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Dodgeman

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Reply with quote  #1 
I thought you would be the one to ask. How do you set the timing on a 98 Vortec 350?

Thanks in advance

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94Blazer

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Reply with quote  #2 
With a Tech 2 scan tool if your starting from scratch. You can get them pretty close by marking the dizzy and the intake.
But if you have no clue whether its in time now  (setting it blind so to speak) Get your number one on TDC (Driver side front is numero uno) by pulling the spark plug and sticking your finger over  the plug hole and bumping the starter till it blows your finger off the hole. Then put the button where the button is facing # one on the cap , then look at the bottom and see which way your pump drive is facing, and align the oil pump driveshaft accordingly. Drop the dizzy in there and bolt her down. That should get you close enough to get it to a shop with a Tech 2.

Id call around to the local shops around Tracy and surrounding and find a shop with that scan tool.


Sorry for the novel , I didnt know if you needed the whole procedure or just the fine points . No such thing as being to detailed....

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94Blazer

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Reply with quote  #3 

If you by some miracle ,get your hands on a Tech 2 , Ill show you how to do it .


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Bruce

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Reply with quote  #4 
From Alldata

  1. Bring cylinder number one piston to Top Dead Center (TDC) of compression stroke.



  1. Remove the distributor cap bolts and discard.
  2. Remove the distributor cap.



  1. Install a NEW distributor gasket onto the distributor.



  1. Align the indent hole on the driven gear with the paint mark on the distributor housing.
  2. Ensure that the distributor rotor segment points to the cap hold area.



  1. Align the slotted tang in the oil pump driveshaft with the distributor driveshaft. Rotate the oil pump driveshaft with a screwdriver if necessary.
  2. Align the flat (1) in the distributor housing toward the front of the engine.
  3. Install the distributor and distributor clamp.



  1. Once the distributor is fully seated, align the distributor rotor segment with the number 8 pointer that is cast into the distributor base.
  2. If the distributor rotor segment does not come within a few degrees of the number 8 pointer, the gear mesh between the distributor and camshaft may be off a tooth or more. Repeat the procedure in order to achieve proper alignment. NOTICE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.



  1. Install the distributor clamp bolt. TIGHTEN Distributor clamp bolt to 25 Nm (18 lb ft).



  1. Install the distributor cap onto the distributor.
  2. Install the NEW distributor cap bolts. Do not overtighten the NEW distributor cap bolts. TIGHTEN Distributor cap bolts to 2.4 Nm (21 lb in).



  1. Install the ignition coil wire harness.


Dodgeman

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Reply with quote  #5 
DANGGGGG. That sucks idk if it's off or not the guy I bought it from said he bumped the dist. He thinks. But there's no way of getting it on without having to take it off to someone?
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Bruce

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Reply with quote  #6 
AFA setting timing w/ a tech 2



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:

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

ADJUSTING PROCEDURE

  1. With the engine OFF, slightly loosen the distributor hold down bolt. IMPORTANT: Cam Retard Offset reading will not be accurate below 1000 RPM.
  2. Start the engine and raise engine speed to 1000 RPM.
  3. Using a scan tool monitor Cam Retard Offset.
  4. 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.
  1. Repeat step 4 until 0°+/-2°, is obtained.
  2. Turn the ignition OFF.
  3. Tighten the distributor hold-down bolt to 3 Nm (25 lb. ft.).
  4. Start the engine, raise engine speed to 1000 RPM and recheck Camshaft Retard Offset.


Bruce

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Reply with quote  #7 
If it has a code 1345 in it, then it is installed wrong.
Dodgeman

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Reply with quote  #8 
Thanks Bruce
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Dodgeman

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Reply with quote  #9 
Thanks blazer
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94Blazer

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Reply with quote  #10 
You can get it close enough to run w/o a Scan tool but you cant get it dead on w/o special powers if you dont take it somewhere with a Tech 2. Ive literally took a scribe and put matching lines on the intake and dizzy and was still 5 degrees off. When its hooked up to the scan tool you touch the dizzy and move it 5 degrees and not even know it. Can be a PITA if your tring to set it alone.

If he bumped it , Id say its def off. You bought this motor from WColvert right? He posted that he tried to set the timing and didnt even know you need a scan tool to do so. It amazes me how people will try and set the timin on these motors by ear . They aint even got a timing tab on the front cover. GM FI engines have to be dead on to run in tip top shape. Otherwise theyll either overheat or be 'slow' on revs.

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Dodgeman

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Reply with quote  #11 
Yes I did. Well how much does that normaly cost?
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94Blazer

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Reply with quote  #12 

Ha ha. Bruce , with your fancy pants Alldata. I aint got that sh!t for these buses. LOL


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94Blazer

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Reply with quote  #13 

Just ask them what they would charge to set the timing with their Tech 2. Some places are 90 bucks an hour min with computer diagnostics. Shouldnt take more than that though


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Bruce

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Reply with quote  #14 
Quote:
Originally Posted by 94Blazer
Otherwise theyll either overheat or be 'slow' on revs.


Really? How far off do they have to be to do this? I have never set one with a Tech2 , but have done countless intakes on them and have never had any issues.
Dodgeman

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Reply with quote  #15 
This engine is being a pain in the but allready
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