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Thread: All sensors reading wrong.

  1. #1

    Default All sensors reading wrong.

    So the car ran fine last night. Holley HP. Today I started it after running the intercooler lines. And it ran really weird. I checked the laptop and all the readings are all over the place. Voltage and water temp are correct, but MAP, Fuel Psi, Oil Psi are way off. Anybody ever come across this before?

  2. #2
    Join Date
    Dec 2009
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    Connecticut
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    Perform this troubleshooting test: https://forums.holley.com/showthread...0200#post80200 (Related Forum Thread)
    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/3000 RPM converter, FPP aluminum driveshaft, FPP 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 MT tires.

  3. #3

    Default

    Could be a bad sensor ground.

  4. #4

    Default

    I think I fried the sensors. I tacked some brackets on, with the ECU out of the car and the WBO2 sensor out but the sensors still plugged in. Four sensors bad.
    Last edited by lballog; 02-10-2020 at 09:01 PM.

  5. #5

    Default

    Sensors shouldn't go bad from welding, but I suppose most anything can happen. If you have a buddy who has a Holley system, you might be able to try your sensors in his system to see if they're good or not.

  6. #6
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    http://forums.holley.com/showthread....=2760#post2760 (Replacement Sensors For Holley EFI - Auto Parts Store)
    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/3000 RPM converter, FPP aluminum driveshaft, FPP 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 MT tires.

  7. #7

    Default

    They are smoked! Just put a friend's in and it works. Note to self, unplug sensors before welding.

  8. #8

    Default

    Weird deal, I wouldn't think that pressure sensors would be damaged by welding. I think those are piezoelectric sensors and piezoelectric wouldn't be damaged by welding. But it is what it is. Guess you'll learn an expensive lesson since those sensors are about $100 each.

  9. #9
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    Connecticut
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    We use a Matson Antizap here at work, and we've never had a problem since. Keep the ground clamp close to your welding!
    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/3000 RPM converter, FPP aluminum driveshaft, FPP 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 MT tires.

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