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Alternater voltage high 18+

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Offline airdale navy

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Alternater voltage high 18+
« on: July 29, 2010, 07:36:04 PM »
I'm have a problem with the 1.6 8V in my 91 sidekick.Its idling rough and running rough still about 2500 rpm then it seem to smooth out .I have put a new fuel filter .TPS , fuel injector (used) .35 PSI fuel pressure.New O2 sensor. CTS Checks out .IAT checks out. No vacuum leaks or exhaust leaks.Changed MAP (used) Tried a different  coil .Change the distributor.(used)New cap,rotor,wire.I recently rebuilt the engine .The only thing I found is the alternator voltage is 18 + volts. Could high voltage make it run rough?
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91 sidekick,8v,sky 1.5 lift,235 tires,full synthetic oils !GM alternator upgrade.Ford Mustang coil.4DR front brakes.
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Offline airdale navy

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Re: Alternater voltage high 18+
« Reply #1 on: July 29, 2010, 07:38:56 PM »
No codes.
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91 sidekick,8v,sky 1.5 lift,235 tires,full synthetic oils !GM alternator upgrade.Ford Mustang coil.4DR front brakes.
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Offline wildgoody

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  • Turbocharged 150HP 1.6L 8V 93MPH 1/4 mile
Re: Alternater voltage high 18+
« Reply #2 on: July 29, 2010, 07:39:48 PM »
Ya, could fry computer parts too, as well as feeding too high
voltage as reference signals for the sensors
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Offline fordguy79

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Re: Alternater voltage high 18+
« Reply #3 on: July 30, 2010, 05:53:29 AM »
Over charging well boil your battery and get acid on every thing I wound change it before I would start it again  till you change the altenator
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87sami 32" bfg mt 6.5:1 w/reverse S shifter  1.6 16v sold and missed
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Offline airdale navy

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Re: Alternater voltage high 18+
« Reply #4 on: July 31, 2010, 07:58:42 AM »
Bad volt meter reads 3.5 volts  higher than  should.Autozone checked the alternater Checked good.I will Start a new post I will have to reset TPS and recheck all the sensors.Any ideas would be helpful.
« Last Edit: August 01, 2010, 06:05:40 AM by airdale navy »
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91 sidekick,8v,sky 1.5 lift,235 tires,full synthetic oils !GM alternator upgrade.Ford Mustang coil.4DR front brakes.
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