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Thread: Help with old system.

  1. #1

    Default Help with old system.

    SBC, Holley Stealth Ram with Commander 950 Pro purchased about 12 years ago, updated wideband O2 sensor 10 years ago, MSD 6A & Blaster coil, HEI 8 pin ignition module, Comp Cam 242°/248°, MSD distributor magnetic pickup locked out. All in a front engine sand rail.

    So up until last year it ran really good, then started to become harder to start. Would start & then stall, if you blip the throttle it would stall. Once warm it ran good, but always seemed to take longer to warm up. So I started troubleshooting. Buddy thought I had a weak spark. So new 6A, Blaster & ignition coil. Troubleshoot plug wires, no change. Next replaced MAP, CTS, & TPS sensor. Has 30 lb/hr injectors, professionally cleaned & flowed. Ran slightly better, but still hard to start and has miss. Have a racer friend who has some engine EFI experience helping. We've been chasing what seems like timing issues. We make changes in the computer, but it has no affect on timing. Side note: Distributor was removed from manifold to reseal intake oil leak. I have checked the distributor placement numerous times, and checked harmonic balancer to be accurate with piston dead stop. Motor only has about 100 hours use, so hard to believe steel gears and double row chain are bad. Software is 3.0.7, and firmware is 3.6. I had to send ECU to Holley for update when I got the wideband O2 sensor. We even drilled a hole in the top of the distributor to watch the rotor. When we try to sync timing and turn the distributor body, the rotor also moves. What are we missing...my brain hurts!

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,694

    Default

    Quote Originally Posted by THE BOMB View Post
    HEI 8 pin ignition module...
    Symptoms of a failing ignition module. Replace it with a genuine GM HEI ignition module.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3

    Default

    Quote Originally Posted by Danny Cabral View Post
    Symptoms of a failing ignition module. Replace it with a genuine GM HEI ignition module.
    OK, I'll give it a try. Just replaced it with a Standard brand, but I understand quality may not be the same.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,694

    Default

    Quote Originally Posted by THE BOMB View Post
    Just replaced it with a Standard brand...
    Well, I wasn't aware you just replaced it. Have your Ignition Parameters changed in Hardware Settings/Engine Parameters?
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

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