David request “Why am i pointing the rotor in the direction of the #6 plug when it’s #1 ~ above compression stroke and should it is in firing ??? appears to me the should point towards #1 plugin cap !!!”Confusing, isn’t it. Let’s check out if we have the right to make some feeling of it.For end 40 years, Chevy adhered to the traditional convention that ‘V’ engine distributor cap which relied on the basic design of the firing bespeak being determined by the location of the sparkplug wires in the appropriate tower the the cap. In many cases, this compelled some wires to cross over or under various other wires. This produced some really ‘messy’ plug wire routing, and feasible ‘cross firing’.

You are watching: 4.3 vortec spark plug wire diagram


In 1996, along come the 4.3L V6, and the 5.7L V8 ‘Vortec’. Because this is the year emission control standards upgraded come ‘OBDII’ specifications, all engines had actually to combine a totally new set of ‘sensors’ or sending units. The enhancement of these, necessitated major modifications come the engine’s design. While they were at it, Chevy decided to ‘clean up’ this cable routing mess and totally ‘re-invent’ the distributor cap, as it had been well-known for decades. Ironically, this is the last style that provided a distributor.

The ‘Vortec’ cap is design in such a method as to neatly permit for the placement of the spark plug wires to affix as though the shooting order to be such that 4 plugs fire ~ above the right and also 4 plugs fired on the left. If you look closely at the photos, friend will notification that they didn’t readjust the shooting order, lock literally moved the ar of the spark plug cable tower that #’s 1 and also 4, ~ above the V6, and also #’s 2 and 3 on the V8. This actually creates one ‘across the cap’ firing; not a overcome fire, order.



This is why, as soon as installing the distributor in the V6, you aim the rotor tip at the #6 mark on the distributor body. Same goes for installing the V8 distributor, back this isn’t fairly as confusing because the #8 mark is closer come the #1 cap tower, and also doesn’t seem as counter-intuitive.


Two other things to save in mind. The distributor equipment has ‘angled’ teeth. Together such, as soon as you drop in the distributor, rotate the rotor, counter clockwise around 30 levels in order for it to finish up in the appropriate place. Also, when doing this, the bottom that the distributor column has, what is like a large straight-slot driver that needs to engage the oil pump driveshaft. It’s not unusual to have to turn the driveshaft in order to accept the distributor pillar in the proper orientation.

To read part 1, click here: Chevy 4.3 & 5.7L Vortec Distributor Install, component 1

So... What carry out you think? Please leaving me a comment.

Vale:Helpful blog and also diagrams! Is this miscellaneous an average person have the right to do, or would it aid to have a little of mechanically knowledge?
svfixer:Pretty straight forward task. Anyone might do it, yet the likely hood that the average human being needing to carry out it is negligible.
Tom:After law the setting to TDC on compression punch and setup the distributor properly, perform you still have actually do the 2000 rpm procedure ?
Larry Dorr:Well im from the old school and was completely confused. Now that ive check out this i totally understand. Great lesson. Say thanks to you
Don Hedrick:Outstanding mine friend. I have the 5.7 in mine boat. Cane us go one step farther? exactly how to remove and also replace camer position sensor? Engine will certainly fire and also run for around 5 seconds, or less, and then close up door down.
Runbry:I think this video was much information and, hopefully it is the lacking piece to carry my 350 ago to life, thank you because that the insight
Jake:On the illustration mirroring the mark on the shaft and the one top top the gear, if the mark isn’t ~ above the distributor shaft what carry out you recommend? i was supposed to change one in a 2002 Chevy 4.3 PU now for a lady and also noticed that doesn’t have actually a mark! The answer is most likely going to it is in obvious and also I’ll feel prefer a fool but if girlfriend don’t ask inquiries you can’t learn. Many thanks for the aid and acquisition time to carry out this to aid people.
svfixer:I believe if you go by the images that present the ‘lead’ position of the rotor before install, that will an outcome in the same.

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Darron:Hi I have a 86 chevy 4.3v 6. I can obtain it to fire my lid has constantly been one facing front of motor at the 6oclock climate going clockwise 65432. What am ns doing wrong
Scott trace 97 K1500:Do you usage any type of dielectric grease in the obd distributor? I simply cleaned every little thing up and also wanted come know prior to I put it back together.
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