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Thread: MAP lazy/incorrect?

  1. #11
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    Which EFI software/ECU firmware version are you using?
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, 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.

  2. #12

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    V4 Build 32. Should I stay with V4 or go to V5? I didn't update any more because my other turbo car has V4 Build 32, and its version convenient to have them both on same EFI software.

  3. #13
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    You don't have to update to V5.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, 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.

  4. #14

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    OK, I'll try latest V4 in it when I get it back.

  5. #15
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    Yeah, that's what I'd do.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, 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.

  6. #16

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    So update. I figured it out today. To be honest Holley tech wasn't much help. So I got the ECU back today, Holley stated there was nothing wrong with ECU or tune. I plugged it in same symptoms. So I started from scratch, built new downloaded V5/110. Built new tune in V5 (same perimeters as old). Did firmware update and same issue. Called Holley they were clueless and told me to take it to a Holley EFI certified tech...ugh! Anyway I went and plugged in the old AEM MAP sensor and boom correct MAP readings! Now keep in mind with old V4 in it, this MAP sensor didn't work either. Plugged the brand new Holley 3.5 MAP sensor back in, frozen MAP kPa readings again. Put AEM MAP sensor back on, car fired right up. So best we can figure I was dealing with both a corrupt firmware issue and a bad MAP sensor. I was disappointed on how unhelpful Holley tech service was. All that said car seems to have a skip and wouldn't idle. Stuff I can get figured out though.

  7. #17
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    So Holley Tech was right, there's nothing wrong with the ECU or tune. Did you select the correct bar MAP sensor in the Sensors ICF, click Save and cycle key off/on?
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, 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.

  8. #18

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    Yes, I had the correct MAP sensor selected in Sensor ICF. What I was surprised at is they didn't pickup on firmware issue either.

  9. #19
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    But you said, "Did firmware update and same issue." Then you called Holley.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, 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.

  10. #20

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    With V4 same issue with both AEM sensor and Holley MAP sensors. Did firmware update to V5 and AEM sensor would work, Holley sensor would not. Plugged Holley sensor in multiple times no good. The AEM sensor and Holley MAP sensor would not work with old V4 firmware. Hence our thinking that we were dealing with corrupt firmware and a bad MAP sensor. Either way I see light at end of tunnel!

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