L LS400Head New Member Apr 14, 2010 #1 My 1996 LS400 - When my car is running at Idle The RPMS go up and down up and down. before this was Happeinning my car ran like silk Do I need a new Timing Belt ? 175,000 miles
My 1996 LS400 - When my car is running at Idle The RPMS go up and down up and down. before this was Happeinning my car ran like silk Do I need a new Timing Belt ? 175,000 miles
Thermactor Member Apr 14, 2010 #4 LS400Head said: what is ISC ? Thanks for your time Click to expand... It's the idle speed control valve. Back when I owned a Supra, oscillating idle could have also been caused by a bad throttle position sensor, so that's worth checking out as well.
LS400Head said: what is ISC ? Thanks for your time Click to expand... It's the idle speed control valve. Back when I owned a Supra, oscillating idle could have also been caused by a bad throttle position sensor, so that's worth checking out as well.