Rough idle
#1
Rough idle
Hi, 99celcior here. I drive a 99 ls400 and Bin having a rough idle lately, the car seems to drive fine but at idle I could feel a little bit of a shake I went ahead and did a tune-up on the Car. spark plugs and coil on spark plug boots. Changed my motor mounts found out they were cracked. change the transmission mount. Still had a rough idle so then I change the ocv solenoids with no change. Thought I had bad gas so I ran the tank empty and refueled ran injector cleaner through it. No check engine lights are on I look for vacuum leaks, no leaks. Still rough. if anyone out there has any ideas let me know, thank you
#4
Sounds like the blockage of air mix passages. Those can't be cleaned simply. You need a full can of cleaner or more and a good air compressor. The link below may help you to understand how you use a compressor.
https://www.clublexus.com/forums/ls-...w-ac-on-3.html
https://www.clublexus.com/forums/ls-...w-ac-on-3.html
Last edited by Yamae; 10-29-16 at 08:26 AM.
#6
So I cleaned the tb today and before I started, i wrote down the fuel trims. both banks long term was -4% at idle, and -0.5 around 2k rpms... after a can of tb cleaner and blowing commpresed air through the 2 ports on top tb... rough idle is still there but long term fuel trims are different .
idle..
bank1= -3.2
bank2=-0.8
2k rpms
bank 1=-0.8
bank2=2.3
I'm thinking I need to clean some more. the rough idle seems to be a little better but still there. if any one has an idea on this please let me know thanks
idle..
bank1= -3.2
bank2=-0.8
2k rpms
bank 1=-0.8
bank2=2.3
I'm thinking I need to clean some more. the rough idle seems to be a little better but still there. if any one has an idea on this please let me know thanks
Last edited by 99celsior; 10-30-16 at 07:43 PM.
Trending Topics
#9
Hi, 99celcior here. I drive a 99 ls400 and Bin having a rough idle lately, the car seems to drive fine but at idle I could feel a little bit of a shake I went ahead and did a tune-up on the Car. spark plugs and coil on spark plug boots. Changed my motor mounts found out they were cracked. change the transmission mount. Still had a rough idle so then I change the ocv solenoids with no change. Thought I had bad gas so I ran the tank empty and refueled ran injector cleaner through it. No check engine lights are on I look for vacuum leaks, no leaks. Still rough. if anyone out there has any ideas let me know, thank you
Thread
Thread Starter
Forum
Replies
Last Post
Dennzo
GS - 2nd Gen (1998-2005)
8
12-06-11 04:49 PM