Question about 1991 Lexus LS 400

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Transmissdion when brakes are appiled the reverse light on dash light and rpms jump up?

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Leaky break booster ,air line valve ect.for rev problem

Posted on Jan 05, 2009

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Many things cause rpms to fluxuate. I.e. dead miss due to faulty or failing spark plug or plug wires. Or any of the ignition components is the ck engine light on dash flashing when rpms "jump"? This will tell you wether or not the problem is a miss

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GM actually did something that I thought was rather clever in the '90's. Whenever one of my rear light bulbs would burn out, I would lose my dash lights. I suggest that you check all your rear lights, brake lights & reverse included as well as turn signals. Start with regular tail lights, that's what was always burnt out on mine. I sure hope this is the problem. I was so glad when it was something that simple on mine.
Good Luck! Let me know, OK? I would like to know how I'm doing, too.
Thanks so much! I like to start with the simple things, instead of jumping to $$
from the start.

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Dash lights come on when I press the brake peddle


Sounds as if your getting a back feed. Most likely from the brake light bulbs (part number 1157). Take out the brake light bulbs and see if the dash lights still come on when you step on the brakes. If so check the lead contacts on bulbs, sometimes they get squished/corroded and jump both contacts, replace bulbs with new and recheck. Hope this helps.

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