Question about 1998 GMC Sierra

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How to set timing on 1998 gmc sierra - 1998 GMC Sierra

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  • rxnolivo May 09, 2010

    how to set the timming on a gmc 1500 v6 without a timming light? What are the symptoms?

  • rxnolivo May 09, 2010

    My truck idles roughly, then idles fast, then back to roughly. It will shut off immediatley when the accelerator is pushed, only stays on when idling?

  • rxnolivo May 09, 2010

    My truck idles roughly, then idles fast, then back to roughly. It will shut off immediatley when the accelerator is pushed, only stays on when idling?

  • gwgsr May 11, 2010

    need to know engine size

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2 Answers

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The v-8's timing is supposed to be 0 degrees plus or minus 2 degrees and is only adjustable if you have a scanner. A timing light does not work on them.
These engines can be "timed" in the way you are used too.
The distibutor housing holds the cam sensor, The PCM calculates the timing by measuring the crank signal and the cam signal.

What you are seting by turning the distibutor housing is the correlation between the 2 sensors. On the V-6 model, the housing holddown bracket is fixed to the housing so if you return the rotor to the proper position when reinstalling the housing, the engine should be at the correct cam sensor position setting.they did not fix the holddown bracket to the V-8 models, it would have saved a lot of headaches.
To set the correlation between the 2, you will need a scan tool that can read camshaft position offset. With the engine RPM over 1200 adjust the offset too 0 degrees.
TEST PROCEDURE
The ignition timing cannot be adjusted. The distributor may need adjusting to prevent crossfire. To insure proper alignment of the distributor, perform the following:

With the ignition OFF, install a scan tool to the DLC.
Start the engine and bring to normal operating temperature. IMPORTANT: Cam ****** Offset reading will not be accurate below 1000 RPM.
Increase engine speed to 1000 RPM.
Monitor the Cam ****** Offset.
If the Cam ****** indicates a value of 0°+/-2°, the distributor is properly adjusted.
If the Cam ****** does not indicate 0°+/-2°, the distributor must be adjusted.

ADJUSTING PROCEDURE
With the engine OFF, slightly loosen the distributor hold down bolt. IMPORTANT: Cam ****** Offset reading will not be accurate below 1000 RPM.
Start the engine and raise engine speed to 1000 RPM.
Using a scan tool monitor Cam ****** Offset.
Rotate the distributor as follows:
4.1. To compensate for a negative reading, rotate the distributor in the counterclockwise direction.
4.2. To compensate for a positive reading, rotate the distributor in the clockwise direction.

Repeat step 4 until 0°+/-2°, is obtained.
Turn the ignition OFF.
Tighten the distributor hold-down bolt to 3 Nm (25 lb. ft.).
Start the engine, raise engine speed to 1000 RPM and recheck Camshaft ****** Offset.

Thank you for using fixya and good luck.

Posted on May 09, 2010

  • Harvey N Tawatao
    Harvey N Tawatao May 10, 2010

    The 4.3 V6 Vortec is timed the same way as mentioned earlier. This is fine for a new engine but a non adjustable disributor on an older engine, I think would cause some trouble. The timing chain stretches, the disributor shaft wears, gear wear causes the timing "correlation" to slowly drift. I just checked a v-6 with 200,000 on it and the cam ****** was off -16 degrees.


    Putting a distributor cap with brass contacts on a 4.3 helps with misfires and the 5.0 and 5.7's have had some problems with distributor gear wear. It could be a possibility on your 4.3 but I haven't heard of it being a problem. You may want to check for slop in the distributor since there is quite a bit of plastic and the bushings could be worn.


    With the engine OFF, slightly loosen the distributor hold down bolt. IMPORTANT: Cam ****** Offset reading will not be accurate below 1000 RPM.


    Start the engine and raise engine speed to 1000 RPM.
    Using a scan tool monitor Cam ****** Offset. Is Cam ****** Offset the same as spark advance????






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If service engine light is not on, don't change timing it is ok

Posted on May 10, 2010

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SOURCE: removal of power steering pump on 1998 GMC Sierra 1500

you need a power steering pump puller the rest is simple any trouble let me know

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SOURCE: 1998 GMC Sierra radio and display stays on all the time

First of all...does your truck have the retained accessory power (RAP)? If it does, the radio would always stay on with the key off until you open the drivers door. If it does have RAP and the door pin on the drivers door has went bad, then the truck doesn't know that you opened the door and continues to allow accessory power (although it would still cut off after about 20 minutes). If the interior lights come on when you open the door, then the pin is ok. If the lights come on, it could be the RAP relay. If it has gone bad, it is possible it is stuck supplying power and needs replacing. The relay should be labeled in the fuse panel, and there should be other relays in the panel with the same part number. You can swap a relay for the RAP relay and see if it fixes the problem...if it does fix it swap the relays back and replace the RAP relay. If the truck doesn't have RAP then it is possible the problem is in the radio..if you have a friend with a GM car or truck close to the same year you could swap radios and see if that fixes your problem...should be pretty simple. pull the cover off the dash, it just clips on, take out a couple screws that hold in the radio, unplug it and plug in the other radio. sorry so long winded...hope this helps you somewhat.

Posted on Mar 13, 2009

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SOURCE: presure oil with my 1998 gmc sierra

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SOURCE: How do you set the timing on a 1998 GMC Sierra?

The timing is not adjustable and it is computer controlled, but the distributor must still be clocked in properly and static timed, and here is how it is done.

There is a mark or notch on the distributor housing that the rotor should be pointing to when the engine is on top dead center. This static timing is all that matters and the computer will be able to control the timing as long as the ignition rotor is in that position when the engine is at top dead center.

1. Place the engine at top dead center.

2. Look under the distributor cap and find where the number one terminal runs under the distributor cap, and where that position on the distributor cap corresponds with the distributor housing, and it should match up to a mark or a notch on the distributor housing.

3. With the engine on top dead center the ignition rotor should be pointing to the mark or notch that is on the distributor housing, if it is not then loosen up the distributor and turn the distributor until the ignition rotor is pointing to the mark or notch on the distributor housing, the engine should now be static timed.

Posted on Jun 12, 2010

  • 1 Answer

SOURCE: 1998 gmc sierra wont start

check your alternator

Posted on Jul 08, 2010

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