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Old 06-26-2008, 09:25 AM   #1
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Default firing order

What is the firing order for the left and the right side of the cap on a 1997 firebird formula. Also I did a opti switch and plugs this weekend, now my car went from dying to just have a bad miss. Do you think that my opti pigtail could be bad?
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Old 06-26-2008, 09:56 AM   #2
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Quote:
Originally Posted by LT1 Chevelle View Post
What is the firing order for the left and the right side of the cap on a 1997 firebird formula. Also I did a opti switch and plugs this weekend, now my car went from dying to just have a bad miss. Do you think that my opti pigtail could be bad?
drivers side from top to bottom: 5,3,7,1
pass. side from top to bottom : 4,6,8,2.

Engine firing order is 1,8,4,3,6,5,7,2

before blaming anything else, make sure your wires are on right, and try it then go from there
Let us know
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Old 06-26-2008, 10:20 AM   #3
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Ummm those cylinders are out of order for an LT1 ^ Firing order is right. Make sure you got the opti indexed properly too, it's easy to miss the place where the peg is suppose to go.

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guys with stock throttle bodies have smaller orifices.
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Old 06-26-2008, 11:20 AM   #4
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How is it out of order
Looking at your diagram, which is from shoebox's website, my description is bang on. Am I missing something here?
I did the same on my LT1, and she runs on all 8 cylinders, so I dont know man
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Old 06-26-2008, 11:38 AM   #5
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Doh! Sorry my mistake, I thought you were giving him the cylinder order on the block. I reread your post and saw the err of my ways. My apologies.
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guys with stock throttle bodies have smaller orifices.
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Old 06-26-2008, 11:39 AM   #6
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If your talking about cylinder layout, which I think you are, then the layout is:
drivers front to back 1,3,5,7
pass front to back 2,4,6,8


but this is NOT what the O/P was asking, he was asking about the opti terminal layout, which I answered
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Old 06-26-2008, 11:40 AM   #7
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Quote:
Originally Posted by BrdwAtti2d View Post
Doh! Sorry my mistake, I thought you were giving him the cylinder order on the block. I reread your post and saw the err of my ways. My apologies.
Thats cool
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Old 06-26-2008, 02:25 PM   #8
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what do you mean by indexed? I thought there was only one way the opti could go in. I am pretty sure everything is hooked up correctly, not sure why I have a bad misfire now.
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Old 06-26-2008, 02:47 PM   #9
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If you accidentally drop the key on the camshaft into one of the cloverleaf things on the back of the opti, the opti will go on but the indexing is all screwed up.

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guys with stock throttle bodies have smaller orifices.
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Old 06-26-2008, 03:03 PM   #10
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i know that i put that in the right spot.
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Old 06-26-2008, 04:58 PM   #11
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Quote:
Originally Posted by LT1 Chevelle View Post
i know that i put that in the right spot.
...said by many a person...



Hopefully, you're correct.
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Old 06-26-2008, 07:11 PM   #12
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I also said it & i'll be damn come to find out it wasn't in the right hole if i was a betting man i'da lost it all .
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Old 06-26-2008, 09:58 PM   #13
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I focused hard on putting it in right. Matter of fact I checked it twice, too make sure. Who knows i am only human. I have been doing most of my own mechanic work so I think it is time for a mechanic. I have this motor and combo in a 71 chevelle. Do you think that the opti pigtail could be bad. Also can I throw off the timing by turning the opti once it is in?
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Old 06-27-2008, 05:56 AM   #14
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Yea the harness could be bad. You shouldn't be able to turn the opti once it's in.
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guys with stock throttle bodies have smaller orifices.
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Old 06-27-2008, 09:17 AM   #15
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^^ exactly, if you can turn the opti when installed on the motor, you would be turning the whole motor as well, highly unlikely. If it turns without much resistance, you got some issues my friend. Check to make sure nothing is broken in that timing cover
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