Totally lost!
Thread Starter
Staging Lane
Joined: Sep 2006
Posts: 73
Likes: 0
Totally lost! Well i recently just replaced my optispark wtih a new one and it still has the problem with mis firing and still smokes black out of the tail pipes. i was wondering if it could be the plugs or wires. it does not misfire when cold, but has trouble climing rpm's so if anyone would know what the trouble is i would greatly appriciate it. 
i went thru exactly the same thing, it turns out it was a chipped spark plug. i bet you thats whats wrong with your car, do you know what kind of plugs were in there? i had bosch platinum +4 p.o.s.'s when mine broke.
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I just skimmed the replies, and some of this will be a respost, but let me lay out my advice:
1. Check all plugs and wires Ensure no plugs are broken and no wires burnt. Also ensure no wires are crossed (!). Had a buddy "helping" me once cross my #2 and #4 plug wires.
2. Test your ignition coil.
3. If none of the "easy" stuff works, you may have to bite the bullet and pull the new opti off and ensure it was not installed wrong. On a '94 you still have a spline drive. Make sure the dead spline is lined up with the appropriate hole in the cam and the appropriate hole in the back of the opti. You would think it's hard to do... but years ago I myself installed my opti with the splines not lined up. Was really pissed as I had to spend 1/2 the next day redoing the job.
Good luck.
1. Check all plugs and wires Ensure no plugs are broken and no wires burnt. Also ensure no wires are crossed (!). Had a buddy "helping" me once cross my #2 and #4 plug wires.
2. Test your ignition coil.
3. If none of the "easy" stuff works, you may have to bite the bullet and pull the new opti off and ensure it was not installed wrong. On a '94 you still have a spline drive. Make sure the dead spline is lined up with the appropriate hole in the cam and the appropriate hole in the back of the opti. You would think it's hard to do... but years ago I myself installed my opti with the splines not lined up. Was really pissed as I had to spend 1/2 the next day redoing the job.
Good luck.
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I have found best to always replace plugs and wire's when doing the opti,I have found that before the opti goes out it produce a high voltage spikes and overload the wires,I had some that the wires where pierced by the voltage overload.
TECH Fanatic
Joined: Jan 2005
Posts: 1,162
Likes: 0
From: St. Augustine, FL
Just a thought here,.. your mechanic gave the car back to you like this without any recomendation on what could be wrong? If you paid for the opti replacement through the shop, thats a good chunk of change and I would ask that the mechanic check his own work. At least change the 02's to see if that fixes it and if not, hold on to the old ones as spares and go talk to your mechanic.
Originally Posted by TWS
...but years ago I myself installed my opti with the splines not lined up. Was really pissed as I had to spend 1/2 the next day redoing the job.
That's was an idea when my car was giving me crap, we thought the Timing was off. It's running now though..
As far as your problem, it sounds like it could be Timing, but bad wires or plugs also might be mixed in there. A reference for when the Timing is off, you will have some wicked back-fires, I have seen it.
Last edited by the_merv; Oct 29, 2006 at 12:49 AM.
TECH Apprentice
Joined: Aug 2004
Posts: 333
Likes: 0
From: Gulfport, MS
Originally Posted by infinitebird
could be bad O2s if it doesn't do it cold (in open loop)
Originally Posted by FAD2BLK93
Another vote for the 02's here
Originally Posted by 94CamaroLT1
ok could it maybe be the o2 sensors as well im not sure but just checking?
Are you even reading the replies?
TECH Apprentice
Joined: Aug 2004
Posts: 333
Likes: 0
From: Gulfport, MS
Originally Posted by 94CamaroLT1
yeah i am? i made this thread and only 2 people think its the o2s and i want to have more than 2 people say so before i put 100 bucks into sensors.. kinda makes sence to me?
*edit*
1994-1995 heated o2/1996-1997 front heated o2: AC-Delco #AFS75 25312184
Last edited by Bawls; Oct 29, 2006 at 05:27 AM.
you can check and see if it is really the o2's by unpluging both of them from their harness. It will force the computor in open loop and then after a while when the engine heats up you will know if it is fact the o2's or its another problem related to heat.