Question about Buick LeSabre

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Hi, my fiances 2004 buick lesabre has been having issues with performance, and had stated that her tachometer had stopped wirking, but then gine was still running. however, upon acceleration; engine struggled and had even completlt died on her. I checked the codes a po336, po300, and two other for the knock sensor(po32something or other lol) had been reported. Having some repair backgroung, i replaced the crank sensor. Took car for test drive and still same problems stated earlier, at one point both the tach. and spedo stopped working, but engine still running and car driving. Not having access to a scan tool to reset codes for case relearn, i tried doing it old school hoping 336 was not a "hard" code. i disconnected neg batt terminal for appx. 15 mins, reconnected. mil was not on at this time, let engine idle for appx. 10 mins, mil did not come back on. took 4 test drive and all seemed well. no stuttering under throttle load, no check engine light (mil). appx 75 miles after this, was going around 55mphs and a slight stutter happend and tach stopped working. at this time, the engine was still running and car was driving fine, mil did not come on. I am stumped because ther is new plugs and wires, a new ignition module, fuel pressure is good, traced wiring from crank sensor as far as i could go, did not see any bad spots. I did not replace the cam sensor... Any ides lol???

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  • Buick Master
  • 12,207 Answers

You can't just change the crankshaft postion sensor an expect it to work correctly > Has to have
Crankshaft Position System Variation Learn done !
you need a factory scan tool Tech 2
Install a scan tool.
Monitor the powertrain control module for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List for the applicable DTC.
Select the crankshaft position variation learn procedure with a scan tool.
The scan tool instructs you to perform the following:
4.1. Accelerate to wide open throttle (WOT).
4.2. Release throttle when fuel cut-off occurs.
4.3. Observe fuel cut-off specification for applicable engine.
4.4. Engine should not accelerate beyond calibrated RPM value.
4.5. Release throttle immediately if value is exceeded.
4.6. Block drive wheels.
4.7. Set parking brake.
4.8. DO NOT apply brake pedal.
4.9. Cycle ignition from OFF to ON.
4.10. Apply and hold brake pedal.
4.11. Start and idle engine.
4.12. Turn A/C OFF.
4.13. Vehicle must remain in Park or Neutral.
4.14. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
• Crankshaft position (CKP) sensors activity--If there is a CKP sensor condition, refer to the applicable DTC.
• Camshaft position (CMP) signal activity--If there is a CMP signal condition, refer to the applicable DTC.
• Engine coolant temperature (ECT)--If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
Enable the crankshaft position system variation learn procedure with the scan tool and perform the following:
Important: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.

DTC P0336
No 18X reference pulses are received in one engine cycle, 720 degrees of crankshaft rotation.

Attempt to start the engine.
Does the engine start and run?
--
YES - Go to Step 3
NO - Go to Step 8
3
Observe the 18X Crank Sensor parameter with the scan tool.
Does the 18X Crank Sensor parameter change with engine speed?
--
YES - Go to Step 4
NO - Go to Step 5
4
Observe the Freeze Frame/Failure Records for this DTC.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Does the DTC fail this ignition?
--
YES - Go to Step 5
NO - Go to Testing for Intermittent Conditions and Poor Connections
5
Turn OFF the ignition.
Disconnect the ignition control module (ICM).
Turn ON the ignition, with the engine OFF.
Connect a test lamp to a good ground.
Probe the 18X reference medium resolution engine speed signal circuit at the ICM connector with the test lamp.
Does the test lamp illuminate?
--
YES - Go to Step 10
NO - Go to Step 6

6
Connect the test lamp to battery voltage.
Probe the 18X reference medium resolution engine speed signal circuit at the ICM connector with the test lamp.
Does the test lamp illuminate?
--
Yes - Go to Step 9
No - Go to Step 7
7
Observe the 18X Crank Sensor parameter with the scan tool.
Probe the 18X reference medium resolution engine speed signal circuit repeatedly at the ICM connector with the test lamp.
Does the 18X crank sensor RPM change?
--
Yes - Go to Step 13
NO - Go to Step 11
8
Disconnect the crankshaft position (CKP) sensor.
Turn ON the ignition, with the engine OFF.
Measure the voltage from the CKP sync signal circuit to a good ground with a DMM.
Is the voltage within the specified range?
4-8 V
Go to Step 14
Go to Step 12
9
Test the 18X reference medium resolution engine speed signal circuit between the ICM and the powertrain control module (PCM) for a short to ground. Refer to Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 20
Go to Step 19
10
Test the 18X reference medium resolution engine speed signal circuit between the ICM and the PCM for a short to voltage. Refer to Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 20
Go to Step 19
11
Test the 18X reference medium resolution engine speed signal circuit between the ICM and the PCM for an open. Refer to Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 20
Go to Step 16
12
Test the CKP sync signal circuit for an open. Refer to Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 20
Go to Step 15
13
Inspect for the following conditions:
• Incorrect harness routing near secondary ignition components
• The ignition coil arcing to the wiring harness or to the ICM
• The ignition coils for cracks, carbon tracking, or other signs of damage--Refer to Ignition Coil Replacement .
• Spark plug wires arcing--Refer to Spark Plug Wire Inspection .
Did you find and correct the condition?
--
Go to Step 20
Go to Step 15
14
Test for an intermittent or for poor connections at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections .
Did you find and correct the condition?
--
Go to Step 20
Go to Step 17
15
Test for an intermittent or for poor connections at the ICM. Refer to Testing for Intermittent Conditions and Poor Connections .
Did you find and correct the condition?
--
Go to Step 20
Go to Step 18
16
Test for poor connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections .
Did you find and correct the condition?
--
Go to Step 20
Go to Step 19
17
Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement .
Did you complete the replacement?
--
Go to Step 20
--
18
Replace the ICM. Refer to Ignition Control Module Replacement .
Did you complete the replacement?
--
Go to Step 20
--
19
Replace the PCM. Refer to Powertrain Control Module Replacement for replacement, setup, and programming.
Did you complete the replacement?
--
Go to Step 20
--
20
Clear the DTCs with a scan tool.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?
--
Go to Step 2
Go to Step 21
21
Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?
--
Go to Diagnostic Trouble Code (DTC) Types
System OK
P0300 is a random misfire !

Posted on Mar 01, 2017

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 321 Answers

SOURCE: buick lesabre nightmare

Need to get a scan tool and look at the data stream while it is running for alot more info.Also any trouble codes.Sounds like initially,the engine isn't getting any fuel.I would have a pressure gauge connected to the fuel rail on the engine,so i could monitor the fuel pressure while all this is going on.Items to look at on the data stream would be timing,what timing is the PCM commanding for the engine.Also,have you checked for continuos power feed to the coils during this no start condition,and fire at the plugs while cranking.You could possibly still have spark,but maybe it is extremely weak?I have seen bad ignition switches cause weird problems before too.Many things power up through the ignition switch,just a thought.Have also seen bad PCM's cause strange problems..38 volts is a little on the low side for GM.Usually see those at,at least .50 and up,and rise steadily while pressing the throttle,up to just under 5.0 volts.Potentiometer with 5 volt supply.Vacuum leak can be checked with engine running at a steady idle speed,spray brake cleaner all around the intake manifold and listen for engine speed change.

Posted on Jul 31, 2008

  • 255 Answers

SOURCE: buick lesabre no start

Hi you have replaced allmost everything ,(try fuel pump relay)

Posted on Aug 18, 2008

  • 40 Answers

SOURCE: 2000 Kia Spectra

http://www.kiatechinfo.com/index.asp

Good source for Kia its free to register NO STRINGS

Posted on Jun 01, 2009

shadtremonky
  • 353 Answers

SOURCE: Code 42 set on an '88 Camaro w TBI.Also very

listen to fuel pump w/ key on , if you hear a spraying sound, you may have a split hose in the tank

Posted on Jun 20, 2009

rafaelrs38
  • 12 Answers

SOURCE: 99 Toyota Corolla multiple misfire problem

This is what you need to do, change the plug wires, because if there is a bad wire you would definitely experiences sputter or a stutter, so do the plug wires and at the same time do the spark plugs, this should take care of your problem. if not let me know and i will give you the next step

Posted on Aug 11, 2009

Testimonial: "So far the car is working fine after I replaced the spark plugs and wires! Thanks so much!"

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