jazspot

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

CK6Speed

iTrader: (1)

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.

jazspot

Where is located ? would it be the same from a 1993 as i have a 1993 parts cars

STR8-UP-G

maybe it is the plug for the airflow meter. Check to see if it is in place.

sha4000

iTrader: (1)

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

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

sha4000

iTrader: (1)

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?

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.

sha4000

iTrader: (1)

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.

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

PureDrifter

iTrader: (10)

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.

sha4000

iTrader: (1)

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

DoubleWhoosh

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.

Eunit925

I have same car and same exact symptoms please let me know how u fixed the problem!!???? Thanks

Lexusheadr

I HAVE THE EXACT SAME ISSUE! How did you fix this someone please email me the answer my email is johnjohndirtbike@gmail.com. Also the guy I got it from was driving it on the emergency wallet key so I’m thinking of having a transponder key made please help ASAP