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4.3 Firing Order

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Old 07-17-2007, 12:13 PM   #1
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4.3 Firing Order

Just bought my first S10. It a 94 LS 4.3 Extended Cab, all stock.

I'm doing plugs, wires, cap & rotor tonight. Can anyone tell me the firing order for this V6?

thanks, Bill
Old 07-17-2007, 12:33 PM   #2
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Re: 4.3 Firing Order

I'm pretty sure they're all 1-6-5-4-3-2, clockwise rotation.
Old 07-17-2007, 12:35 PM   #3
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Re: 4.3 Firing Order

Quote: Originally Posted by nater006
I'm pretty sure they're all 1-6-5-4-3-2, clockwise rotation.
bingo... i believe you are absolutely right... just did a tune up on one the other day... a bitch to get at the back plugs
Old 07-17-2007, 12:40 PM   #4
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Re: 4.3 Firing Order

Have fun with #3! let us know how it goes

Fun motor to play with!
Old 07-17-2007, 12:40 PM   #5
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Re: 4.3 Firing Order

Quote: Originally Posted by MattSS
Have fun with #3! let us know how it goes

Fun motor to play with!
ha ha... i really hope that was sarcasm...
Old 07-17-2007, 12:44 PM   #6
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Re: 4.3 Firing Order

thanks for the info.

I'll let you all know how it went.
Old 07-17-2007, 12:46 PM   #7
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Re: 4.3 Firing Order

yea it was lol
Old 07-17-2007, 12:52 PM   #8
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Re: 4.3 Firing Order

Highly recommended to read the sticky in this forum regarding replacing the infamous #3 plug. The steering shaft takes all of a couple minutes to deal with and get out of the way and will make it much less of a headache than going after it with a convoluted assembly of specialty sockets, u-joints, or goofy wrenches

Good luck!
Old 07-18-2007, 09:58 AM   #9
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Re: DONE

I lifted the front end up on jacks and removed the drivers side tire for #3 & 5.

For #3, removal was quick with a 5/8 deep well socket approx 2 1/2 inch long and a swivel. To reinstall the #3 plug, I used just the socket and before I put the plug in I added a small piece of foam to the bottom to push the plug threads out a little more. the socket with the plug installed fit inside of the steering shaft and I was able to square the plug to the hole and then screw the plug in.

I tried just screwing the plug into the hole by itself but was not able to square up on the hole and still be able to hold the plug. The socket diameter allowed be to be able to have something to grip to and still be able to square up to the hole and manually thread it in.

Thanks for all of the advice and I am sure I will be posting future questions. This S10 is being used as my everyday driver. I also took it to my local 1/8 mile dragstrip the first week I got it. My plan is to run test and tune events until my bracket car is finished, which should be sometime early next year. My bracket car went thru a major rework and I have not raced for 3 years so the little S10 was a blast.

I am having 245-60 -15 installed on the stock 7" wheels in back tommorow and then I'll go back to the track and see how it does. I was spinning before on a worn out set (dry rotted) 205-75-15's. I'll put a newer front tire on to try and get this thing to cut a light. The front tire might be a little bit taller. Will this have in effect on the ABS?

The tune up really made a difference. I suspect the wires were original and had to do with the slight roughness to the motor idle. The plugs and cap were newer and the plugs for the most part looked ok. The idle is much nicer at start-up and it seems more responsive.

thanks all, Bill
Old 07-20-2007, 12:44 AM   #10
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Re: 4.3 Firing Order

you can kinda see it in here.

Old 07-20-2007, 07:46 AM   #11
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Re: 4.3 Firing Order

My 94 firing order is 1-2-3-4-5-6
Old 07-20-2007, 07:37 PM   #12
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Re: 4.3 Firing Order

Easiest thing to do is change them one at a time. Of course that diagram ought ot be in every-ones haynes. Good investment. Label them. Yes, depending on style of cap; there are firing order correcting caps that are labelled. From the factory these are Horizontal caps. Watch out for the factry horizontal cap. I think one and three are labelled right but not firing order corrected.
Old 04-23-2009, 05:09 PM   #13
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Re: 4.3 Firing Order

oops didnt mean to hijack a thread, thanks for the illustration on the firing order and which cylinder is which , pulled my drivers side plugs finally cuz i knew they were less fun to pull than the passenger side and had not very many miles on them but i still had to check em cuz of a miss, and a pig,a hog- dog (my 1988 4.3 s10 is lots stronger than this 1994 ) and less than 15 MPG - 1994 "W" 4.3 2wd - 2 plugs center insulator is half black and half white , the other one looked like it was covered with light brown carbon, but still a good gap it just wasnt firing, so i bought autolite platinums cuz they dont offer AC platinums for a 94 4.3
oils clear no antifreeze in it, antifreeze is green no oil in it, oil consumptions nil,
drivers side plugs arent hard to R&R, just jack up the truck, slide the wheelwell mudflap up under the brake lines out of the way, and there are the plugs just above the tire - bend a heavy coat hanger into a suitable U shaped hook with a handle to fit around the insulator to remove the wires and they pop right off ,. reaching in to where they stop to pull on them --to replace the new plugs, my heat sheilds , and the steering shaft are in the way of starting the plugs with the socket , so i got a piece of hose that fit real snug on the plugs tip- i think its about 1/4" id hose and i could get em started with the hose
these platinums arent supposed to foul nearly as easy and they got a 3 year warranty (whatever) for a couple bucks more each ill do it - hoping for more smooth acceleration and power and MPG

Last edited by pudd750; 04-23-2009 at 05:15 PM. Reason: new stuff i thunk of
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