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2001 Blazer Ignition Timing
01-07-2007, 11:46 PM
I need to set the ignition timing on my 2001 Blazer with a 4.3 liter engine. Can someone tell me the procedure for this and what to set the timing to? I took the distributor out to reseal the intake manifold and I can't find the procedure.
Thanks in advance
01-08-2007, 01:25 AM
Did you try doing a search?? Try this thread (http://www.automotiveforums.com/vbulletin/showthread.php?t=659059)and this post (http://www.automotiveforums.com/vbulletin/showpost.php?p=4553614&postcount=24), should get ya there.
01-08-2007, 06:23 AM
Yes, I searched the forum and did not find what I am looking for. The two threads you posted don't tell me how to set the ignition timing.
01-08-2007, 05:07 PM
Well, if you read the posts closely you would have seen the following - what else do you need to know??
Timing is not adjustable per-say by turning the distributor, as that function is handled by info supplied to the ECM by the crankshaft sensor and the camshaft sensor. To re-set the distributor, bring #1 cylinder up on compression, align the timing marks on the damper pulley and put the distributor in with the rotor pointing towards the number “6” inside the cap.
There are actually two timing marks on the damper pulley ('98). When you are timing the engine, make sure to use the latter timing mark. If you use the other, engine won't start. First mark is before TDC and the second one is TDC. When you rotate engine, don't use the first mark but the second. At TDC the other mark is pointing at 3 o'clock, not 12 o'clock. You can try both of those it doesn't harm the engine.
When you get it the engine TDC compression stroke point the dist rotor as shown in this picture.
If you try to point it to #1 plug wire where it comes out of the cap it does not work. Crazy caps crossover every which way before the fire goes out of the top.
After you get it running you will need to set the camshaft retard setting with a scanner. You will need a engine data scanner capable of reading the camshaft offset degrees.
It will read them in - or + degrees. You need to get it at least 2 degrees -or + or a close to 0 - or +degrees as you can. If it is over 3-5 degrees off the PCM/VCM may set a code on it. What it does is center the dist rotor dead on with the spark wire terminal. You will have to turn the dist to adjust it while watching the setting on the scanner. It has nothing to do with dist timing which is controlled by crank sensor.
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