When i back off the throttle at about 80 and apply it again it feels like its goin to stall and its idlin really low and has stalled twice it is an auto it has been on the computer and says it has lowvoltage on the tps and when i'm holdin a speed the rev needle moves up and down a bit and its like missin a bit
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1.3b) TPS Throttle Position Sensor faultsSymptoms of faulty TPS: Associated OBD2 error codes DTCs: P0121 - P0123
Poor starting:The engine may start and then stall immediately.The engine may be encouraged to keep running by slowly pressing the accelerator pedal: pressing too quickly may again stall the engine.
Erratic/fast idling:The idle may be so erratic as to have some impact on the automatic gear shift characteristics and may actually prevent gear shifts.The engine idle speed may be increased above normal if the TPS fails to report that the throttle is closed.After the engine has been run at high speed the engine may take longer than is usual to return to idle as the ECU will not be able determine how quickly to shorten the injector cycles.
Engine hesitancy/ jump in revs: Engine may fail to respond quickly to the accelerator pedal input or may suddenly jump in revs inappropriate to pedal movement. When working properly the TPS should instantaneously signal the rapidly opened throttle position to the ECU.The speed of this signal is much quicker than any similar signal sent from Manifold Air Pressure (MAP) sensor or MAF/IATequivalent. The ECU responds by increasing the fuel injection volumes to match the rapid increase in air volume.If the TPS fails to send the correct signals, the engine will seem to "hesitate" as the throttle is applied as the ECU looks to the other (slower) sensors to determine engine status.A sudden blip of the accelerator at idle can stall the engine (see above - poor start) as the ECU reacts too slowly to increase the injection time to match the sudden intake of air.
Engine Misfire:Spurious, beyond normal range, signals from the TPS causes the ECU to set inappropriate fuel injection cycles resulting in misfire.Detected misfire leads to a check engine light(CEL); mal-function indicator lamp (MIL). Cylinders with misfire events detected by the knock sensor may be shut down (disable specific injectors) by the ECU to prevent engine damage.
Note: - With the TPS disconnected the ECU depends on the slower signals it receives from the Mass Air Sensor (MAS) and/or the Manifold Air Pressure (MAP) sensor along with feedback from the oxygen sensor to help regulate engine speed and fuel injection cycle. How to check?The socket for electrical connection with the TPS has 3 pins, one for 'ground', one for 5 volts 'reference' and a third (generally the middle one) for 'signal' output. Back probe the signal pin in the connector to the TPS.Attach the positive lead of a voltmeter to the probe and measure the voltage output as the throttle plate is rotated. If working correctly the meter should show a voltage consistent with the throttle position from approximately 1 volt when closed and 5 volts when fully open.What is looked for is smooth voltage increase with throttle change.If there are drop outs in the throttle transition voltage signal or if there is no transition then the TPS is faulty. How to fix?If the track is dirty causing drop outs, try cleaning it with residue-free electrical cleaningspray.If the track is worn it is perhaps easiest toreplace the complete device.In some instances it may be possible to adjust the location of the central mount of the TPS contact arm along the throttle shaft by a few millimeters and in the process cause a fresh concentric region of track to be used NEXT 1.4) Idle Air/speed control valve
Have you consider to check the battery power. I believe the main problem you have is either the battery or the alternator. Due to these two things with low voltage the brain ( ECU ) does not have the enough power to work. Good Luck.
Have you had it to a shop that has a professional type scan tool that can view engine sensor data parameters ? Do you know what those are ? Idle air control counts , mass air flow sensor data , MAP sensor , TPS - throttle position sensor , crankshaft position sensors , Cam sensors , engine coolant temp , intake air temp etc......
"TPS" is your throttle position sensor located on the right side of your throttle body (if you are facing your engine) the function of the tps is to send imput to your pcm (power control module) by the movement of the throttle plate at idle/part throttle/wide open. the pcm will adjust air/fuel mix/egr functio/timing of spark based on tps imput by way of voltage signals. you can check for a bad tps sensor by using a voltmeter and back probing the tps connector. there are 3 wires with the connector tange facing up, the 3 wires are sensor ground (the wire closest to you) the middle wire is the sensor signal wire and the wire furthest away from you is the 5v supply wire. turn ign key to "on" (do not start engine) voltage should be between 0.2-1.4v with probes still inserted into the plug, slowly turn throttle pulley toward wide open throttle, youe readings should slowly rise to about 4.5v - IF NO VOLTAGE PRESENT- check wiring harness for supply voltage (around 5v) ground (0.3v) if both supply voltage and ground voltage present AND no output voltage tps FAULTY TPS. remove/replace tps. if voltage values exist, but are less than what they should be, look for problem with wiring harness, or bad pcm. my other thoughts are partially plugged fuel filter/pressure sensor, or a vacuum leak gremlin somewhere.
First of all don't go looking for a distributor cause that car does not have one. It has a coilpack that is triggered by the ignition module wich sits underneath the coilpack on the front of the engine on the right side with all the plug wires goin to it. mcmuff- this is a D.I.S. system. That means: Distributorless Ignition Sytem.
It is really hard to check the module cause unless you work for the dealer like i did back then, you can't get the test perameters you need. the primary voltage from the module is arround 1100 volts.The secondary voltage from the coil is 30,000 so be carefull!!
My guess is a bad crank sensor wich like mcmuff is thinking , is vonerable to heat soaking like a module or coil in a conventional distributor system. It is not easy to test these either. Its dangerous but the best way of checking the crank sensor is to tap it with a long (24") screwdriver. tap it rapidly but not so hard you move it in it's bracket. If the car stalls or stumbles it is the crank sensor. The crank sensor tells the pcm and module when to fire the injectors and plugs with some help from the cam sensor to synchronize them. The cam sensor WILL NOT make the car stall if it goes bad.
I'll keep an eye out for ya for any more questions if ya need.Good luck........Scott