Bogging under Acceleration when warm
05-11-10, 11:36 PM
#1
Bogging under Acceleration when warm
Been having this never ending battle for the last year.
SC400 is bogging sometimes under load (50%? or more throttle) when its warm or near warmed up.
Runs better when its cold
Wastes gas like no other.
Occasionally get MAIN O2 Sensor code even after replacing both 2 times... it still comes on.
Rotors, Cap, Wires, Coils, Plugs were done recently, 2 years ago I got a new coolant temp switch.
Any ideas?
Matt
SC400 is bogging sometimes under load (50%? or more throttle) when its warm or near warmed up.
Runs better when its cold
Wastes gas like no other.
Occasionally get MAIN O2 Sensor code even after replacing both 2 times... it still comes on.
Rotors, Cap, Wires, Coils, Plugs were done recently, 2 years ago I got a new coolant temp switch.
Any ideas?
Matt
05-12-10, 02:25 AM
#3
Lexus Test Driver
iTrader: (7)
Join Date: Oct 2006
Location: SoCal & SLOcal
Posts: 927
Likes: 0
Received 0 Likes
on
0 Posts
Would you know what those O2 codes are for? Too lean? Too Rich?....etc...
If not, get your hands on a wideband and see where your afr's are at under different loads and rpms. Knowing what end condition set off your O2 codes will help.
If I had to take a guess, I would say check ecu and maf.
Good Luck Matt,
David
If not, get your hands on a wideband and see where your afr's are at under different loads and rpms. Knowing what end condition set off your O2 codes will help.
If I had to take a guess, I would say check ecu and maf.
Good Luck Matt,
David
05-13-10, 03:45 PM
#6
Lexus Test Driver
iTrader: (7)
Join Date: Oct 2006
Location: SoCal & SLOcal
Posts: 927
Likes: 0
Received 0 Likes
on
0 Posts
So essentially your problem arises when the car goes into closed loop...when it starts reading information from the O2 sensors.
Check out this thread:
https://www.clublexus.com/forums/per...mely-rich.html
It's worth a shot and it definitely helped me out.
Check out this thread:
https://www.clublexus.com/forums/per...mely-rich.html
It's worth a shot and it definitely helped me out.
05-15-10, 08:40 PM
#7
Interesting, I already replaced it once due to a completely failed ECU... However, white smoke, I thought it was vapor in the exhaust, really rich under idle... I hate to even do it, but I will try my friends ECU on my car and see...
If its really the ECU again... MS3 for me.
If its really the ECU again... MS3 for me.
Thread
Thread Starter
Forum
Replies
Last Post
