Vacuum Lines Causing Low Idle

[viclykewhoa]

I read that a loose vacuum line can cause the low idle that I am experiencing. Approximately 350-400 rpm when stopped at a red light in Drive.

Lex, what do you think?

Where are the vacuum lines?

[SKperformance]

A vacuum leak can cause every possible problem depending on which one it is ,you have about 30 hoses on the engine. They are the black hoses going from part to part.

A low idle problem should be started to troubleshoot by cleaning the throttle body to make sure the iacv is working properly.

[TurboGS300]

Might help if we knew WHAT YEAR GS you had, since there are some differences!

[viclykewhoa]

Might help if we knew WHAT YEAR GS you had, since there are some differences!

←

1999 GS300

[viclykewhoa]

A vacuum leak can cause every possible problem depending on which one it is ,you have about 30 hoses on the engine. They are the black hoses going from part to part.

A low idle problem should be started to troubleshoot by cleaning the throttle body to make sure the iacv is working properly.

←

Thanks SKPerformance. I'm a newbie when it comes to cars so do you know where I could get instructions to clean the throttle body?

I'm trying to learn how to maintain my car myself; I greatly appreciate the relevant comments posted like yours.

[SKperformance]

Do a search in all forums or google as it is not car specific.

There you will find the process of cleaning a throttle body which is rather simple ,usually 2 screws and you can see it then spray the can slowly .

[TurboGS300]

check the TPS as well! <_<

[fonzo91121]

hi everybody,

im having similar low idle issues. 93 gs 300. is there any IMPORTANT i should do before attempting this job of cleaning and where can i find a new seals if mine are bad?

thanks in advance

[StreetLegal-ish3]

My car tends to have a rough idle at red lights... not all the time, just randomly... would that be a loose hose somewhere>/?