Results 1 to 6 of 6

Thread: Software Values Change Themselves Randomly

  1. #1

    Default Software Values Change Themselves Randomly

    I have been running this system on my 76' IH Scout II successfully for a year or two now, but I'm encountering a problem that I didn't notice until now.

    After saving changes in the software, or flashing them to the ECU, the numbers appear differently than I left them. For example: My Cranking Pulse Width might be saved as 19, 14, 12, 8, 6 etc. After pulling it up later, I find it reads like 4, 4, 12, 8, 6.

    It always is a group of numbers (or at least one) that appear randomly out of spec. It occurs even when I save other system changes that never touched those values. The engine certainly sees these changed values, as at random my car won't accelerate or start properly, and I find the values are a completely random number. Thoughts?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,709

    Default

    Software note for C950 TBI users:
    Keep in mind, in order to view a TBI map's actual 'Cranking Pulse Width' values (under 'Startup Enrichment) with the ignition switch off (laptop not connected to vehicle), you must first open and close the 'Engine Parameters' screen (under 'Hdwr Settings'). If not, the numbers will be doubled, as in a MPFI map. This is not an issue when the laptop connected to the vehicle (key on) or when the engine is running.
    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

    Thanks for the note Danny, I was aware that this was an issue, but that's not the case here.
    Unfortunately, this also occurs in the "Acceleration Enrichment" & "Idle Air Control" windows, and despite being connected to computer or not.
    One notable exception to the changing values is that it never messes with the Fuel or Spark Maps, just the single-line tables throughout the software.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,709

    Default

    Is your EFI software version compatible with the ECU firmware version? Corrupted C950 software?
    http://forums.holley.com/showthread....&p=855#post855 (For my own reference.)
    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.

  5. #5

    Default

    Looking into that thread, I forgot about the Force Default Values setup. I believe that I had done it in the past, but possibly reverted to a tune that was before that, and started building from it. I reapplied a Force Default Values setup, and we'll see if it holds stable. Thanks!

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,709

    Default

    Quote Originally Posted by Jeepmb View Post
    I reapplied a Force Default Values setup, and we'll see if it holds stable. Thanks!
    Reply back if that actually resolves your problem. Incidentally, according to Holley Tech, the TBI/MPI1-6 are "theoretical base maps" and are horrible starting points.
    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.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us