dist install 96 yukon

[crank.it]

hi folks -any insight on replacing a whole dist on a 96 gmc yukon...story is they are getting codes of dist gears worn???they want to replace the whole unit...hold down bolt and out it comes????or do i have to remove the whole motor???/ i beleive it a 5.7 ltr...thanks for any insight crank.it

[way2old]

The distributor can be replaced as always. Just mark reference points and remove. By any chance does it have a cam and crank correlation code? If so, you can use a scan tool and adjust the distributor to cure that.

[crank.it]

thank you mr.2old....notice how polite iam when I need to pick your vast knowledge bank....the cam sensor is in the dist so Iam gonna check on the colation...ive never heard of this code before...my little scan buddy will not allow such a recalibration of the cam and dist timing...ive gotta do more checking on this...but thanks for the green lite on the dist replacement....hey hows that other ol fart...give him a shout when ya talk at him thank you muchly...crank.it

[way2old]

If it is a correlation code, borrow a higher scan tool and adjust the timing to specs and it will go away.
This did not copy too well. If there is a yes, go to the first test it says to do. No is the second. Wish it showed better. Good luck.


1996 GMC Truck Yukon - 4WD | Chevy Pickup, GMC Pickup, Suburban, Tahoe, Yukon (VIN C/K) Service Manual | Engine | Engine Controls - 5.0L, 5.7L, and 7.4L

DTC P1345 Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation



Circuit Description
This DTC determines if the distributor is installed incorrectly, or if there is a mechanical malfunction in the engine. The DTC P1345 is a type A DTC.

Conditions for Setting the DTC
When the engine is running, the cam sensor reference pulse is not detected at the correct relative position to the crankshaft position sensor pulse.

Action Taken When The DTC Sets
• The VCM turns the MIL ON when this DTC is reported and one failure has occurred.

• The VCM records the operating conditions at the time the Diagnostic Fails. Freeze Frame and Failure Records store this information.

Conditions for Clearing the MIL/DTC
The VCM turns OFF the MIL after 3 consecutive driving trips without a fault condition present. A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (the coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle) or the scan tool clearing feature has been used.

Diagnostic Aids
Check the following items:

• A loose or missing distributor hold down bolt

• A loose CMP sensor causing a variance in the sensor signal

• Incorrectly installed distributor - 1 tooth off in either advanced or retard positions

• A loose distributor rotor on the distributor shaft

• Excessive free play in the timing chain and gear assembly

Test Description
The numbers below refer to the step numbers in the table.

4.This test will determine if the DTC is intermittent.

5.When the engine speed is raised to 2000 RPM the camshaft retard offset should not vary more than 2°.

6.If excessive pressure is used when performing this test unintentional damage to the distributor shaft could result.

7.If the distributor is one tooth off in either the advanced or retard positions the vehicle may run but 0° camshaft retard will not be obtained.

8.If 0° cannot be obtained during this procedure refer to Diagnostic Aids.

Step
Action
Value(s)
Yes
No

1
Important: Before clearing DTCs, use the scan tool in order to record the freeze frame and the failure records for reference because the Clear Info function will lose the data.

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
--
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check

2
•Install the scan tool.
•Start the engine.
•Using the scan tool monitor the engine RPM.
Does the engine RPM fluctuate (up to twice desired RPM)?
--
Go to Step 3 YES
Go to Step 4 NO

3
Replace the Crankshaft sensor. Refer to Crankshaft Position Sensor Replacement .

Is the action complete?
--
Go to Step 10 YES
--

4
Perform the Camshaft Retard Offset test procedure as follows:

•Install the scan tool.
•Start the engine
Important: The camshaft retard reading will not be accurate below 1000 RPM.

•Raise the engine speed to the first specified value.
•Monitor the camshaft retard with the scan tool.
Is the camshaft retard reading within the second specified value?
1000 RPM

-2°-2°
Go to Step 5 YES
Go to Step 6 NO

5
•Note the camshaft retard reading from the previous step.
•Raise the engine speed to the first specified value.
Does the camshaft retard reading change more than the second specified value?
2000 RPM

2°
Go to Step 6 YES
Go to Diagnostic Aids NO

6
With the engine at operating temperature perform the following procedure:

•Remove the distributor cap.
•Grasp the distributor rotor and gently attempt to rotate the rotor.
Does the rotor turn on the distributor shaft?
--
Go to Step 9 YES
Go to Step 7 NO

7
Check for proper installation of the Distributor. Repair as necessary.

Was a problem found?
--
Go to Step 10 YES
Go to Step 8 NO

8
Perform the Camshaft Retard Offset adjustment procedure as follows:

•With the engine OFF slightly loosen the distributor hold down bolt.
•Start the engine and raise the engine speed to 1000 RPM.
•Using the scan tool monitor the camshaft retard offset.
•Rotate the distributor as follows:
• To compensate for a negative reading rotate the distributor in the counterclockwise direction.

• To compensate for a positive reading rotate the distributor in the clockwise direction.

•Repeat step 4 until 0° offset is obtained.
•When 0° has been obtained turn OFF the ignition and tighten the distributor hold down bolt.
Did you obtain 0° camshaft retard?
--
Go to Step 10 YES
Go to Diagnostic Aids NO

9
Replace the distributor.

Is the action complete? YES
--
Go to Step 10
--

10
•Using the scan tool, select the DTC and the Clear Info.
•Start the Engine.
•Idle at the normal operating temperature.
•Select the DTC and the Specific.
•Enter the DTC number which was set.
•Operate the vehicle within the conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic ran and passed?
--
Go to Step 11 YES
Go to Step 2 NO

11
Using the scan tool, select the Capture Info and the Review Info.

Are any DTCs displayed that have not been diagnosed?
--
Go to The Applicable DTC Table YES
System OK NO

[crank.it]

thanks again ol wiser one :lol: :lol: 8) 8) 8) crank.it