99 D1 with High Idle

L

Lucabra

Member

Jan 25, 2018

9

2

Upstate NY

• Feb 5, 2018

• #1

I have a 99 D1 with a high idle upon start up , it pegs at 3000 RPM for a minute and then idles down to normal after it warms. Recently changed Cats and O2 sensors. Thought it was Idle Control Valve, changed that out no change...Any Idea's ?

 

colvere

Well-known member

Sep 3, 2004

100

0

56

Filer, ID

• Feb 5, 2018

• #2

I just took mine to a local shop and he reset adaptive values and all is good again. Mine was same issue

 

4Runner

Well-known member

May 24, 2007

662

111

Boise Idaho

• Feb 5, 2018

• #3

I would check your TPS. Maybe move it around see what changes. Maybe set your base idle. You could also have a vacuum leak that your IAC has to compensate for. Look at your hoses carefully. Is your oil filler cap on tight. Is the prong in good shape? That’s where I would start. Probably vacuum first and tps second. Good luck.

 

R

robertf

Well-known member

Jan 22, 2006

4,786

360

-

• Feb 5, 2018

• #4

I wrote some software you can find here to reset the adaptive idle, but any time mine has done this it was after I reattached the battery and it had a poor connection.

 

L

Lucabra

Member

Jan 25, 2018

9

2

Upstate NY

• Feb 6, 2018

• #5

Thanks for the Idea's , I'm going to give them a shot.

 

R

Ryeguy02

New member

Sep 3, 2017

3

0

Canada

• Feb 23, 2018

• #6

My 98 was doing the same thing. Tried changing several sensors and nothing. Pulled out the ecu and it was rusted like crazy. Changed it out with another one and problem was solved.