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  1. #21
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    Quote Originally Posted by Injuneer View Post
    Did you check spark on any other cylinders?
    No I didnt, at that point I was pretty tired and disillusioned and the engine was already hot so I just did those 2 since they are the easiest to get to without risk of melting my arm hairs, haha

    Why did you have something in mind?
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

  2. #22
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    Just thought it would be worth checking other cyls to see if they were missing. Maybe just not enough to cause a cyl specific misfire code to set. Absence of missing in cyls other than #1 and #3 would tend to confirm a cross-fire issue. Cross-fire pretty much limits the causes to the Opti cap, or the two plug wires. More universal misfires might point to coil, ICM, Opti optical module.
    SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.

  3. #23
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    Quote Originally Posted by Injuneer View Post
    Just thought it would be worth checking other cyls to see if they were missing. Maybe just not enough to cause a cyl specific misfire code to set. Absence of missing in cyls other than #1 and #3 would tend to confirm a cross-fire issue. Cross-fire pretty much limits the causes to the Opti cap, or the two plug wires. More universal misfires might point to coil, ICM, Opti optical module.
    thats a good thought, might do that before I pull it out.

    I already called MSD and they gave me an RMA, kinda sucks since this one has less than 1-2k miles on it. I would have thought they would have checked the cap before sending it out.

    Not sure if you watched the video of Cylinder #1, but everytime the light gets bright like on #3 is when it backfires
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

  4. #24
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    Agree, looks like it's cross-firing. But a quick check won't hurt.
    SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.

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  6. #25
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    So before I send this thing off to MSD, I decided to open it up and measure resistance and what not.

    Keep in mind that I didnt install this thing (first and last time I let somebody else wrench on my car) so I was a little nervous based on the other "work" this mechanic did

    The inside was in really rough shape, tons of rust, I have no idea where it was coming from
    IMG_20170626_213016306_HDR (Large).jpg
    IMG_20170626_213247824 (Large).jpg
    IMG_20170626_213339761 (Large).jpg

    the first thing I noticed first time I opened the hood after they worked on it was that they didnt plug back in the fresh air vent, thinking this might be the cause.
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

  7. #26
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    Quote Originally Posted by captainofiron View Post
    So before I send this thing off to MSD, I decided to open it up and measure resistance and what not.

    Keep in mind that I didnt install this thing (first and last time I let somebody else wrench on my car) so I was a little nervous based on the other "work" this mechanic did

    The inside was in really rough shape, tons of rust, I have no idea where it was coming from
    IMG_20170626_213016306_HDR (Large).jpg
    IMG_20170626_213247824 (Large).jpg
    IMG_20170626_213339761 (Large).jpg

    the first thing I noticed first time I opened the hood after they worked on it was that they didnt plug back in the fresh air vent, thinking this might be the cause.
    that thing wasn't vented. confirm your vent lines are facing correct directions and not obstructed

    Sent from my SAMSUNG-SM-G935A using Tapatalk
    2021 Charger Scat 392
    1994 Firebird Formula 381 stroker - Carrying the torch! - 9.90 @ 134.3mph on a 200 shot

    The wrench/driver for LTConvert's 94 Z28- Ellwein 383/LE Trickflows/ D1SC / CPT Ultra Pro Race 4L60E
    10.78 @ 125mph. Shooting for 9.99 for Frank Cahall!

  8. #27
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    Quote Originally Posted by Tubby Z28 View Post
    that thing wasn't vented. confirm your vent lines are facing correct directions and not obstructed

    Sent from my SAMSUNG-SM-G935A using Tapatalk
    the vacuum line was hooked up to the intake, just the fresh air side was not.

    I am going to test the check valve and filter on the vacuum side.
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

  9. #28
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    our inside man (@96z28SideSwype) pm'ed me back the other day with MSD's findings

    they found was that there was liquid inside the distributor which caused most of the internals to rust up, they also found nitric acid build up inside the distributor due to the fresh air lines not being hooked up. So they had to do a full rebuild on that unit.
    I started looking closer at the water pump its got a slight dexcool stain near the weephole, BUT it was brand spanking new AC delco water pump when the opti went in WTF
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

  10. #29
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    I received the "rebuilt" MSD unit last week

    I have to say it looks brand new, its stamped 12-2016, I know everyone was saying to go with a ACDelco unit, but I cant afford it right now.

    I picked up a new water pump, and decided to put a tube in the weep hole and route it away from the opti, the hole is perfect for a 1/4" thread, I decided to go with a 1/4-28 because its more threads per inch and the threads are shallower than a 1/4-20, the tube I got was a KS precision metals 7/32 x .014 rod and it threaded and bent nicely
    17070213.jpg
    then I sealed it with copper rtv
    17070224.jpg

    Im going to run a hose from the tube down to the driver side of the engine near the sensor, so if I see drips there I know the pump is leaking

    I also decided to attack my EGR flow code issue.

    I pulled the EGR tube out of the header and it was tight so I am thinking the crush gasket is no longer sealing, I put copper rtv on it and reinstalled

    Put it back together and took it for a drive, ran good, was a little hot, I think there are some air pockets still in the system, no more misfire at idle or at high load.

    all the low end torque is back, revs good and smooth at all speeds

    and no more CEL for the EGR!!!!
    97 Trans Am WS6, LT1 factory 4bolt freak, M6,
    68 Firebird 400, YC 400, 670 heads M4
    14 Fiat 500e
    , 83kW motor, 24kWh 364 V battery

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