts you off.
1988 Toyota pickup what gives off the injector pulse?
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