pakiman626

iTrader: (1)

so my lexus just quit running on me and dont understand y. i have both spark and fuel. the car recently just passed emissions less then two week ago so definetly no CEL recently . so something **** out on me randomly. turns over perfect, sometimes even sputtering like it is about to start. but nope nothing. all interior lights windows lock etc.. all are still working

so far ive

replaced fuel pump
replaced efi relay
doing the spark plugs first thing in the morning.

so after doing this im done throwing parts it. need to know if anyone has a similar story. have read for the past four hours about other similar stories nothing is similar to this seeing as how i have both spark and fuel..

my assumptions. descending in which makes sense to me
1) security shut down
2)bad fuse or relay that ive missed
3) key chip isnt registering or is bad
4)ecu went bad
5)bad gas
6)a sensor going bad that isnt providing enough spark???

i dunno its just a weird scenario my head is about to explode ive been reading on this for so long.
please help me figure this out guys, im sure someone else in the future will run into this again. also if someone could take a picture of the fuse box underneath the glove box i would apreciate it my dog recently decided to chew it up....thanks cl

AMSMIKE

iTrader: (40)

if you have spark and fuel. my guess your starter is bad. check the starter wire. make sure its getting power while cranking.

if it was the key. you would get no response from the ecu. you can rule that one out.

AMSMIKE

iTrader: (40)

what happens when you do 2 clicks on the ignition with the key? do you hear the pump prime?

then when you try and crank...what happens?

GS4_Fiend

iTrader: (22)

Is the timing belt still good? maybe jumped a tooth? the car suddenly just did that or did you had any work done then the car started to do that?

AMSMIKE

iTrader: (40)

^^^ could be.

we need more info OP. I want to know what happens when you prime the pump. (2 clicks). Then try and start the car. what happens? what noises? does the car try and do anything? do the dash lights dim?

pakiman626

iTrader: (1)

pump is def priming, the car is cranking continously and trying to start but just not happening thaks for such fast replys cl. checking timing it seems on point.

pakiman626

iTrader: (1)

how could the starter be bad if it is turning over properly?

pakiman626

iTrader: (1)

dash lights are not dim, the only weird noise i heard would be that the etcs hummed for a lil then stopped and then i tryed to start again and it didnt make any noise

AMSMIKE

iTrader: (40)

how is it turning over properly? you said the car wont start.

you never made it clear that anything happened when you tried turning the key over. thats why I re-asked the questions.

you need 2 things....fuel and spark. if you have both and car wont start....could be a few things. cam angle sensor, timing is off, bad gas, not enough voltage.

pakiman626

iTrader: (1)

o ok, wasnt trying to be rude just didnt know if there might be something else running off it something all high tech and weird lexus might like to do. i have also been using a jumpbox to try and get it to start so i think ill go buy a cam angle sensor, drain all the gas, and check timing again.. thanks again for the help man and ill post what happens tomorrow

AMSMIKE

iTrader: (40)

wait....you are using a jumper box?

is your battery dead?

whats your voltage at the battery WITHOUT the jumper box hooked up...and everything turned off?

whats your voltage at the battery WITHOUT the jumper box hooked up...when you are cranking (trying to start the car) ?

pakiman626

iTrader: (1)

the battery it self did die at one point and would not crank

Busha

It could be the key! I tried starting my car one time with my key that wasn't programmed and it just kept turning over but it wouldn't start. Try the key first 😁

clos430

iTrader: (21)

What do you mean by " it just quit on you " Where you driving and it just shut off also how did you check the timing ? Make sure you have compression on all cylinders before you dump more money on guessing

Chin

iTrader: (34)

To rule out security. With no key in the ignition, the security light on the dash should blink. When you insert the key, the light should go out. How many miles on your car and do you have an aftermarket alarm? Are all your warnng lights coming on when the key is turned to the ignition position? If you have access to a scanner, can you communicate with the cars computer via the diagnostic port? This will help rule out the cars computer but not totally. Did you check your crank sensor? Throwing parts at it is the wrong thing to do...