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LT1-LT4 Modifications
1993-97 Gen II Small Block V8

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Old 11-05-2007, 11:19 PM   #1
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Default Pics needed on 94 optispark mounting. Needed to set the ignition timing.

I have a buddy of mine who has a 1994 Z28 and just replaced the opti and I beleive he mounted it wrong because it is backfiring through the intake. So the ignition timing has to be off. It is a 1994 so the opti is splined.... that makes it a whole lot more difficult to set unlike the 1995's and up. They only go on one way. Send me your pics and how too's... SHbox.com doesnt have them on 1994's.
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Old 11-05-2007, 11:22 PM   #2
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actually i thought 1995+ are harder to set right. 94s have the dowel that only goes 1 way.
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Old 11-05-2007, 11:28 PM   #3
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+1 on this. Ive been stuck on this for like a week. IDK if the opti is bad or not because I cant seem to get it on right.
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Old 11-05-2007, 11:42 PM   #4
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The 95's have the dowel pin on the cam.... not the 94's.
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Old 11-06-2007, 12:17 AM   #5
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damn, this sucks. i thought i had the one way only opti.
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Old 11-06-2007, 12:38 AM   #6
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Dude. Your avatar is ****** scary!
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Old 11-06-2007, 12:53 AM   #7
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Dude. Your avatar is ****** scary!
haha. its old though had it for like 3 years on the computer
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Old 11-06-2007, 01:42 AM   #8
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ZEX-Z I am in the exact same boat as your friend. I don't know what the hell is going on.
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Old 11-06-2007, 07:38 AM   #9
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did you guys get new opti's? i had this problem at work, we ordered the summit brand and i had to return 3 of them because they were phased/indexed wrong compared to the stock one i took off, they were all 120* off in the same spot, so there was a mfg. problem...sent them back, did a little bitching, and got a gmpp one for cheaper and it worked mint
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Old 11-06-2007, 08:23 AM   #10
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When cyl 1 is on TDC, where should the rotor be pointing in relationship to a clock? Maybe I just have mine way off or something.
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Old 11-06-2007, 04:34 PM   #11
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so 94 optis can go in two ways if im reading this right ...if so how do u make sure its on right i havent had my car runnin for over a month because i changed my opti and i cant get it to runn
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Old 11-06-2007, 07:08 PM   #12
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to the top. I also can't get my car to run!
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Old 11-06-2007, 08:23 PM   #13
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****** opti's..... Gm....... Damn you! The person who invented the opti will burn for his mistake......
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Old 11-06-2007, 08:55 PM   #14
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94s have a splined coupler, or shaft. Look at it real close, it has a master spline. It can only go in one way unless you force it. I had one come in the shop fucked up, and it turns out the had the splined shaft off and it was jammed in tight.
The 95+ has the dowel on the cam. Those should only go on one way too, but not sure if they can be installed incorrectly. They do have 3 dif "slots", for lack of a better term, that look like the dowel could fit in.
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Old 11-06-2007, 09:01 PM   #15
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i took my opti off again to see if it was on wrong ang i put it back on and slid right on then i tested my spark and spark plugs are gettin spark i dont no why this damn car is runnin so i no what u guys are goin thru..i hate opti's!!!
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Old 11-06-2007, 09:14 PM   #16
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Quote:
Originally Posted by edcmat-l1 View Post
94s have a splined coupler, or shaft. Look at it real close, it has a master spline. It can only go in one way unless you force it. I had one come in the shop fucked up, and it turns out the had the splined shaft off and it was jammed in tight.
The 95+ has the dowel on the cam. Those should only go on one way too, but not sure if they can be installed incorrectly. They do have 3 dif "slots", for lack of a better term, that look like the dowel could fit in.
+1...they have a master spline that is meant to go on only one way. It is possible to force them on in the wrong position so look careful, line up the splines, and patiently pop it on. You'll know if its on correctly, it'll slide on nice 'n flush.

I've heard of guys forcing on the dowel type incorrectly also....so nothing's fool-proof.

If you're having massive backfire, first thing I would check is Plug wires and firing order. Most common mistake is switching cyl 5 and cyl 7 plug wires. Most of the time if you only switch two it'll still start and just run and pop horribly.

Surprisingly, I also had the same problem with Summit Opti's. They sent me 2 back to back that were faulty from the factory. They also ended up sending me a GM unit instead, worked perfectly.
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Old 11-07-2007, 08:04 PM   #17
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c'mon guys we need some input of this ...i no i especially need somthing to get my car runnin again..how likly is it for 2 gm opti's to be bad any idea?
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Old 11-07-2007, 08:26 PM   #18
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Quote:
Originally Posted by cruzin94 View Post
so 94 optis can go in two ways if im reading this right
They can go in any number of ways if you have a big enough hammer.

It seems impossible to install the 1G opti wrong, but there have been a few people over the years who have managed to force it on in the wrong position.
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Old 11-09-2007, 06:21 PM   #19
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have you checked firing order yet? start with the simple stuff, and report back.
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Old 11-09-2007, 11:53 PM   #20
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Quote:
Originally Posted by AmericanMuscle33 View Post
+1...they have a master spline that is meant to go on only one way. It is possible to force them on in the wrong position so look careful, line up the splines, and patiently pop it on. You'll know if its on correctly, it'll slide on nice 'n flush.

I've heard of guys forcing on the dowel type incorrectly also....so nothing's fool-proof.

If you're having massive backfire, first thing I would check is Plug wires and firing order. Most common mistake is switching cyl 5 and cyl 7 plug wires. Most of the time if you only switch two it'll still start and just run and pop horribly.

Surprisingly, I also had the same problem with Summit Opti's. They sent me 2 back to back that were faulty from the factory. They also ended up sending me a GM unit instead, worked perfectly.
did you end up getting any money off by bitching?
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n/a - 349rwhp/342rwtq
150 shot -471rwhp/561rwtq
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Old 11-09-2007, 11:53 PM
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