Question about 1989 Cadillac Sedan DeVille

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1989 DeVille,runs wide open like throttle stuck

Checked the tps with multimeter seems ok, dont no the exact values tho.
what else can i try ?

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The idle air control may be the culprit of your problem. They are threaded in on the intake plenum and are spring loaded with a pointed seat attached after the spring. If carboned up they will freeze into a position where it will not move. It should show a code if bad also. Auto Zone provide free dianogstics to see what codes pop up

Posted on May 25, 2009

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Clean the throttle body really good.

Posted on May 25, 2009


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1 Answer

Throtle gets stuck wide open i did tps worked for a day always pump to start runs ruff then goes bamm gets stuck wide open help me

You should not need to pump the throttle. That does not have any effect on starting the engine on a fuel injected car.
How do you un-stick the throttle ?

Dec 29, 2015 | 1999 Cadillac DeVille

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Only runs full throttle

Disconnect the MAF sensor and see if it changes rpm's. Pull off the big boot at the intake. Is the throttle valve wide open? If it is, the throttle body assembly needs cleaning-maybe it is stuck?
Have you scanned for trouble codes?

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Throttle stuck wide open

what make model year????? That would help everytime

Jan 08, 2013 | Chevrolet S 10 Cars & Trucks

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Ford Fiesta 1989. Starting problems

Hello! i would suspect the Carb fuel bowl vent level clearance..

Mechanical Fuel Bowl Vent Lever Clearance Adjustment

Secure the choke plate in the wide open position...
Turn ignition key to the ON position to activate the Throttle Position Sensor (TPS)... Open the throttle so that the TPS plunger extends fully.
Verify that the throttle is in the idle set position (contacting the TPS plunger)... Measure the clearance of the fuel bowl vent arm to the bowl vent actuating lever. ..Fuel bowl vent clearance (dimension A) should be 0.03 in. (0.76mm)...See diagram below...Guru...saailer


I’m happy to help further over the phone at

May 06, 2012 | Ford Cars & Trucks

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88 2.9 ranger sputters at 2500 to 3000 rpms when i drive it. it runs fine until i try to get on it or get into higher gear and rpms ut spits and sputters

If all plugs ,wires etc have been done, next i would confirm proper fuel pressure, then I would check throttle position sensor. An old analog ( with sweeping arm) multimeter on ohms, remove connector at TPS and connect to 2 of the pins on TPS .(throttle position sensor) Engine off, rotate throttle, or have someone push it from inside, slowly, gradually and needle of multimeter should sweep across as well, if not try different combination of 2 pins. When you find right combination that makes needle move when throttle pushed, observe the needle as someone pushes throttle slowly and steady from slow to wide open. If the needle jumps, or falls off and comes back up as throttle steadily pushed, then replace the TPS. If the needle slow and steady moves up /across and no stumbling, the TPS is probably ok. Make sure you test it a few times at least.

Feb 17, 2012 | 1988 Ford Ranger

1 Answer

Dont no my e codes definition on my 1993 cadillac deville i found codes E26,E32,E70,and E97 but I dont no what problems they represent

E26-shorted throttle signal switch
E32-open MAP sensor signal
E70-Intermittent TPS signal
E97-High RPM P/N to D/R Shift

some could be history codes not currents tho maybe try to clear then drive it and see what comes back.
Press off and high simultaneously to clear codes
and this link may help

Oct 06, 2011 | 1993 Cadillac DeVille

1 Answer

My 1993 cadillac deville feels as if the rpm's are running high (idle seems too high) the service engine soon light ocassionally comes on and I get the error code E30. Anybody have any ideas??

The error is indicating that the Throttle Position Sensor (TPS) is out of the normal range with respect to the Idle Speed Control (ISC). Try something really simple and inexpensive first by removing the air ducting between the air filter box and the throttle body. Clean the throttle body interior and throttle plate with a cloth sprayed with WD40. Turn the throttle plate by pushing it at the top with your fingers and clean the throttle throat behind the plate as best you can. Reassemble the ducting and ensure that there are no air leaks at the junctions and no splits. Turn the key to position 2 (engine not running) and depress the accelerator pedal to the floor and then back up again. Start the car and nine times out of ten that should fix it. The TPS measures the opening angle of the throttle plate. The TPS is device consisting of a circular carbon track with a slider, corresponding to the throttle plate, sweeping along it. It as three wires to it, two to provide the 0 to 5 volt range along the length of the carbon track and the third to measure the voltage at the contact point of the slider. To check the TPS measure the voltage of the middle pin of the connector when the ignition is at position 2 (engine off) as you push the throttle plate open and closed by pressing on the accelerator pedal. The voltage should alter in a smooth continuous way. Any drop outs of signal indicate a worn carbon track and the TPS should be replaced.

May 09, 2011 | 1993 Cadillac DeVille

1 Answer

Car starts has no power until the gas pedal is almost to the floor. In 2nd the tach is at 3500 rpm and won't shift until i let up on the gas. It also hesitates and is using more gas than usuall.

Check the TPS (Throttle position sensor) wire lead and replace the TPS if any signs of damage or failure.

The Throttle Position Sensor (TPS) is used to send input signals to the Powertrain Control Module (PCM) to indicate the current angle of the throttle blade.

This sensor is a variable resistor that has a 5 volt reference signal applied to it by the PCM. The TPS sends signals back to the PCM in the range of approximately 1 to 4 volts, depending upon the throttle shaft angle. The PCM uses these input voltages to determine the current position of the throttle.
The PCM uses the voltage signals from the TPS and other input sensors to determine the proper air/fuel mixture and ignition timing for certain operating conditions. Some of these operating conditions are: acceleration, deceleration, idle, and wide open throttle.

Typical Readings:
An input voltage of approximately 1 volt indicates a minimum throttle opening, idle, or deceleration condition. An input voltage of approximately 2 volts indicates a cruise or light acceleration condition. An input voltage of approximately 4 volts would indicate a maximum throttle opening or wide open throttle condition.
NOTE: The following procedure tests the TPS only.
  1. The TPS can be tested with an analog voltmeter. The center terminal of the TPS is the output terminal.
  2. With the ignition key in the ON position, check the TPS output voltage at the center terminal wire of the connector. Check this at idle (throttle plate closed), and at wide open throttle (WOT).
    • At idle, TPS output voltage should be approximately one volt. The output voltage should increase gradually as the throttle plate is slowly opened from idle to WOT.
    • At wide open throttle, TPS output should be approximately 4.5 volts.
As always, check the service manual for the proper procedures and specifications for your particular vehicle.

Thank you using Fixya and good luck.

Mar 08, 2010 | 2002 Oldsmobile Alero

1 Answer

TPS voltage readings

This requires a certain operation to set. If you really need to know reply and I can help.

Oct 13, 2008 | 1989 Cadillac Sedan DeVille

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