I've got no spark. I noticed it starting to stumble at low rpms earlier today. This may be the first opti-spark job on the ws6. Its a 96. Whats the best way to go about narrowing down the culprit. I just went to go start it up and nothing, I havent done much diag with the exception of checking for spark and probing the ignition fuses. I know all the traditional stuff such as checking the coil, wiring, ignition mod etc, but is there a quick way to check the opti spark, since I know this to be a real trouble area?
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96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there
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hows the coil?
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Like I said, I havent done any diag on it yet. Its kinda late, so I will start probing around tommorrow. I know I can figure out the problem by testing everything else, but I was wondering if there was an easy way to check the opti. I figure since this is such a common problem, I should start there. If the only way to check the opti is to check all other ignition components first, then so be it. Cant wait
96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there )
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You can use this info. Your coil wiring and plug will be slightly different from the diagram, but the ICM won't.Rob B 95Z A4 Tech Page (Part numbers / locations, how to's, schematics, DTC's...) Home Page - shbox.comComment
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Thanks Rob, thats what I was looking for. I appreciate that.96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there )
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OK, according to Robs diagram, I do not have an ignition reference of 4V AC on the white wire off of the ICM. According to my elec diagrams, this is the wire coming FROM the PCM. Would you recommend checking for voltage from the opti to the PCM, or is it just assumed that if the PCM isn't sending a refernce to the ICM, then its not getting a refernce from the OPTI?
In other words.......
According to my elec diagrams, if there is no reference on the white ICM wire, it could be a faulty computer OR a faulty OPTI. What kind of current should I have coming from the opti TO the PCM?96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there )
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the pcm needs to know what the opti is
doing to send the signal
if it don't, then it can't send the signalComment
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Also....................I was just thinking. How does the Crank position sensor work in the system? It seems redundant to have a CPS and an Optical sensor. What is the strategy in this system, how does it work? I need to understand how the components work together to get an accurate diag. I cant throw parts at this thing; my wife will shoot me!
96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there )
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BAS, I understand that. How do I check the signal from the Opti to the PCM?96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there )
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I have not seen any specifics on what to look for directly from the opti. Generally, the pcm does not fail all that often, so it is more likely the opti. You can, however, use an ohmmeter to verify the sections of wiring are good from the opti>pcm and from pcm>ICM.Rob B 95Z A4 Tech Page (Part numbers / locations, how to's, schematics, DTC's...) Home Page - shbox.comComment
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OK, thanks, anybody got anything on how the crank pos. plays a role in this?96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there )
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What year is your car?
94/95 didn't have a crank position sensor.
96-97 did.Comment
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The crank position sensor does not play any role in spark timing/production on the LT1. It is only there for misfire detection that was added with OBD-II. That's why only the 1996-97s had it.Originally posted by BAS
What year is your car?
94/95 didn't have a crank position sensor.
96-97 did.Rob B 95Z A4 Tech Page (Part numbers / locations, how to's, schematics, DTC's...) Home Page - shbox.comComment
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Do you have an SES light?
Trace the white wire as far back as possible and try it there. The wire may have become pinched somewhere along it's length.
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Thanks guys, that info is helpful, specifically the CPS info. So , really it only leaves me with PCM, Opti or wiring as Joe said. I am not so likely to think its probably not the computer, because the battery troubles I had been having. If you read my last post, I left the bottle heater on and drained the battery, so I had to jumpstart it a few times. I realize its a long shot that this has anything to do with the problem, but I want to be sure. I will do some more checking tonight after work and let you guys know how it turns out. Thanks again.
Also, Joe, I havent checked it with the scanner yet. I am going to bring it home tonight and see. Would a bad opti trip a code?96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there )
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