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My 1997 LS400 will start but then shut off HELP

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Old 10-10-05, 11:32 AM   #1
jazspot
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Default My 1997 LS400 will start but then shut off HELP

I have a 1997 Lexus Ls400 i just bought, the car has 68k on it. When i go to crank it it will start run for a few seconds and then shut down like you are cutting off the power, Some times it takes a ton of turnning to get it to go some times it fires right away but reguarless it runs for only a few seconds. you can rev it to 7k or gradually accelerate or let it idle but you got about 3 seconds of running
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Old 10-10-05, 01:53 PM   #2
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It could be the fuel pump ECU. We SC owners have the same symptoms and it generally turns out to be our fuel pump ECU.
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Old 10-10-05, 02:39 PM   #3
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Quote:
Originally Posted by CK6Speed
It could be the fuel pump ECU. We SC owners have the same symptoms and it generally turns out to be our fuel pump ECU.
Where is located ? would it be the same from a 1993 as i have a 1993 parts cars
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Old 10-11-05, 02:03 AM   #4
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maybe it is the plug for the airflow meter. Check to see if it is in place.
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Old 10-11-05, 06:44 AM   #5
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check your airfilter to see if its clogged, if thats good i would suspect the sparkplugs, wires or the fuel is being restricted either by the fuel filter,the fuel regulator, the injectorscould be clogged and theres remote possibility that your pump isdefective but i doubt that. also you might want to try putting some fuel injector cleaner in your tank i recommend the b-12 chemtool which you can get in any auto store. try thjese things and let us know what happens
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Old 10-11-05, 09:14 AM   #6
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I will try that. I have b-12 in there but i do not think it runs long enough to do anything. I also check the wires and the seem good the plugs i replaced today still no change. the fuel pump is good
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Old 10-11-05, 09:29 AM   #7
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Quote:
Originally Posted by jazspot
I will try that. I have b-12 in there but i do not think it runs long enough to do anything. I also check the wires and the seem good the plugs i replaced today still no change. the fuel pump is good
you cant really tell ifthe wires are good just by looking at them. another thing is to make sure you dont have any vacuum leaks, listen uder the hood and see if you can hear any hissing sounds when the car is on. if you keep your foot on the gas will the car still cut off?
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Old 10-11-05, 10:38 AM   #8
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I doubt VERY seriously if it is basic maintenence. Plugs or wires would be more erratic and allow the car to run but poorly. Yours starts and runs and then dies. That is electrical or possibly the fuel pump itself. Before throwing parts and money at the problem check for codes. Check fuel pressure.
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Old 10-11-05, 11:21 AM   #9
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Quote:
Originally Posted by jbrady
I doubt VERY seriously if it is basic maintenence. Plugs or wires would be more erratic and allow the car to run but poorly. Yours starts and runs and then dies. That is electrical or possibly the fuel pump itself. Before throwing parts and money at the problem check for codes. Check fuel pressure.
if the fuel filter or the pump is not delivering enough fuel this would make the car start and then die. if he has a vacuum leak that would also cause the carto start and die if the leak is bad enough.
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Old 10-11-05, 02:36 PM   #10
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Car has 86lbs of fuel pressure when key is on. No matter what you do it cuts off after a few seconds You can hold the gas to the floor or let it idle you have between 2-3 seconds. It is like some one pulls the plug from a vacum instant shut down. then as soon as the car stops it will start back up again and do the same thing. No vaccum lines looked touched or altered
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Old 10-11-05, 03:57 PM   #11
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one thing to look at is the Idle Air Control valve. had this problem in my mom's sienna where it would continuously start and die.
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Old 10-11-05, 07:35 PM   #12
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Quote:
Originally Posted by jazspot
Car has 86lbs of fuel pressure when key is on. No matter what you do it cuts off after a few seconds You can hold the gas to the floor or let it idle you have between 2-3 seconds. It is like some one pulls the plug from a vacum instant shut down. then as soon as the car stops it will start back up again and do the same thing. No vaccum lines looked touched or altered
i seriously doubt that you have 86lbs of pressure that is way too high. if the car wont stay on while reving then forget all the other stuff puredrifter might have aq point it could be your IACvalveor you tps might need to be adjusted
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Old 10-12-05, 02:25 AM   #13
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Sounds very much like a bad MAF or something related. Possibly ECU of course as well.

Bad TPS, IAC, O2, IAT none of that will cause it to start then shut off especially if you have it floored and it acts the same.
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Old 10-12-05, 02:25 AM
 
 
 
 
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