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  1. #1
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    Default Igniter n opit????

    Has anybody replaced the ICM thats inside the opti?Im thinking about doing this to mu opti.But would like to know how good they work.
    BEAVER

    94 Z28,4A,LLOYD SG CAM,1.6RR,SHIFT KIT,2,800 STALL,HEADERS,HEADS PORTED & POLISHED,ALL INTERNAL ENGINE PARTS LUNATI !!!


  2. #2
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    Default

    There is no ICM in the Opti. The only thing inside, other than the rotor, is an optical cam position sensor module, and shutter wheel. The original GM unit was made by Mitsubishi. Current replacements are probably all Chinese. If the module is bad, it will set codes DTC 16 and DTC 36. It is possible for the high resolution section to produce erratic RPM signals, leading to idle surges and roughness, but that is best diagnosed with a PCM scan data log.

    The "name" of the part on the AIP Electronics site is incorrect. It is not an "igniter".
    Last edited by Injuneer; 07-30-2017 at 04:37 PM.

    94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams solid roller / TH400+GearVendors OD / 4.11's/Strange 12-bolt / 300-shot (dry) N2O / Spohn Suspension / 6-pt roll bar /AutoMeter instrumentation / MoTeC M48 Pro engine management system /a few other odds 'n ends.

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  4. #3
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    Quote Originally Posted by Injuneer View Post
    There is no ICM in the Opti. The only thing inside, other than the rotor, is an optical cam position sensor module, and shutter wheel. The original GM unit was made by Mitsubishi. Current replacements are probably all Chinese. If the module is bad, it will set codes DTC 16 and DTC 36. It is possible for the high resolution section to produce erratic RPM signals, leading to idle surges and roughness, but that is best diagnosed with a PCM scan data log.

    The "name" of the part on the AIP Electronics site is incorrect. It is not an "igniter".
    Thanks for the help.I was just posting what it said on the site.it said it was a ICM then it had igniter beside it.I was just going by that.Again thanks for the help.Have u did this swap before?
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    94 Z28,4A,LLOYD SG CAM,1.6RR,SHIFT KIT,2,800 STALL,HEADERS,HEADS PORTED & POLISHED,ALL INTERNAL ENGINE PARTS LUNATI !!!


  5. #4
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    Default

    No. The AIP Electronics optical cam position module has only been available for the past yer or so. Before that, if the module failed, you needed a new back 1/2 of the Opti.

    What problem are you trying to fix by replacing the module?

    94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams solid roller / TH400+GearVendors OD / 4.11's/Strange 12-bolt / 300-shot (dry) N2O / Spohn Suspension / 6-pt roll bar /AutoMeter instrumentation / MoTeC M48 Pro engine management system /a few other odds 'n ends.

  6. #5
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    Thanks injuneer.I have a few code numbers for u.I think they all go back to the opti.Code 43,18,33 and 22 witch is the TPS.Anyway what do u think?
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  7. #6
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    Default

    None of those codes have anything to do with the Opti.

    18 - faulty fuel injector or circuit

    22 - TPS sensor low voltage (less than 0.20 volts)

    33 - MAP sensor high voltage/low vacuum

    43 - faulty knock sensor or circuit

    All relatively easy to troubleshoot with a multi-meter.

    94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams solid roller / TH400+GearVendors OD / 4.11's/Strange 12-bolt / 300-shot (dry) N2O / Spohn Suspension / 6-pt roll bar /AutoMeter instrumentation / MoTeC M48 Pro engine management system /a few other odds 'n ends.

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  9. #7
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    I know thats what the codes are.but as I was researching into all the codes.It kept going back to opti.It would say faulty injector circuit also could be opti making it throw this code.All was saying that kind of thing.One was mulitple codes could be opti spark.thats why I was still thinking opti.Also I put a new MAP sensor and TPS on it a few months back.I replaced both oxygen sensors during the rebuild.I wouldnt think all would be bad after buying them so soon.What do u think I should do next?Im asking because I would really like to know.I dont what to do next!!
    Last edited by beaver50; 08-04-2017 at 03:37 PM.
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  10. #8
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    Where did you read that "It would say faulty injector circuit also could be opti making it throw this code"?

    I have been doing this for 20 years, addressed these codes probably 100 times each.... but to make sure I wasn't totally senile in my old age, I just checked in the 1994 FACTORY service manual. The diagnostic logic charts for these codes do NOT refer to the Opti being the cause. They all do go back to the PCM, however. Faulty injector driver in the PCM will set DTC 18. DTC 22, 33, and 43 ALL revert back to the PCM, if the sensor is not faulty, and the wiring circuit is not faulty. They all rely on a 5 volt reference from the PCM.

    But maybe someone else can give you the answer you are looking for.

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  12. #9
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    @beaver50 it's either a wiring harness issue or pcm issue. Fred is correct

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  13. #10
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    Default

    I give u the wrong codes.Code 43,36,34,18 n 22.Im sorry,I was going by memory.I went n got my paper with the codes on it.
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    94 Z28,4A,LLOYD SG CAM,1.6RR,SHIFT KIT,2,800 STALL,HEADERS,HEADS PORTED & POLISHED,ALL INTERNAL ENGINE PARTS LUNATI !!!


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