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1991 Lexus LS 400 Warning Lights when accelerating
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mainogre
Novice
Mar 4, 2012, 2:01 AM
Post #1 of 10
(3379 views)
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1991 Lexus LS 400 Warning Lights when accelerating
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hi, I own a 1991 Lexus LS 400. When i accelerate every warning light turns on (oil, battery, traction control, coolant, e-brake, engine). When i decelerate they all turn off. When idling they are all off. Only when i accelerate is when they turn on or at high speeds of 50mph+. I did just replace the battery about 1 month ago. Any help would be greatly appreciated.
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speed
User
Mar 5, 2012, 9:43 AM
Post #2 of 10
(3302 views)
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Re: 1991 Lexus LS 400 Warning Lights when accelerating
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have the codes read at your local parts store, autozone, advanced auto, o'rileys, they will be able to scan the engine codes. you also may watn to think about just takin it to a reputable shop to begin with, this is a difficult thing to diagnose over the internet and not actually being there
GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 5, 2012, 10:10 AM
Post #3 of 10
(3299 views)
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Re: 1991 Lexus LS 400 Warning Lights when accelerating
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Just a thought on this - check all engine to body grounds especially with the battery replacement one or more could have been disturbed?
T
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mainogre
Novice
Mar 6, 2012, 2:29 AM
Post #4 of 10
(3283 views)
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Re: 1991 Lexus LS 400 Warning Lights when accelerating
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Well the morning after I posted the original message, i went to start my car and it was dead........ Last night I noticed there was battery acid dust around the positive connector. I cleaned it off, then jumped my car. I drove the car for about 7 miles with no problems (no warning lights and car ran fine, it didn't want to die). I even sat in a McDonalds drive-thru for 10 minutes at idle. I parked it at home and went to bed. In the morning, the car was completely dead........ Since my car wasn't dying on the road while driving it, wouldn't that mean I have a bad battery? Thanks for the help.
(This post was edited by mainogre on Mar 6, 2012, 2:30 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 6, 2012, 2:54 AM
Post #5 of 10
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Re: 1991 Lexus LS 400 Warning Lights when accelerating
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You'll have to test the battery out AFTER charging it. This going dead is killing it. Check what may have been damaged by battery acid and replace the corroded cable then check it out. May have a drain going on too which is also hard on battery and charging system,
T
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mainogre
Novice
Mar 6, 2012, 2:57 AM
Post #6 of 10
(3272 views)
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Re: 1991 Lexus LS 400 Warning Lights when accelerating
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thanks I'll give it a try and let ya know within the next few days.
BTW what causes a battery drain anyways? a loose connection?
(This post was edited by mainogre on Mar 6, 2012, 3:00 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 6, 2012, 7:54 AM
Post #7 of 10
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Re: 1991 Lexus LS 400 Warning Lights when accelerating
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Battery drain could be lots of things like a short of something or something is staying on that shouldn't like even a glove box or trunk light. In that your symptoms were when accelerating when engine would tilt a bit normally on it's mounts and now the corroded battery terminal something is up IMO.
When a regular lead-acid battery is low the chance of spitting acid around is up there and wiring of things near that would need inspecting. That load on the alternator to charge it back up even if enough amps left to start is hard on both battery and alternator. You can end up needing both and power surges can wreck control modules which you don't want either.
Just recently (retired long time now) jumped a family vehicle with interior lights that had been left on so dead as a door nail. Left my vehicle and the dead one hooked up so both were charging a hopelessly dead battery but got it going and 20 minutes later stopped as both alternators were red hot. Just by feel couldn't keep a hand on either and don't get hurt by moving parts if you try that. Got that car to my shop to charge with charger instead of letting alternators do it and so far so good that neither burned anything out.
If you don't have or get even a floating low amp battery charger ~$21 or so AND there's a simple device that just gives you exact digital voltage that just pushes into any cig lighter or power port - neat as you can see the real voltage and how much it drops when an item is turned on. I like that better than trusting a gauge and for vehicles with just a warning light it can give you advance warning of a problem. Cool gadget for the ~$12 bucks!
Not everything for basic care costs that much and you can use it again on another.
In that you think battery should be good (sometimes they get dropped in handling and rendered NG) before you got it you may need some added testing and can short inside and self drain by themselves.
Some may need some help to determine that or a parasitic draw/drain elsewhere,
T
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mainogre
Novice
Mar 7, 2012, 9:23 PM
Post #8 of 10
(3244 views)
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Re: 1991 Lexus LS 400 Warning Lights when accelerating
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hey tom thanks for all the help. So today i had the battery tested and it came back ok. i bought one of those cigarette lighter voltage meter things and hooked up my charged battery and turned the car on. The voltage was way too high. 17.5v. so would that mean my alternator is stuck on? ive also heard that it could mean that the voltage regulator needs to be replaced. i know some regulators are built inside the alternator and some are on the outside. if it were on the outside i would like i could fix that? thanks again.
(This post was edited by mainogre on Mar 7, 2012, 10:17 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 8, 2012, 4:48 AM
Post #9 of 10
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Re: 1991 Lexus LS 400 Warning Lights when accelerating
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I'm tired - sorry but if you see 17.5 volts your alternator is NOT regulated and will cause damage to about anything in this car,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 8, 2012, 4:54 AM
Post #10 of 10
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Re: 1991 Lexus LS 400 Warning Lights when accelerating
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New alternator
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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