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My 1990 buick lesabre won,t start when it gets hot had crank sensor replaced 2 yrs. ago also replaced maf sensor

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  • Contributor
  • 13 Answers

Try the temp sensor.

Posted on Sep 11, 2017

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Posted on Jan 02, 2017

  • 116 Answers

SOURCE: 1990 buick lesabre - 3.8

no u cannot bypass the sensors 1 hot and 2 signal wires. test the sensors if u got no spark from any coil and the sensors are good replace the ignition controlle modgule... the coils are mounted on top of it
dont forget to rate me

Posted on Dec 10, 2008

Papa Chan
  • 56 Answers

SOURCE: crank sensor

The crankshaft position sensor is located on the right side of the engine block.
moz-screenshot.jpgTypical DIS Crankshaft Sensor 41844070

Posted on Jan 04, 2009

honeymokey
  • 3113 Answers

SOURCE: 1990 Buick Lesabre keeps stalling

Check ecm for part number 1228253. If it has this number in it replace it with a 16198264. Gm had trouble with that ecm for a cutting off problem. Mine would stall driving down the road and when I would put it neutral it would start back up and not have any trouble for the rest of the day. You must set the tps with a volt meter or scan tool.

Posted on Apr 25, 2009

Murphybanton
  • 2004 Answers

SOURCE: need spark plug diagram for 1990 buick lesabre

Visit http://www.densoproducts.com

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Posted on Sep 02, 2009

MNfisherman
  • 11896 Answers

SOURCE: after changing fuel pump 2 days ago on my 97

You can test the MAF before replacing. It may be a problem with the circuit itself or just a fluke from another problem that is connected to this sensor.

There are two basic types of mass airflow sensors: hot wire and hot film. In the first type, a very thin wire (about 0.2 mm thick) is used as the heated element.
f27-31.gif Components of a hot wire-type mass airflow sensor. Courtesy of Ford Motor Company. The element temperature is set at 100° to 200°C above incoming air temperature. Each time the ignition switch is turned to the off position, the wire is heated to approximately 1,000°C for 1 second to burn off any accumulated dust and contaminants.
The second type uses a nickel foil sensor, which is kept 75°C above ambient air temperatures. It does not require a burn-off period and therefore is potentially longer lasting than the hot wire type.
A faulty MAF will cause driveability problems resulting from incorrect ignition timing and improper air/fuel ratios.
Vane-type MAF Sensors
A vane-type MAF sensor is found on many import and domestic vehicles with EFI. All intake air must flow through the sensor. Some MAF sensors are called volume air flow meters

  • Begin checking a vane-type MAF sensor by checking the voltage supply wire and the ground wire to the MAF module before checking the sensor voltage signal.
  • Always follow the recommended test procedure in the manufacturer's service manual and use the specifications supplied by the manufacturer.
  • Typically, to test the sensor, a digital multimeter (DMM) is used and set on a DC voltage scale. The negative meter lead is connected to ground and the red lead to the MAF signal wire.
f_32.44.gif A voltmeter connected to measure the signal from a MAF sensor. Reproduced with permission from Fluke Corporation.
  • Turn on the ignition switch and press the min/max button, if available, on the DMM.
  • Slowly push the MAF vane from the closed to the wide-open position, and allow the vane to slowly return to the closed position.
f_27.33.gif Move the MAF sensor air vane from open to close to test it. Reproduced with permission from Fluke Corporation.
  • Observe the maximum and minimum voltage readings as the vane was moved.
  • If the minimum voltage signal is zero, there may be an open circuit in the MAF sensor variable resistor.
  • When the voltage signal is not within the manufacturer's specifications, replace the sensor.
WARNING While pushing the mass air flow sensor vane open and closed, be careful not to mark or damage the vane or sensor housing.
  • Some vehicle manufacturers specify ohmmeter tests for the MAF sensor.
  • With the MAF sensor removed, connect the ohmmeter across the sensor's output and input terminals.
f_32.45.gif Ohmmeter connections to a MAF sensor. Reprinted with permission.
  • The resistance at these terminals is normally 200 to 600 ohms.
  • Connect the ohmmeter leads to the specified MAF sensor terminals, and move the vane from the fully closed to the fully open position.
  • With each specified meter connection and vane position, the ohmmeter should indicate the specified resistance.
f_32.46.gif Resistance specifications for a typical MAF sensor with door open and closed. Reprinted with permission.
  • When the ohmmeter leads are connected to the sensor's input and output terminals, the ohmmeter reading should increase smoothly as the sensor vane is opened and closed.
  • To check a vane-type MAF with a lab scope, connect the positive lead to the output signal terminal and the negative scope lead to a good ground.
  • This type MAF should display an analog voltage signal when the engine is accelerated. A defective MAF will have sudden and erratic voltage changes.
f_32.47.gif The trace of a defective vane-type MAF sensor. Reproduced with permission from Fluke Corporation. Hot-Wire-Type MAF Sensors
The test procedure for heated resistor and hot-wire MAF sensors varies depending on the vehicle make and year. Always follow the test procedure in the appropriate service manual. A frequency test may be performed on some MAF sensors, such as the AC Delco MAF on some General Motors' products.
  • To check the MAF sensor's voltage signal and frequency, connect a voltmeter across the MAF voltage signal wire and ground wire.
  • Start the engine and observe the voltmeter reading.
  • On some MAF sensors, this reading should be 2.5 volts.
  • Lightly tap the MAF sensor housing with a screwdriver handle and watch the voltmeter pointer.
  • If the pointer fluctuates or the engine misfires, replace the MAF sensor.
  • Some MAF sensors have experienced loose internal connections, which cause erratic voltage signals and engine misfiring and surging.
  • Set the DMM so that it can read the frequency of DC voltage.
  • With it still connected to the signal wire and ground, the meter should read about 30 Hz with the engine idling.
  • Now, increase the engine speed, and record the meter reading at various speeds.
  • Graph the frequency readings. The MAF sensor frequency should increase smoothly and gradually in relation to engine speed.
  • If the MAF sensor frequency reading is erratic, replace the sensor.
f_32..48.gif Satisfactory and unsatisfactory MAF sensor frequency readings. Reproduced with permission from Fluke Corporation.
  • When a scanner is used to diagnose a General Motors' vehicle, one test mode displays grams per second from the MAF sensor. This mode provides an accurate test of the MAF sensor.
  • The grams per second reading should be 4 to 7 with the engine idling.
  • This reading should gradually increase as the engine speed increases.
  • When the engine speed is constant, the grams-per-second reading should remain constant.
  • If the grams-per-second reading is erratic at a constant engine speed or if this reading varies when the sensor is tapped lightly, the sensor is defective.
  • A MAF sensor fault code may not be present with an erratic grams-per-second reading, but the erratic reading indicates a defective sensor.
  • Frequency-varying types of MAF sensors can be tested with a lab scope.
  • The waveform should appear as a series of square waves.
f_32.49.gif A normal trace for a frequency-varying MAF sensor. Courtesy of Progressive Diagnostics--WaveFile AutoPro.
  • When the engine speed and intake air flow increases, the frequency of the MAF sensor signals should increase smoothly and proportionately to the change in engine speed.
  • If the MAF or connecting wires is defective, the trace will show an erratic change in frequency.
f_32.50.gif The trace of a defective frequency-varying MAF sensor. Courtesy of EDGE Diagnostics Systems.

There is also a
Mass Air Flow (MAF) Burn-Off Module Operation:
00375_maf_burn_off_module.jpgA semi-conductor control for an electronic-ignition system.

Posted on Nov 17, 2009

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1 Answer

Where can I find the map sensor on a 1990 Buick Riviera 3800


You may not have one. If you have a Mass Air Flow sensor, very possible there is no map sensor.
I have a '92 LeSabre, and it does not have a map sensor, only the MAF sensor. I have seen a 2005 Buick Century that has both the MAF and a map sensor. On that one, the MAP sensor is on top of the intake manifold, on the passenger side of car.

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CarGurusJun 11, 2013 - It drives perfect then all of a sudden while im driving it stallsoccasionally. ... it idles ruff an stalls until it warms up does the same in gear its throwing engine ... If you are installing a idle air control valve in a 1990 Buick Centuryyou ... I put in my 3rd MAF sensor in 2 weeks and now the car is no longer stalling.

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1998 buick lesabre refuses to start or turnover until it sits awhile


Sounds like the starter to me(I assumed you meant won't crank when hot).I have replaced only 1 starter(on my neighbor's Taurus)in the 15 years after quitting the GM dealer tech job 15 years ago.I probably could make a career just changing GM starters and alternators.(I only have Mopars in my driveway!)

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Camshaft sensor


no but we can try it this way remove right front tire removefender inner liner once that is off you should be able to see it good luck later

Apr 01, 2009 | 1991 Buick LeSabre

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Jan 06, 2009 | 1990 Buick LeSabre

1 Answer

1990 Buick LeSabre cutting off, getting no spark, 30 mins starts


Replace crank sensor. Next time it cuts off pour or spray water on it, to cool it down and if car starts that is what it is. I did this to get my car home to fix it. Next thing I would look at is the coil module if crank sensor does not fix it.

Dec 21, 2008 | 1990 Buick LeSabre

1 Answer

1990 buick lesabre - 3.8 liter. won't start, it's not firing.Is there anyway to bypass the camshaft sensor or crankshaft sensor. And should the coil pack have 2 hot wires going to it with the ignition on...


no u cannot bypass the sensors 1 hot and 2 signal wires. test the sensors if u got no spark from any coil and the sensors are good replace the ignition controlle modgule... the coils are mounted on top of it
dont forget to rate me

Dec 10, 2008 | Buick LeSabre Cars & Trucks

9 Answers

Car shuts down while driving


It is very likely the part that is giving you the problem is a Crankshaft Position Sensor, they go open circuit when they get hot, then after it cools it becomes a good circuit again, this is very frustrating, had the same issue with my Buick a few years ago, replaced the coils and the ignition module at a cost of hundreds, DID NOT CHANGE A THING, the crank sensor fixed the problem and was $30.00 from Buick.

Oct 13, 2008 | 1997 Buick LeSabre

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