Question about 1991 Buick Roadmaster

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Volt meter drops from 14 to 13 volts while driving and the car runs sliggish after it has been drove for more than 10 mins.check engine light has not come on and I have replaced the coilmodulerotorwire set spark plugs and distributor cap

Posted by Anonymous on

5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

shadtremonky
  • 353 Answers

SOURCE: 1997 Buick Park Avenue Ultra. Replaced battery,

recheck your body ground may have surface rust on bolt, body, or connection

Posted on Aug 21, 2009

Carburetor1
  • 32 Answers

SOURCE: i have a check engin light with code #p1635pd mod

that code has to do with voltage there are four circuits that have to have five volts ( egr , fuel tank, throttle postion sensor, and Map sensor) unfortuatatly you need a scan tool to test for this and it is a 12 step process you could be replacing the egr valve map sensor fuel tank pressure sensor map sensor or throttle postion sensor or the PCM which is the computer. but to know which one you need the scan tool instead of throwing money at it. sometimes also they trip on accident if you get a voltage surge like changing the battery. so if it where me I would take it to your local autoparts store and have them clear the code they have a scan tool and will do it for free if it was a power serge it wont come back if it comes bake you will need the scan tool to find which component is bad.

Paul
www.carburetorexchange.com

Posted on Sep 02, 2009

  • 583 Answers

SOURCE: Will not charge

you will get some funny answers from some of these "experts " The symptoms suggest to me with out much doubt that the regulator is not doing its job correctly ,consistently.Iwould take it to an AUTO ELECTRICIAN and get it tested in situ.... there is only 4 things it can be , wireing ---battery---alternator-----regulator and of those the reg. is the only one that chops and changes. it will cost little for a sparky to check the reg ,. AND I WOULD LIKE TO KNOW THE OUTCOME

Posted on Oct 22, 2009

jsmes1027
  • 749 Answers

SOURCE: when the Jeep was new the volt meter read 14

Generally the standard voltage should be 13.5 to 15.5 depending on the load that is being put on the vehicle and age of the battery an older battery may require more voltage to charge. Unless the voltage drops below 13 you are probably ok.

Posted on May 28, 2010

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Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.

I would take the alternator off and take it to oyur local auto parts store to be tested. If bad, replace it and charge the battery fully before starting. Then check voltage at battery with motor running. Should be 13.2 -14 Volts DC. If not, you may have a bad battery cable or blown fusible link. (especially that if the alternator tests good).....Mike

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Check for bad connection to the battery. Use a volt meter to check voltage from alternator to the battery, should be 14.5 volts to 15 volts. If you have anything less than that then look for a bad alternator wire from alternator to battery. Also check for a good ground connection to the battery. Do all the testing with everything off inside the car so you will not have a power drain from the system. hope this will help you.

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the voltage regulator is in the computer,check you battery with volt meter with engine off it should say 12volts then check it again with engine running and it should say 14-15 volts. if not the you will have to take it to a dealer to check the computer,hope this will help you!!!

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bad alternator possible or bad battery..even though its new that battery can be bad. I would take a volt meter and with the engine running check the volts of the battery..If the volts are 12 you need to replace alternator, if volts are 14 you need to check the battery. to check the battery hold the volt meter to the battery and have someone start the car..while the starter is cranking battery volts should not drop below 10volts.if they do your battery is bad.

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Dies while driving


First off, add a new ground wire from the engine to the body just for the hell of it. Now clean all the battery cable connetors aat all point and add WD40 afterwards. Also check connectors from dash panel to engine circuits. This is real suspect. WD 40 them also

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