WEIRD IDLE PROB?? 500 AND ..........

[marlonvip]

HI

I know the idle issue is big and I have been searching in the forum with no luck:-(

When the car is cold and I start it idles at 1300 and then slowly falling to 500 and then it makes a jumping motion between 500 and 600 rpms???

If I dont do anything it dies and if I start driving before the car is warm it will die the first time I come to a holdt and use the clutch???

For now im ussing the gas pedal to keep the car running and there is no prob. when its varm

timing is 10bdc
new plugs
no codes

sorry for the long post but its driving me crazy:-(

thanks for any thougths
Marlon

 

[rumptis]

So it does this before it warms up?...how soon does the idle drop after you start it up completely cold?

 

[marlonvip]

It drops from 1300 to 550 within a minute or so......

 

[jdub]

Specifically...what plugs (make & part #) and what plug wires are you using?

 

[marlonvip]

NGK WIRES AND IRIDIUM PLUGS

 

[starscream5000]

Maybe it has something to do with the CPS or CSI?

 

[jdub]

Ok...I was hoping for an easy fix. Those are good plugs and wires...actually I was thinking about the connection to the plugs.

First check your timing as shown in the TRSM:
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=IG&Page=20

Next take a look at the TPS:
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=FI&Page=101

The IDL contact in the TPS must be closed for the idle speed system to operate.

To take a look at the ISC valve...take a look at the TRSM on this page:
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=FI&Page=106

Inspect the ISC per what this says. One additional thing...when you shut the car off, the ISC should go full open. Unplug it after shut down and re-start the car...the idle should be high.

This should keep you busy for a bit