Question about 1998 Ford Taurus

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Ater warm up vehicle will run fine for about 20 to 30 miles. Then speedometer drops to zero miles, engine still runs at RPM but transmission quits pulling.. After a short time speedometer returns, trans pulls again. This continoues.

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Hav car scanned at a discount place--there r some bad codes-acuators,sensors or wiring has issues

Posted on Nov 02, 2010


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Why does it idle at 2,500-3,000 rpm then drop to 1,000 rpm in drive or reverse?

Hi Paul:
Here are my random observations:
- 2500 to 3000 is really high for "idle"
- Putting it into drive or reverse engages the transmission and puts load on the engine through the torque converter. Since the RPM is high enough that the vehicle thinks it should be moving, the transmission will engage and rpm will drop since more power is needed.
What to do? How long since tuneup?
History? Did this just start immediately, or did it sneak up a bit at a time.
Make, model, engine, year, Kms or miles. Give us some info and someone who is a better transmission specialist will probably kave some more ideas.

Feb 28, 2016 | Cars & Trucks

1 Answer

Our 1999 Buick century is having problems with running it won't hardly take gas and the transmission won't shift up sometimes the same time the transmission messed up the speedometer quit working

Is the check engine light on ? Have checked for codes , may have transmission codes stored . Check engine light doesn't need to be on for codes to be stored . VSS - vehicle speed sensor is a input to PCM.
The Vehicle Speed Sensor (VSS) is a gear-driven permanent magnet generator housed in the transaxle. The sensor generates a sine wave output with a frequency proportional to the vehicle speed. The Powertrain Control Module (PCM) converts the signal to an output that switches to ground at a frequency of 4000 pulses per mile. The signal (CKT 817) is used by various vehicle components. The signal CKT 817 drives the following components:
• The speedometer
• The odometer May also have problems with mass air flow sensor , crankshaft position sensor , cam sensor etc...
DTC P0336 Crankshaft Position (CKP) Sensor Circuit
The 24X reference signal is used to improve idle spark control at low engine speeds. The PCM uses the 24X reference signal to calculate engine RPM and crankshaft position at engine speeds below 1600 RPM. The PCM constantly monitors the number of pulses on the 24X reference circuit and compares the number of 24X reference pulses to the number of 3X reference pulses and CAM signal pulses being received. If the PCM receives an incorrect number of pulses on the 24X reference circuit, DTC P0336 will set and the PCM will use the 3X reference signal circuit for fuel and ignition control. The engine will continue to start and run using the 3X reference and CAM signals only.
There are a lot of electronic thing's on you Buick that can go haywire causing the problems you have . If you are unfamiliar with these thing's I mentioned , I suggest you take it to a ASE certified repair shop . Some people get irate just mentioning this, It mite save you money in the long run .

Feb 12, 2016 | Buick Cars & Trucks

1 Answer

93 mustang 50v8 engine what causes engine to quit running at high rpm then restarts as rpm falls

So is this the only issue your having? Is the stang hard to start cold or warm? Hard to say with what youve asked....Is your TFI newer how about your Dizzy?

Jul 01, 2014 | 1993 Ford Mustang

1 Answer

Whats wrong with Helen?

The speed sensor might be bad. I used to own a 99 Mitsubishi Eclipse with the same symptons. The car will start, but will not pass the 1st or 2nd gear, the speedometer will be at 0. I replaced the speed sensor and all the problems went away.

Apr 29, 2014 | 1995 Honda Civic

1 Answer

I have a 1996 Honda Accord with 268k miles that sputters at the same timethe speedometer needle fluctuates wildly. But I do have a new Vehicle Speed Sensor. This typically only happens when the engin

I am no Honda expert, but a similar problem happened to my ex sister in-laws Ford Taurus. The speed odometer would jump around and it had trouble shifting (automatic transmission). After driving it I changed out the speed odometer sensor on the transmission and it's been fine ever since. I changed out the sensor because if the cars computer cannot tell how fast the car is traveling then fail safes in place go into effect and the computer will do it's best to keep the cars rpm's down based on the speed indicator and not let it shift or shift properly either. If it's getting false speeds then it will shut down the motor when the speed gets to high and allow it to run as the speeds fall (jumping speed odometer needle). It effects the transmission shift points also. It will either shift erratically or not shift out of say 2nd gear, so that the cars engine can't get damaged based on what signal the speed sensor is sending the computer.

Jan 23, 2014 | 1996 Honda Accord

1 Answer

Problem with transmission. I am going to try to be VERY specific so you can help me with the best possible scenario. The truck has 232,000 miles. It has not been worked on very much. It has pulled a...

Cheapest scenario is to change the transmission filter. That is if it is an automatic. When you do this, most transmissions have a magnet in the transmission pan. If yours has one I would check it for excessive metal shavings or worse metal chunks.

Jul 25, 2011 | 1995 Chevrolet Tahoe

1 Answer

Speedometer quit working. 80,000 miles needle

Your speedometer is fully electric and the sensor at the transmission side is not sending pulse to the computer ECU.

The part is call Vehicle Speed Sensor (VSS).

There are two versions.

16 bolts and 17 bolts transmission pan version.

Count the number of bolts on your transmission pan before you head for the part store.

Please rate my answer if it's useful to you.



Dec 11, 2009 | 2003 GMC Sierra 1500

1 Answer

Oil pressure drops to zero after warmed up or below 2700 RPM

Check the oil pressure with a test guage, if the finding are the same, the look at your oil filter, pump, pickup, or pressure relief valve.....

Jul 18, 2009 | 2002 Isuzu Rodeo

2 Answers

Chrysler Concorde 1998 dies on idle

Speedometer quit working-consider vehicle speed sensor.

Apr 09, 2009 | 1998 Chrysler Concorde

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