are you running a stock opti and have you upped your rev limiter 
high rpm miss
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Joined: Oct 2003
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high rpm miss figure i'll give it another shot
car misses around 5800+ i've been fighting it for many years now with no luck.
changed plugs & wires many times, 3 different opti, 2 different ignition boxes, 3 coils, 3 different valves springs, 2 cams, 2 different set of heads, 2 ecu, 2 opti harnesses, ignition modual, fuel pump, injectors....
not all of those thing i changed was to get rid of the miss but just giving you and idea of what i've been through
plus im sure i missed something
http://www.mofbody.com/blkchevyz/chsheads.jpg
http://www.mofbody.com/blkchevyz/fmsdyno.jpg
http://www.mofbody.com/blkchevyz/webdocs/dynosmall.jpg
car misses around 5800+ i've been fighting it for many years now with no luck.
changed plugs & wires many times, 3 different opti, 2 different ignition boxes, 3 coils, 3 different valves springs, 2 cams, 2 different set of heads, 2 ecu, 2 opti harnesses, ignition modual, fuel pump, injectors....
not all of those thing i changed was to get rid of the miss but just giving you and idea of what i've been through
plus im sure i missed something
http://www.mofbody.com/blkchevyz/chsheads.jpg
http://www.mofbody.com/blkchevyz/fmsdyno.jpg
http://www.mofbody.com/blkchevyz/webdocs/dynosmall.jpg
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Thread Starter
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put 3 differnt opti's on it. so i think that rules that out
i know its not the rev limiter becuase both the ecu and accell are at 7k
i wouldnt think it would be valve float, had 3 different sets of springs on the car
and my old head with the springs and 306 cam are on another car that doesnt have this issue.
i know its not the rev limiter becuase both the ecu and accell are at 7k
i wouldnt think it would be valve float, had 3 different sets of springs on the car
and my old head with the springs and 306 cam are on another car that doesnt have this issue.
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miss, stumble... call it what ever you want. my cars a 94 so it doesnt have the crank sensor... so it wont know throw a code
thats the only thing i havent tried, that i can think of. i've just thrown so much money at it i'd hate to keep doing it.
thats the only thing i havent tried, that i can think of. i've just thrown so much money at it i'd hate to keep doing it.
I have the same problem with mine, but I haven't tried as many things as you. Also, my miss/stumble starts at 4500.
Here is a list of what I have changed:
plugs (NGK TR6, and Autolite 104's-gapped to .032)
wires
2 opti's (Both new GM units)
opti extension harness
engine wiring harness
ECM
Crane HI-6 with LX92 coil
stock ignition
I never felt the problem before I put the blower on (it's a ported heads/CC306, stock bottom end), so I took the car back to NA, put the 30# injectors back in, along with my other ECM with the original Ed Wright tune. Took it for a spin and I didn't feel anything. Then I put it back on the dyno (NA) and the graph looked similar, but not NEARLY as bad. So it was doing it NA, but I couldn't feel it. Looked up some old dyno sheets (from 3 years ago) and it didn't show in those graphs.
I'm at a loss too....pulling my hair out trying to figure it out.
Here is a list of what I have changed:
plugs (NGK TR6, and Autolite 104's-gapped to .032)
wires
2 opti's (Both new GM units)
opti extension harness
engine wiring harness
ECM
Crane HI-6 with LX92 coil
stock ignition
I never felt the problem before I put the blower on (it's a ported heads/CC306, stock bottom end), so I took the car back to NA, put the 30# injectors back in, along with my other ECM with the original Ed Wright tune. Took it for a spin and I didn't feel anything. Then I put it back on the dyno (NA) and the graph looked similar, but not NEARLY as bad. So it was doing it NA, but I couldn't feel it. Looked up some old dyno sheets (from 3 years ago) and it didn't show in those graphs.
I'm at a loss too....pulling my hair out trying to figure it out.
I have the same problem. I have a MSD 6A, with a msd coil. My car has a miss at just over 6k. I shift the motor at 6400, and ususlly around 6100 and 6300, it feels like the motor misses on 1 or 2 cil. I have put on a new opti cap/rotor, new wires/ plugs. I plan on putting on a new opti this winter to see if it fixs the problems but i have a bad feeling it will not.
Originally Posted by dhdenney
Is your timing too aggressive? What kinda timing are we logging at WOT?
I am seeing 0 knock retard.
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Originally Posted by dhdenney
Is your timing too aggressive? What kinda timing are we logging at WOT?
but i have tried pulling alot out and it still missed.
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Originally Posted by Ponyhntr
I have the same problem with mine, but I haven't tried as many things as you. Also, my miss/stumble starts at 4500.
Here is a list of what I have changed:
plugs (NGK TR6, and Autolite 104's-gapped to .032)
wires
2 opti's (Both new GM units)
opti extension harness
engine wiring harness
ECM
Crane HI-6 with LX92 coil
stock ignition
I never felt the problem before I put the blower on (it's a ported heads/CC306, stock bottom end), so I took the car back to NA, put the 30# injectors back in, along with my other ECM with the original Ed Wright tune. Took it for a spin and I didn't feel anything. Then I put it back on the dyno (NA) and the graph looked similar, but not NEARLY as bad. So it was doing it NA, but I couldn't feel it. Looked up some old dyno sheets (from 3 years ago) and it didn't show in those graphs.
I'm at a loss too....pulling my hair out trying to figure it out.
Here is a list of what I have changed:
plugs (NGK TR6, and Autolite 104's-gapped to .032)
wires
2 opti's (Both new GM units)
opti extension harness
engine wiring harness
ECM
Crane HI-6 with LX92 coil
stock ignition
I never felt the problem before I put the blower on (it's a ported heads/CC306, stock bottom end), so I took the car back to NA, put the 30# injectors back in, along with my other ECM with the original Ed Wright tune. Took it for a spin and I didn't feel anything. Then I put it back on the dyno (NA) and the graph looked similar, but not NEARLY as bad. So it was doing it NA, but I couldn't feel it. Looked up some old dyno sheets (from 3 years ago) and it didn't show in those graphs.
I'm at a loss too....pulling my hair out trying to figure it out.