LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

engine stays on with key removed,please help!!!

Thread Tools
 
Search this Thread
 
Old 02-26-13, 03:45 PM
  #1  
LBucf10
Driver School Candidate
Thread Starter
 
LBucf10's Avatar
 
Join Date: Feb 2013
Location: ca
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default engine stays on with key removed,please help!!!

hey guys whats up,hopefully someone can give me some insight on this problem.tried searching but got nothing=\

tried turning the car off like normal,removed the key and they engine stayed on!i have no idea why its doing this.the only thing that turns it off is if i crank the starter with the engine already on.

please help!any input would help! thanks
Old 02-26-13, 04:01 PM
  #2  
python
Lexus Champion
iTrader: (4)
 
python's Avatar
 
Join Date: Jan 2008
Location: ca
Posts: 1,840
Received 27 Likes on 25 Posts
Default

ignition switch or unless someone wired something into the ignition system like a fan with a toggle switch.
Old 02-26-13, 04:06 PM
  #3  
YoshiMan
Racer
 
YoshiMan's Avatar
 
Join Date: Mar 2004
Location: Colorado
Posts: 1,367
Received 101 Likes on 92 Posts
Default

I agree. What about the rest of the subsystems tied in with the ignition? like.. the radio, the wipers, ect... do they still work with the key out? If they do, its probably a bad ignition switch failing to cut off the power.

I have seen diesel engines do that, where the shut down solenoid in the injector pump goes bad, and i also have seen carburated gas engines continue running roughly due to carbon buildup in the cylinders, but for an engine with EFI to keep going afterwards would lead me to beleive that its simply a bad switch, as the ECU would still have to be getting the "on" signal to keep the system operating
Old 02-26-13, 05:30 PM
  #4  
cobalt91
Lead Lap
 
cobalt91's Avatar
 
Join Date: May 2012
Location: MI
Posts: 586
Likes: 0
Received 0 Likes on 0 Posts
Default

Maybe the contacts on the key cylinder are corroded.
Old 02-27-13, 01:48 AM
  #5  
LBucf10
Driver School Candidate
Thread Starter
 
LBucf10's Avatar
 
Join Date: Feb 2013
Location: ca
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default

i really appreciate all the input guys.i figured out the problem tho,i don't know why i didn't think of it soon.it ended up being the driver side harness under the fender. 3 of the wires got chewed up and one of them was a all white ignition wire that was touching another smaller wire.fixed them and now everything is back to normal!

thanks again for all the advice!
Old 02-27-13, 06:25 AM
  #6  
YoshiMan
Racer
 
YoshiMan's Avatar
 
Join Date: Mar 2004
Location: Colorado
Posts: 1,367
Received 101 Likes on 92 Posts
Default

Damn mice! Good to know it was such an easy fix
Old 02-27-13, 08:16 AM
  #7  
TaffyK20si
Driver
 
TaffyK20si's Avatar
 
Join Date: Aug 2011
Location: KY
Posts: 112
Likes: 0
Received 0 Likes on 0 Posts
Default

I had a similar problem not too long ago. The car would turn off but my dash lights would stay on. Found some wires in the driver fender harness were rubbed by my tire and were bare. Repaired them and all is good.

I was hoping that it would also fix my previous problem of not having power to my door locks, interior lights, head lights, and trunk popper while the car either wasn't running or switched to ACC. Everything works while car is on. But it didn't solve any of that. I think I've got a bad MPX body network computer.
Old 02-28-13, 02:48 PM
  #8  
LBucf10
Driver School Candidate
Thread Starter
 
LBucf10's Avatar
 
Join Date: Feb 2013
Location: ca
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by YoshiMan
Damn mice! Good to know it was such an easy fix
Yea im glad it was such an easy fix! I should have tucked the harness when i put the coils on but i was lazy=\ oh well its all done now=]

Originally Posted by TaffyK20si
I had a similar problem not too long ago. The car would turn off but my dash lights would stay on. Found some wires in the driver fender harness were rubbed by my tire and were bare. Repaired them and all is good.

I was hoping that it would also fix my previous problem of not having power to my door locks, interior lights, head lights, and trunk popper while the car either wasn't running or switched to ACC. Everything works while car is on. But it didn't solve any of that. I think I've got a bad MPX body network computer.
That's good too hear man,its a pretty easy repair. It sucks you still have some other issues with your car tho=\ hope you get them all sorted out!
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
96ls400no
LS - 1st and 2nd Gen (1990-2000)
3
09-30-23 04:49 PM
mdt525
LX - 1st and 2nd Gen (1996-2007)
19
03-30-15 12:29 PM
Losaun
Performance & Maintenance
8
02-02-12 07:33 PM
choithew
Performance & Maintenance
9
03-23-10 05:37 PM
mac187
GS - 1st Gen (1993-1997)
2
02-17-09 06:12 AM



Quick Reply: engine stays on with key removed,please help!!!



All times are GMT -7. The time now is 02:56 PM.