shoob
New Member
- Messages
- 32
- Location
- ATL GA USA
ok, where to start?
8-18-12:
i picked up my first ls400 about a month ago, its a 93' loaded with every option available. about 240k miles. cars trac light was on when i bought the car, but the car ran and drove perfect with zero issues.
one day leaving my house i pull to a stop sign, and it starts missing, and skipping like its gonna cut out. it everytime itd miss, the CEL would illuminate. but, it straightened out after just a few seconds, and proceeded to drive normally.
fast forward a week..... it did it again, twice in the same trip, same scenario. cleared up, CEL went off, its been fine.
fast forward to this pass week. i left out of town on a business trip, and my wife was using the car to commute 7 miles to work and back. wednesday morning she goes out to start the car. it starts.....runs 5-6 seconds and dies. all while the CEL and "trac off" button illuminate, and stay on. she repeated the process 3-4 times with the same result. she calls me, i tell her to drive her car until i get back in town and can check it out.
a little background...... ive been dealing with toyotas for 15 years now, from carbbed to obd1 and all in between. forced induction, nominal aspiration, fuel injection, you name it. franken-swaps, tuning, building.......its all in the resume.
this thing has me stumped.
i get home go out, start the car and it hesitated for a few seconds, and self sustained its idle. mind you the trac off light and cel are still on at this point. i press the accelerator...holy balls, no responce, slow revving with slight popping out the exhaust. its richening up to the point you can smell the gas fumes permiate from around the vehicle. so i sit there puzzled and let it run for a few. it dropped idle from 1k to 800, and both lights went off. drove the car, it was fine.
we go out to dinner, get 27 miles from home and it starts again. mind you again, the car cruises 90mph at highway speeds with no ill manner. we eat get back in the car.......starts again.
at this point im irritated. so i grab a paper clip and do the neccesary procedures to pull obd1 codes.....nothing. rapid solid flash, no codes. wtf. it clears up, and we drive home. at this point, ive disconnected the trac unit plug, and turned trac off, ect sport mode......no issues.
we get home and decide to go out and hit the redbox. this time im driving, and the issue happens, starts missing hard, looses all power and i limp into the quick trip. as im turning into a parking spot, the car dies.
okay, so sitting in the parking lot. i check everything, maf hose, maf connection, coil connection, all throttle body components, tap on the IAC......nothing. start it up, same thing.
so i start it a few times......suddenly, it races to 2k, stays there and every now and then drops intermitantly to 1k, only to race back up. i shut it down, check coolant,and allow the car to cool, again checking codes, nothing.
after 30 minutes car starts up, no miss, no lights, and runs fine.
on the way home, starts again.
i get home, final attempt to pull codes, this time pulling abs trans and trac codes.......
nothing on the cel, still.
trac is throwing a 43
abs is throwing an 18
any light to shed here?
update: 8-19-12
ok....after about an hour of troubleshooting, a few choice words and being violated in my ear by the parts store........i found a few things.
the passenger bank main coil wire, feeding the cap, was laying on the timing belt. no damage done, but it did skin back a little rubber.
i got the car to sustain idle long enough to start pullin plugs. my brother swung by to help diagnose..... we pull every plug reachable while the engines running, trying to narrow down the issue.
again at this time, still not throwing codes.
we pull the idle air control valve.......CEL goes out as well as the trac off light, then it starts rapidly idle surging. call the parts store for a price....this is when i got ear raped when i heard $595.99 for the idle air control valve....
plugged it back in, no issues. no trac light, no CEL. headed to the parts store to grab a can of intake cleaner.
that wasnt it......ran fine in the driveway, the minute i started to drive, the problem came back.
its wierd. 1 minute it will idle fine and have a severe acceleration stumble. the next minute it will idle at 2k simultaneously dropping for milliseconds intermitantly, then shoot back to 2k.
now unplugging the IACV does nothing...
still will not flash a code to me with te1 and e1 jumpered. but will show me trac and abs codes when jumping their pins.......
WTF?
finally got the cel to throw codes at me.......i used this that i found, and it seemed to work, by using the 'troubleshooting method".
http://www.justanswer.com/lexus/2kmv...ing-began.html
24- AITS signal (air intake temp sensor)
31- AFM SIGNAL
71-EGR system malfunction
i unplug the MAF while the cars running, and it runs the same as before. shut the car off, plug it in, its fine. looks like im on the hunt for a MAF.
oh, and now my speedo quit working.......
and now im only getting:
CEL- 31
TRAC- 43
ABS- 18
im guessing the previous code 71 came from me having the egr valve unplugged simultaneously right before performing the troubleshooting diagnostics (TE2 and E1 jumpered while running, driving)
i cleaned the AFM sensor, and that seemed to get rid of code 24 (AIT sensor)
still cant find what trac code 43 is, or abs code 18. i know my pad wear indicator is showing, so im guessing abs 18 is related to that, because i cant find any other info.
i figured out that i trashed the MAF by trying to clean it......so:
update: 8-21-12
the engine is acting like, either the timing isnt advancing with rpm's, or the spark is getting weaker as velocity and fuel is increasing in the chamber, so im pointing at the coils at this point. i had a car previously, that had the same type issue. ran fine, till it got to operating temp, then once warm would stall, couldnt put the engine underload, etc. basically the same behavior.
ok, so i replaced the MAF.......nothing. even bought a junkyard spare, tested before install, specs out....nothing. skimmed the harness back off the MAF connector all the way back into the main harness, all wires solid and in tact.
bought a coil.....tested on both sides, not it.
put in a CTS, just because theyre only $20....didnt help.
changed plugs, just because, didnt help.
now no matter what, it will not give me a CEL, no matter what i try to do. how likely is it, that the 93 ls400 ecu's go out? the check engine light will not come on sometimes, and other times it acts as if its got a short in it, rapid flashing, no certain tempo.
also , ive looked pretty good without tearing the engine further apart, where are the main harness grounds attached to the engine? im about to trace grounds, just to see if i have a weak or bad ground somewhere causing irratic behavior.
also note, in the beginning, when it would change idle and the CEL would come on, my passenger back injectors would click loudly.
ive jumpered b+ to fp in the diag box, and im getting fuel flow, so i know its not the pump.
please help!!
8-18-12:
i picked up my first ls400 about a month ago, its a 93' loaded with every option available. about 240k miles. cars trac light was on when i bought the car, but the car ran and drove perfect with zero issues.
one day leaving my house i pull to a stop sign, and it starts missing, and skipping like its gonna cut out. it everytime itd miss, the CEL would illuminate. but, it straightened out after just a few seconds, and proceeded to drive normally.
fast forward a week..... it did it again, twice in the same trip, same scenario. cleared up, CEL went off, its been fine.
fast forward to this pass week. i left out of town on a business trip, and my wife was using the car to commute 7 miles to work and back. wednesday morning she goes out to start the car. it starts.....runs 5-6 seconds and dies. all while the CEL and "trac off" button illuminate, and stay on. she repeated the process 3-4 times with the same result. she calls me, i tell her to drive her car until i get back in town and can check it out.
a little background...... ive been dealing with toyotas for 15 years now, from carbbed to obd1 and all in between. forced induction, nominal aspiration, fuel injection, you name it. franken-swaps, tuning, building.......its all in the resume.
this thing has me stumped.
i get home go out, start the car and it hesitated for a few seconds, and self sustained its idle. mind you the trac off light and cel are still on at this point. i press the accelerator...holy balls, no responce, slow revving with slight popping out the exhaust. its richening up to the point you can smell the gas fumes permiate from around the vehicle. so i sit there puzzled and let it run for a few. it dropped idle from 1k to 800, and both lights went off. drove the car, it was fine.
we go out to dinner, get 27 miles from home and it starts again. mind you again, the car cruises 90mph at highway speeds with no ill manner. we eat get back in the car.......starts again.
at this point im irritated. so i grab a paper clip and do the neccesary procedures to pull obd1 codes.....nothing. rapid solid flash, no codes. wtf. it clears up, and we drive home. at this point, ive disconnected the trac unit plug, and turned trac off, ect sport mode......no issues.
we get home and decide to go out and hit the redbox. this time im driving, and the issue happens, starts missing hard, looses all power and i limp into the quick trip. as im turning into a parking spot, the car dies.
okay, so sitting in the parking lot. i check everything, maf hose, maf connection, coil connection, all throttle body components, tap on the IAC......nothing. start it up, same thing.
so i start it a few times......suddenly, it races to 2k, stays there and every now and then drops intermitantly to 1k, only to race back up. i shut it down, check coolant,and allow the car to cool, again checking codes, nothing.
after 30 minutes car starts up, no miss, no lights, and runs fine.
on the way home, starts again.
i get home, final attempt to pull codes, this time pulling abs trans and trac codes.......
nothing on the cel, still.
trac is throwing a 43
abs is throwing an 18
any light to shed here?
update: 8-19-12
ok....after about an hour of troubleshooting, a few choice words and being violated in my ear by the parts store........i found a few things.
the passenger bank main coil wire, feeding the cap, was laying on the timing belt. no damage done, but it did skin back a little rubber.
i got the car to sustain idle long enough to start pullin plugs. my brother swung by to help diagnose..... we pull every plug reachable while the engines running, trying to narrow down the issue.
again at this time, still not throwing codes.
we pull the idle air control valve.......CEL goes out as well as the trac off light, then it starts rapidly idle surging. call the parts store for a price....this is when i got ear raped when i heard $595.99 for the idle air control valve....
plugged it back in, no issues. no trac light, no CEL. headed to the parts store to grab a can of intake cleaner.
that wasnt it......ran fine in the driveway, the minute i started to drive, the problem came back.
its wierd. 1 minute it will idle fine and have a severe acceleration stumble. the next minute it will idle at 2k simultaneously dropping for milliseconds intermitantly, then shoot back to 2k.
now unplugging the IACV does nothing...
still will not flash a code to me with te1 and e1 jumpered. but will show me trac and abs codes when jumping their pins.......
WTF?
finally got the cel to throw codes at me.......i used this that i found, and it seemed to work, by using the 'troubleshooting method".
http://www.justanswer.com/lexus/2kmv...ing-began.html
24- AITS signal (air intake temp sensor)
31- AFM SIGNAL
71-EGR system malfunction
i unplug the MAF while the cars running, and it runs the same as before. shut the car off, plug it in, its fine. looks like im on the hunt for a MAF.
oh, and now my speedo quit working.......
and now im only getting:
CEL- 31
TRAC- 43
ABS- 18
im guessing the previous code 71 came from me having the egr valve unplugged simultaneously right before performing the troubleshooting diagnostics (TE2 and E1 jumpered while running, driving)
i cleaned the AFM sensor, and that seemed to get rid of code 24 (AIT sensor)
still cant find what trac code 43 is, or abs code 18. i know my pad wear indicator is showing, so im guessing abs 18 is related to that, because i cant find any other info.
i figured out that i trashed the MAF by trying to clean it......so:
update: 8-21-12
the engine is acting like, either the timing isnt advancing with rpm's, or the spark is getting weaker as velocity and fuel is increasing in the chamber, so im pointing at the coils at this point. i had a car previously, that had the same type issue. ran fine, till it got to operating temp, then once warm would stall, couldnt put the engine underload, etc. basically the same behavior.
ok, so i replaced the MAF.......nothing. even bought a junkyard spare, tested before install, specs out....nothing. skimmed the harness back off the MAF connector all the way back into the main harness, all wires solid and in tact.
bought a coil.....tested on both sides, not it.
put in a CTS, just because theyre only $20....didnt help.
changed plugs, just because, didnt help.
now no matter what, it will not give me a CEL, no matter what i try to do. how likely is it, that the 93 ls400 ecu's go out? the check engine light will not come on sometimes, and other times it acts as if its got a short in it, rapid flashing, no certain tempo.
also , ive looked pretty good without tearing the engine further apart, where are the main harness grounds attached to the engine? im about to trace grounds, just to see if i have a weak or bad ground somewhere causing irratic behavior.
also note, in the beginning, when it would change idle and the CEL would come on, my passenger back injectors would click loudly.
ive jumpered b+ to fp in the diag box, and im getting fuel flow, so i know its not the pump.
please help!!
Last edited:
