Sc400 loss of power, runs rich, loud - ClubLexus - Lexus Forum Discussion

Notices
Performance & Maintenance Engine, forced induction, intakes, exhausts, torque converters, transmissions, etc.

Sc400 loss of power, runs rich, loud

Reply

 
 
 
Old 05-15-18, 08:21 PM
  #1  
Braaap1uz
Driver School Candidate
Thread Starter
 
Join Date: May 2018
Location: FL
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Default Sc400 loss of power, runs rich, loud


I recently bought a 92 sc400 and it ran perfect for about 2 weeks before randomly messing up one morning when I tried to start it.
Issues:
Before any major issues, the car randomly stalled at stop lights every once in a while.
Barely wanted to start, cranked and cranked until just barely starting up.
Next, I tried driving down my street and it bogs down when I floor it, but will get up to speed when I slowly accelerate. Drove it around fine, up to 50 mph but like a slug. In first gear it drives pretty nicely, but as soon as I put it in second gear it wonít go above 1k rpm.

So far Iíve tried replacing:
Fuel pump ecu
spark plugs
ignition coils
sent ECU to get fixed.

Right now Iím investigating the camshaft/ crankshaft position sensors. The info Iíve found on symptoms of bad ones matches pretty closely to what issues I have. But Iím not sure whether my issue is cam or crank position sensor.
Iíve also checked the throttle body, itís pretty clean and snaps perfect, opens all the way when floored in accessory mode. After sitting in my garage a few weeks,and turned on a few times it also started misfiring pretty bad when revved up. Sounds like 2 step.
Any help with this would be greatly appreciated

Last edited by Braaap1uz; 08-16-18 at 05:13 PM.
Braaap1uz is offline  
Reply With Quote
Old 08-16-18, 05:07 PM
  #2  
Braaap1uz
Driver School Candidate
Thread Starter
 
Join Date: May 2018
Location: FL
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Bump?
bump?
Braaap1uz is offline  
Reply With Quote
Old 08-16-18, 07:12 PM
  #3  
FatBrian81
Lead Lap
iTrader: (2)
 
FatBrian81's Avatar
 
Join Date: Jan 2011
Location: NC
Posts: 532
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Another user recently posted about a similar issue and found his o2 sensors were bad, it might be worth a shot to check them out.
FatBrian81 is offline  
Reply With Quote
Old 08-17-18, 07:06 AM
  #4  
BlackIRON
Pole Position
 
BlackIRON's Avatar
 
Join Date: Apr 2014
Location: Miami, FL
Posts: 204
Thanked 3 Times in 3 Posts
Default

Any engine codes?
BlackIRON is offline  
Reply With Quote
Old 08-18-18, 04:28 PM
  #5  
xCWolf
Driver School Candidate
 
Join Date: May 2018
Location: MA
Posts: 21
Thanked 5 Times in 4 Posts
Default

I recently posted this, my o2 sensors were black. still haven't replaced them
xCWolf is offline  
Reply With Quote
 
 
 


Thread Tools
Search this Thread
Quick Reply: Sc400 loss of power, runs rich, loud


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

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: