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When we turn on the head lamps or turn on anything electrical it causes the idol to go up.

We replaced the tps, but it did not fix it.

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  • Cars & Trucks Master
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Um, that's kinda normal for the idle to bump up when the car's computer senses an extra draw on the electrical system

what you can do is to check the drive belt and make sure it's not overly stretched

or do a charging system test (free at a local autozone or advance auto parts store)

as well as a battery load test (also free from my local parts store)

how high of an idle is it bumping up to? tach reading?

Posted on Apr 05, 2015

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My 1985 Fiero is hard to start and when it starts it idols but when I put it in gear it goes dead ?? I put in a new Idol control valve and a new Throttle position sensor, I did notice when I put the TPS on...


try the fuel presure regulater it should be on the fuel rail ( that is if it is the V-6 ) it hasone vacum line on it and it has i think like 6 screws holding it in. it will cause just that same problem it will also cause it to flood at idle and foul plugs and make it idle rough you may have to chage the plugs also. you might check the vacum to. it should run on stright vacum from the intake.

Aug 20, 2011 | 1985 Pontiac Fiero

1 Answer

Changed the TPS on my 05 sedona and it reads P0122 code on scanner, after clearing the codes the check engine light wont turn off and the codes still reads P0122, maybe a bad TPS ?


this code may cause by:

TPS not mounted securely.

TPS circuit short to ground or another wire.

Faulty TPS.

Damaged computer (PCM).

to fix this code you can try this:


Carefully check the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace as necessary
Check the voltage at the TPS (refer to a service manual for your vehicle for specific information). If the voltage is too low that is indicative of a problem. Replace if necessary.
If recently replaced the TPS may need to be adjusted. On some vehicles the installation instructions call for the TPS to be properly aligned or adjusted, consult a repair manual for specifics.
If there are no symptoms at all, the problem may be intermittent and clearing the code may resolve the issue temporarily. If this is the case then you should definitely check the wiring to be sure it's not rubbing on anything, grounding, etc. The code may come back.

Aug 02, 2011 | 2005 Kia Sedona

1 Answer

1994 camry idols rough.was told it could be tps or coil pack check engine light was on and went off after we changed spark plugs but it still idols rough.what could this be?


Actually, in today's cars on the road, a check engine light can mean literally hundreds of different things on the engine or transmission.

I would have the car scanned to see what codes have been stored in the computer to get a clue as to what is wrong with the vehicle's engine.

A rough idle could be caused by a coil pack, a tps problem would be more like a miss on acceleration kind of symptom.

However, before changing expensive parts, it would probably pay to have the codes scanned.

Aug 29, 2010 | 1994 Toyota Camry

1 Answer

Idol very high 3000rpm possable idol sensor


throttle positioning sensor voltage should run around 1 volt at idle. If you unplug the sensor the car should still run on the presets in the computer, this will turn on the check engine light but if the RPM's drop down to normal replace the tps.

Jan 19, 2010 | 1999 Saturn SL

1 Answer

My idol sits around 100-300 RPM


your idle should be around 750 to 850 in park or neutral
i don't know how it even runs at the rpm you listed.
your vehicle should have a tps sensor
"throttle positioning sensor" you might have to have it reset

Nov 21, 2009 | 1995 Chevrolet K1500

1 Answer

Why is my grand 2004 grand cherochee idoling rough


The idle air control valve (IAC) may be stuck or failing. This solenoid-type device controls the airflow into the engine at idle. It is fed control input signals from the engine's computer. Over time, the IAC valve may become dirty from EGR gases and carbon, etc. It may have a worn pintle (valve head) or the return spring may be weak or broken, causing a rough idle or even stalling from an over-rich fuel/air mixture. The second thing to have checked is the throttle position sensor.TPS. These devices will "flag" a fault on your vehicle's onboard OBD-II computer, which a decent code reader/scanner can display and clear. Third, a dirty throttle body housing/venturi can cause rough idling and poor response. A special cleaner is needed to remove oil and carbon residues from the specially-coated inner surfaces of the throttle body. Fourth; you may have a Mass Airflow Sensor (MAF) that might be failing/malfunctioning. Some vehicles use these instead of the Manifold Absolute Pressure (MAP) Sensor, which you may have. These sensors need to be checked and verified that they are functioning properly. Fifth; check/change your vehicle's fuel filter, and verify proper/adequate fuel pump pressure and flow performance. Don't run your vehicle below 1/4 tank of fuel...doing this sharply reduces the life and cooling of the in-tank electric fuel pump. These are not cheap, or easy to replace!

Aug 31, 2009 | 2004 Jeep Grand Cherokee

2 Answers

Car wont idol but runs fine when pressing on gas pedal


either the tps is out of parameters or you need to adjust the idle up a bit

Apr 16, 2009 | Toyota Camry Cars & Trucks

1 Answer

T bird stalls on idol?


Check all vacuum lines and electric connections. It sounds like a Throttle position sensor or an EGR valve problem. If it idles too slow there are a few screws to turn like on the old carburetors. The vacuum routing is on a label and you may have the wrong hose somewhere.

Apr 13, 2009 | 1994 Ford Thunderbird

2 Answers

1997 ford ranger idol problems


MIGHT be the tps
The TPS is sensitive to heat, moisture and vibration leading to the failure of some units. The sensor is a sealed unit and cannot be repaired only replaced. A TPS may fail gradually leading to a number of symptoms which can include one or more of the following: -
  • Poor idle control: The TPS is used by the ECU to determine if the throttle is closed and the car should be using the Idle Air Control Valve exclusively for idle control. A fault TPS sensor can confuse the ECU causing the idle to be erratic or "hunting".
  • High Idle Speed: The TPS may report faulty values causing the engine idle speed to be increased above normal. This is normally found in conjunction with a slow engine return to idle speed symptom.
  • Slow engine return to idle: A failing TPS can report the minimum throttle position values incorrectly which can stop the engine entering idle mode when the throttle is closed. Normally when the throttle is closed the engine fuel injectors will be deactivated until a defined engine RPM speed is reached and the engine brought smoothly to idle speed. When failing a TPS will not report the throttle closed and fueling will continue causing the engine to return to idle very slowly.
  • Engine Hesitation on Throttle Application: The TPS is also used by the ECU to determine if the driver has applied the throttle quicker than the Manifold Air Pressure sensor can read. The fueling is adjusted acordingly to cope with the sudden increase in air volume, however a faulty sensor can cause the ECU to ignore this data and the engine will "hesitate" when applying the throttle. In extreme cases with the engine at idle, a sudden application of full throttle can stall the engine.
  • Engine Misfire: A fault TPS can report values outside the deined acceptable range causing the ECU to incorrectly fuel the engine. This is noticable as a slight misfire and can trigger the misfire detection software and/or Malfunction Indicator Lamp (MIL) light on the dashboard. Extreme cases can cause excessing misfires resulting in one or more cylinders being shut down to prevent engine and catalytic converter damage.
[edit] Manual recalibration In all cases a manual recalibration of the TPS may resolve the issues at least on a temporary basis. To recalibrate the TPS: -
  1. With the engine off, insert the key and turn the ignition to position 2 (On) without starting the engine.
  2. For MEMS-equipped cars (S1), quickly press and release the accelerator pedal several times (at least 5, but to be sure 8 or 9) using as much of the throttle travel as practicable. This will trigger the ECU into the closed-throttle reference learn algorithm, which has it looking for the lowest measured static throttle position (the closed position). The throttle position calibration is a fixed definition from this point.
  3. Turn the ignition off, remove the key and wait for the ECU to power down (about 30-40s).
  4. Start car as normal.

Feb 26, 2009 | 1996 Ford Explorer

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