Go Back  ClubLexus - Lexus Forum Discussion > Lexus Model Forums > LS Models > LS - 1st and 2nd Gen (1990-2000)
Failing engine, maximum speed of 3000 rpm and red exhaust, what can be? >

Failing engine, maximum speed of 3000 rpm and red exhaust, what can be?

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

Failing engine, maximum speed of 3000 rpm and red exhaust, what can be?

 
Old 09-01-14, 11:15 AM
  #1  
bazzarello
Driver School Candidate
Thread Starter
 
Join Date: Jun 2013
Location: São Paulo
Posts: 10
Likes: 0
Received 0 Likes on 0 Posts
Default Failing engine, maximum speed of 3000 rpm and red exhaust, what can be?

Hello,

When I bought my 1993 LS400 had some problems, including the engine failing, panel lights flashing, rotating no more than 3000 rpm, and a strong smell of sulfur and exhaust turning red.

He was appointed to replace the capacitors (as post https://www.clublexus.com/forums/ls4...pacitor-3.html).

However, before I start this service, bought another ECU used and exchanged by the former. The car returned to work perfectly. I used it for 6 months and had to keep it for a while.

Now, after three months with the car off and discharged battery, again presented the same problem. So did maintenance as above, replacing the capacitors with a specialist. But the problem remains.

I know to change the ECU again problems will be solved. But does anyone know how to avoid this problem? I need help.

Thank you all.

(Sorry for the english, I'm using online translator)
bazzarello is offline  
Old 09-01-14, 12:10 PM
  #2  
RA40
Super Moderator
iTrader: (6)
 
RA40's Avatar
 
Join Date: May 2003
Location: California
Posts: 18,813
Received 110 Likes on 101 Posts
Default

Can you get any error codes? If the ECU capacitors were replaced with the correct ones, the ECU would not be the problem unless the PCB was damaged.

We can make suggestions but throwing parts at it is going to be costly. Not knowing the past history some usual items that contribute to the car running properly are:
ECT-engine coolant temp sensor
Crank shaft position sensor
O2 sensors
Vacuum lines
Tuneup items like plugs, caps rotors, ignition wires and checking that the ignition coils are functioning.
RA40 is offline  
Old 09-01-14, 12:45 PM
  #3  
bazzarello
Driver School Candidate
Thread Starter
 
Join Date: Jun 2013
Location: São Paulo
Posts: 10
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks for the reply RA40!

I'll get this information with the mechanic and I will post.
bazzarello is offline  
Old 09-01-14, 03:17 PM
  #4  
PureDrifter
BahHumBug
iTrader: (10)
 
PureDrifter's Avatar
 
Join Date: Aug 2004
Location: California
Posts: 23,904
Received 41 Likes on 37 Posts
Default

8/10 times this is an ignition or timing issue. the red exhaust indicates fuel not being burned properly.
PureDrifter is offline  
Old 09-03-14, 01:37 PM
  #5  
bazzarello
Driver School Candidate
Thread Starter
 
Join Date: Jun 2013
Location: São Paulo
Posts: 10
Likes: 0
Received 0 Likes on 0 Posts
Default

Hello PureDrifter, thanks for the response.

The ignition problem you say is related to cables, coils, etc.?

The starting is normal. After starting the car is failing and no more than 3000 rpm. An important detail, when replacing the ECU everything back to normal.

Is there any security system in the ECU? If yes, how to reset?

Thank you.


Originally Posted by PureDrifter View Post
8/10 times this is an ignition or timing issue. the red exhaust indicates fuel not being burned properly.
bazzarello is offline  
Old 09-03-14, 02:34 PM
  #6  
python
Lexus Champion
iTrader: (4)
 
python's Avatar
 
Join Date: Jan 2008
Location: ca
Posts: 1,795
Received 17 Likes on 15 Posts
Default

ohm ur coils out..
python is offline  
 


Thread Tools
Search this Thread
Quick Reply: Failing engine, maximum speed of 3000 rpm and red exhaust, what can be?


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: