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91 LS400 Wont go past 4,000RPM

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Old 04-28-11, 09:21 AM   #1
Hilux22RE
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Default 91 LS400 Wont go past 4,000RPM

Hello fellow LS400 Owners!

I Have a 1991 LS400 and i noticed something odd...

I Rarely get on the Gas seeing as Gas prices are 4.69 a Gal

But today i stepped on the gas hard and my LS will not go past 4,000 RPM...

If anyone has had the same problem can you please help??

greatly appreciated.. i will post a Vid up in a few...

http://www.youtube.com/watch?v=d2gyzlU54vc <---- Link to my RPM Fault..
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Last edited by Hilux22RE; 04-28-11 at 09:33 AM..
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Old 04-28-11, 09:34 AM   #2
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tune up time?
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Old 04-28-11, 09:37 AM   #3
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I Just Changed:

Motor Oil
Oil Filter
Spark Plugs
Wires
Distributor Caps
Ignition Rotors
Fuel Filter
Transmission Fluid
Transmission Filter

I Hope its not the transmission...
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Old 04-28-11, 11:12 AM   #4
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How does the car run otherwise? Does it idle normal? (600 RPM) It looks like the RPM started at 300. At the begining it does sound that it has a skip or the fuel/air mixture isn't right.
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Old 04-28-11, 11:37 AM   #5
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It Idles under 600..

But it runs Fantastic!

No shaking or Sputtering it is smooth.
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Old 04-28-11, 01:42 PM   #6
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check dist rotors, ignitors, coils, and the TPS.
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Old 04-28-11, 03:00 PM   #7
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Should i change Both Primary and Secondary TPS??
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Old 04-28-11, 11:32 PM   #8
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I dont think theres anything wrong with the car
im assuming the ect was not in power mode
and since it sounds like your a generally relaxed driver the ect has learned your style

if you want it to be able to rev fully, reprogram your ect

Quote:
Originally Posted by Lexkost View Post
Now to the ECT reprogram, It is very simple and to be done on freeway ramps...Turn off AC, car must be in 3rd gear ( out of overdive) and turn on ECT make sure that light is on the dash.
From dead start floor it and keep it floored until it runs throught all three gears, and do this about the 6 times , it can be done in a few days and you should notice that the RPM's should start to raise on shifts.........after awhile the trans will shift well into the red line ( only when in ETC mode ) but in regular mode the car will shift much better than before.
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Old 04-29-11, 10:59 AM   #9
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I am going to try that today and follow through to tomorrow and hope it fixes it!

Thanks!
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Old 05-05-11, 11:38 PM   #10
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Any Luck on this?
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Old 05-05-11, 11:38 PM
 
 
 
 
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1991, 2000, 400, 4000, 450, es300, fast, gs, lexus, light, ls, ls400, overdive, past, rev, rpm, shift, wont

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