Question about 1993 Lexus Ls 400

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1993 LS 400. Starting out the car just is slow. It's not the tranny. Tranny shifts perfect including reverse. I smell gas. Old lady drove car the whole time. 118,000 miles

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  • Lexus Master
  • 880 Answers

IF WHAT YOU SMELL IS RAW GAS THAT IS AN URGENT PROBLEM THAT SHOULD NOT BE PASSED OVER. IF YOU SMELL A ROTTEN EGG SMELL THEN YOU MIGHT HAVE A CATALYTIC CONVERTER PROBLEM THAT GIVES POOR ACCELERATION. CHECK FOR FUEL LEAKS AND CHECK FOR ENGINE VACUUM AT IDLE. MUST BE AT LEAST 19 INCHES,. IF NOT, YOUR CONVERTER IS PLUGGED.

Posted on Apr 09, 2015

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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dennymulford
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SOURCE: 2002 dodge gran caravan es 3.8

spend 15.00 and try tranx in it its worth a shot you can get it at auto zone

Posted on Feb 24, 2009

  • 14036 Answers

SOURCE: unkown 4l60e installed code 1860?

PO-1860 IS TORQUE CONVERTER CLUTCH PULSE WIDTH MODULATOR SOLENOID CIRCUIT.WHAT ITS SAYING THAT TCC SOLENOID IS DAMAGE OR IT HAS FAIL.SOLENOID IS OPEN NOT WORKING.

Posted on Jun 09, 2009

Blackberry_U
  • 223 Answers

SOURCE: tranny clunks when shifting gears

Your gears may be going. I would get it checked out.

Posted on Jun 15, 2009

  • 2 Answers

SOURCE: i have 3.8L the tranny down shifts hard when

Check your ATF fluid level. Your MAP lets your TCM know when to shift which in turn tells your solenoid pack to get the fluids flowing in the proper channels. This shifts it down, etc. ...or something very similar to this chain of events. When your fluid level is low, there isn't enough to go through all the channels and you can get air in there- which compresses. This situation causes it to behave just as you described. The jargon aside, you are the proud owner of a very temperamental transmission. Congratulations you lucky guy!
The best thing you can do for your tranny is to keep the fluid clean and full. I would recommend dropping the oil pan of the transmission and then replacing the 4 quarts or so that came out with ATF-4. Do this yourself and it will be better in the long-run. Most shops will put the wrong type of fluid in your transmission and shorten the life of it as well as give you a rough tranny in the meantime.
If you have not performed any transmission service to this vehicle before, I would get a new transmission filter and pan gasket. Also get about 8 quarts of ATF-4 while you are at the parts store. These should all be in stock. You may only use 4 quarts now, but you will want to have some on hand for the next partial change.
This is just as easy as changing your oil- just make sure that nothing has dirt or old gasket material on it when you put it back together. Also, use a new funnel or one that is already designated for ATF when pouring in the new fluids.
If your old fluid is really dark red and burnt smelling, you will need to do the other 4 quarts in 1000 miles.
Make sure you use ATF-4. Your tranny originally came with ATF-3, but Chrysler dicontinued it. ATF-4 is fully synthetic and will work better. Be prepared to pay $4.50-5.50 per quart. The folks at the part store may try and sell you Dexron-III or some other additive nonsense, but don't go for it. Stick to ATF-4 and you won't have issues. The other stuff is thicker and gums up your temperamental tranny. It is not equivalent.
Good luck

PS I am not a mechanic, but I have the same vehicle, have rebuilt my own A604 and also diagnosed and repaired the electrical side of it recently.

Posted on Jul 24, 2009

  • 154 Answers

SOURCE: my 1990 accord ex tranny has a shift problem. it

change the fluid. if that dnt help i have a used trans for sale mrgoodwrench1984@yahoo.com

Posted on Mar 04, 2011

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1 Answer

I have a 1993 LS400. Bought it from original owner(old lady). When I start off its very slow but when it gets going it's fine. Tranny shifts perfectly


Randy, I would stay where you are unless you want power at take off. IMO that consumes more gas. So, if you want more power, you might want to consider a tune up. Do you know when it was last done? Besides, regular servicing is also very important. Good luck.

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Reverse is the first to go, You might try to replace the fluid and the filter in the tranny, But will more then likely tell you you need a rebuild your tranny. The bands in the tranny ware out and rev, is usually the first to go. It will get worse, This is not cheep nor is a easy fix. You can find you another tranny at a salvage yard for $300-400 And will cost at least $400 to instal. With no warrenty.Best advise i can give is overhaul. Best of luck to you on it.

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Have you checked your transmission fluid lately?
More often then not that is the cause of shifting problems. Normally this happens gradually which is to be expected since transmission leaks are usually slow. The first signs are a slight hesitation when the car is first started in the morning and put in reverse. The the car seems to lag just a bit before moving back. This increases as more fluid is lost.
Another cause is from the transmission not being properly serviced. Leave the tranny fluid in to long and it becomes burnt. At this point it the viscosity is more like cooking oil instead of transmission fluid.

Most people neglect this item because of a lack of understanding about the transmission system. As opposed to the engine that everyone knows NO Oil =No Car. Although the service interval is greater when compared to the engine oil it needs to be taken care of to prevent "No Car" also.

Check your tranny fluid. Open the hood and located the tranny fluid dip stick. Usually along the firewall. Read what it says because normally the car needs to be running and in neutral to get an accurate reading.

Also look and smell the oil on the stick. If it's brown and/or it smells like it's burnt have the tranny serviced. This involves draining the fluid, replacing the filter and new fluid.


I hope this helps and good luck.

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They do have a tendancy to pop a ball out of the High and reverse clutch giving this symptom.

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