HIGH RPM's at Idle-PLEASE HELP

[noremacsupra]

Hello,
Yesterday i was driving/racing my 90 turbo just around the neighborhood and then i noticed that suddenly my car would idle higher than normal. Before it idle at 650-800 now it idles 1200-1450. The next morning it idle fine but as soon as i started running it again it kicked to high rpms at idle. Also, after starting the car when the engine is warm/hot - it idles normally but after a few seconds the RPM'S go higher again.

Thanks for the help.
Noremac25


1990 Toyota SUPRA Turbo MT (stock engine-short ram air intake only)

 

[noremacsupra]

PLEASE HELP ANYONE>>>>checked for any leaks and no codes. Checked isc, throttle body all good..

 

[Blackfin]

Sounds like a bad ISC. Here is a link on how to check it. make sure you check it when it is idling high.

http://www.cygnusx1.net/supra/librar...fi/FI_106.html

 

[Jaguar_5]

Have you checked the simple things? Like see if the throttle cable is sticking somewhere

 

[Burntz]

Have you checked the simple things? Like see if the throttle cable is sticking somewhere

It only does it when warm, meaning its probably not the throttle cable.

Most likely its your ISC that is malfunctioning when it gets hot. Electronics do that alot.

 

[noremacsupra]

Thanks...the website u posted does not open,it has an error...

Sounds like a bad ISC. Here is a link on how to check it. make sure you check it when it is idling high.

http://www.cygnusx1.net/supra/librar...fi/FI_106.html

 

[noremacsupra]

It idles fine when just started. then when i start driving it it goes up...thanks..

It only does it when warm, meaning its probably not the throttle cable.

Most likely its your ISC that is malfunctioning when it gets hot. Electronics do that alot.

 

[noremacsupra]

i checked nothing is sticking out..do u have an specific place?

Have you checked the simple things? Like see if the throttle cable is sticking somewhere

 

[mk3_dude]

vacumm leaks? aft. BOV?

 

[Aspec]

i checked nothing is sticking out..do u have an specific place?

Have you recently tried to set your timing or messed with the air screw on the throttle body?

 

[noremacsupra]

uhm no...where is the air screw?

Have you recently tried to set your timing or messed with the air screw on the throttle body?

 

[mk3 for life!]

my tps connection was loose and it did the same thing, when it is idling high, try LIGHTLY wiggling the connector, just a thought.

 

[noremacsupra]

ok will check that..thanks...how do u adjust the throttle body late?

my tps connection was loose and it did the same thing, when it is idling high, try LIGHTLY wiggling the connector, just a thought.