Changing the gas filter?
#16
Lexus Fanatic
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Originally posted by VSsc400
also changed PCV valve. (1992 SC400) simple to do and brough the idle to exact 700rpm with no surge and started seeing better gas mileage.
also changed PCV valve. (1992 SC400) simple to do and brough the idle to exact 700rpm with no surge and started seeing better gas mileage.
#17
Lexus Champion
Join Date: Oct 2001
Location: el clinico magnifico
Posts: 3,417
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
If your idle goes up to 1500 or 2000 rpm, there is a problem and that IS NOT normal. Changing the PCV valve will not solve this problem either. The PCV valve allows air from the valve covers to enter the intake. All air taken into the engine is measured at the MAF (mass airflow sensor). If air is getting into the engine some other way, there may be a vacuum leak. Make sure all the vacuum lines are hooked up and that the tubes are not cracked.
You should clean your throttle body and air bypass valve too. If that doesn't work, maybe it is the throttle position sensor that is going bad, just like the GS.
Additionally, does the 1500-2000 rpm occur all the time or only when the engine is being started in the morning? My car idles that high for a few minutes when it is cold, but after that, it is around 600 rpm...that is normal.
You should clean your throttle body and air bypass valve too. If that doesn't work, maybe it is the throttle position sensor that is going bad, just like the GS.
Additionally, does the 1500-2000 rpm occur all the time or only when the engine is being started in the morning? My car idles that high for a few minutes when it is cold, but after that, it is around 600 rpm...that is normal.
Last edited by LB Lex; 11-18-02 at 04:26 AM.
#18
Lexus Fanatic
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Originally posted by 93LexoGS300
Additionally, does the 1500-2000 rpm occur all the time or only when the engine is being started in the morning? My car idles that high for a few minutes when it is cold, but after that, it is around 600 rpm...that is normal.
Additionally, does the 1500-2000 rpm occur all the time or only when the engine is being started in the morning? My car idles that high for a few minutes when it is cold, but after that, it is around 600 rpm...that is normal.
Thread
Thread Starter
Forum
Replies
Last Post
mattward70
LS - 1st and 2nd Gen (1990-2000)
4
12-16-06 09:02 PM
DroppedGS
GS - 1st Gen (1993-1997)
7
02-09-04 05:04 PM