Question about 1990 Chevrolet K1500

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Every now and then when I apply my brights or turn my radio on , my check engine will pop on for a brief moment accompanied by a miss in the engine. Engine seems to miss a cycle then run normally. In addition when driven and stopped at a light the Voltage indicator will bounce between 12-14 volts. I notice a slight flicker in the dome/headlights as well during idle. Maybe be related, Radio has a high pitched electrical sound thats proportional to teh rpm of engine with poor to little reception in most areas. Possible bad ground but not sure if faults are related.

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Faults are definetly related, and all of these symptoms can come from a poor ground as you say, and/or a faulty (intermitttent) regulator. This is part of the alternator that regulates the voltage at 13.8-14.2v at idle to ensure adequate voltage to all sytems and to charge the battery.

Due to the age of the vehilce, I would be suggesting an alternator replacement, incuding a clean up of all engine and body ground circuits.

Posted on Oct 08, 2010

  • dylan_abendr Oct 09, 2010

    Can I get a ball park figure on say time/price of what It would cost for a shop to replace the alternator clean/check all engine and body ground circuits?


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First you should have your charging system checked, since your voltage light is coming on. THe charging sysem will rarely produce a misfire. Those chevy are know for many reason for misfire. HAve that system check by a tech to avoid spending unnecessary money.

Posted on Oct 08, 2010

  • Luke Bradford
    Luke Bradford Oct 10, 2010

    It would be hard to provide you with a ballpark figure, as times/labour charges (hourly rates) differ from shop to shop.....I would suggest going to 2-3 different shops and asking them for a quote, and choose not the cheapest one, but the one that you made a connncection with or felt comfortable talking to...........



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