Question about 2001 Hyundai Elantra

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The bucking is when u take off in the first few gears..its a 5 speed..it also idles up n down..it does give a tps code on the check engine light.i have replace3d the sensor and computer n tested wires as well as ran a jumper from my pcm to the sensor it self..nothing changes..any ideas????

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  • Hyundai Master
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Mass air flow sensor??is first thought and the idle control valve suspect??but try cleaning the erg valve

Posted on Dec 29, 2010

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95 Ford f150 5.0. When weather is cold takes several trys to get started and have to play with throttle to keep running. Barely runs till up to normal temps but rarely runs good. Idle surges and truck will...


the detonation (pinging) is an indication that the fuel/air mixture ratio is out ( lean) or the timing is wrong (too far advanced). The mixture is set by both the HO2S sensor and the O2 sensor so check them out for failure. If it is a V engine check out all 4 units. The timing may indicate a faulty ignition module so look in that area for the hard starting. There will be codes stored but you may have to get an expert to connect the data link correctly top get the CPU to read out Different systems, different leads ,different pin connections

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TPS faults and how to fix


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

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My 2005 volkswagen toureg ABS light is on as well as my check engine light. Also, it has been idling from .5 to 1 and back down to .5 with some shaking noted.


Idle speed should have nothing to do with ABS. Did both come on at same time?? Check engine light can be easily checked for code # at many parts stores. They will check for free. This code may give a hint to problem but need to get that code for check engine light to start with. Code will be 4 digit number. P03000, P0420 etc. Need code stored for solution to begin

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What happened to my info took me to heater switch????


Look up check for clogged cat on youtube. Could be a coil braking down.. could be a egr problem.. could be IGN Module.. DO not replace these things.. there are tests that can be run.. Orellys auto parts can test them for you.. If the "bucking" is ign related it should set a code for engine missfire. A long shhot is grounds for the fuel injectors..each injector has 2 wires.. one power from the computer and one ground.. there usually grounded somewhere on the intake manifold or firewall.

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1 Answer

Truck shifts out of gear at 50 to 60 miles an hour jumps in and out of overdrive at those speeds


check the tps ( throttle position sensor ). a bad tps causes transmission shift issues, bucking, jerking, idle surging, engine cutoff, hesitation on take off, surge while cruising down highway. am not saying this does the trick, but it is a good starting point. good-day !

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2 Answers

Tps code how to tell if tps is bad or if its something else


here are the symtoms of a tps, transmission shift issues, bucking, jerking, idle surging, engine cut off, hesitation on take off, surge while cruising down highway. have a good one!! most often the check engine light will be on. but not always.

Jun 24, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Wont switch gears tell at 5500 rpms


check out tps sensor it has a big effect on shifting of vehicle. The data provided by TPS is invaluable for proper startup, idle and easy throttle response of the car. These operations are affected when a bad throttle position sensor feeds erroneous data to the car's computer because of which the:
  • Engine malfunction indicator light (MIL) is turned on
  • The driver of a car experiences difficulty while changing gears.
  • The fuel economy of the car drops drastically.
  • Causes difficulty in setting base-ignition-timing of the car a bad tps causes transmission shift issues, bucking, jerking, idle surging, engine cut off, hesitation on take off, surge while cruising down highway. it may not be that but try another one and find out. you can test the tps, just unplug connector to it. use a ohms meter and hook one lead to the top and other to the center prongs on tps itself. next move throttle very slow, if good tps will move needle on ohms tester it will sweep up without cutting out. but if you perform this test and the needle hesitates at any time you move throttle plate it is bad. 1 is ground, 2 is signal, the prongs on tps. good-luck

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ENGINE SURGING COULD BE WEAK FUEL PUMP, STOPPED UP FUEL FILTER,BAD TORQUE CONVERTER SOLENOID OR TORQUE CONVERTER. OR FAULTY TPS.

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