L-Jet idle too fast

[gdpedersen]

My 85 graduate has an idle problem I'm trying to resolve and I would appreciate any advise.

At start up when its cold, the idle is a nice, stable 900 rpm, but as it warms up the idle starts to creep up. When its fully warm it's turning about 1300 rpm. I've adjusted the set screw on the throttle body, but if I use that to set the warm idle, the cold idle is too slow.

The maunal shows another adjustment where a hose from the hard rubber intake sleeve connects to the plenum, but this doesn't seem to do anything. Maybe I haven't backed it off far enough yet? Is there something else I'm missing?

Thanks for any help!
Gene

[Greg Gordon]

May I humbly suggest you pay a visit to my site here: http://www.hiperformancestore.com/Ljetspider.htm

Three of the sharpest people on this board took an old GTV6/Milano article I wrote and adapted it to the Spider for just this situation.

Good Luck,
Greg

[gdpedersen]

Hey Greg.
Thanks for the great article. It's very clearly written and illustrated.

I read through most of it and I think I'll start with the "donut" in the idle speed adjustment in the plenum (then go through the complete procedure when time premits). That adjustment in my car was screwed all the way into the plenum. Is the donut just a standard O-ring I can get anywhere or is a special part I will need to order? Thanks again for your help.

Gene

[BlackAlfa]

Quote:

Originally Posted by gdpedersen At start up when its cold, the idle is a nice, stable 900 rpm, but as it warms up the idle starts to creep up. When its fully warm it's turning about 1300 rpm. I've adjusted the set screw on the throttle body, but if I use that to set the warm idle, the cold idle is too slow.

[ghnl]

Quote:

Originally Posted by gdpedersen Is the donut just a standard O-ring I can get anywhere or is a special part I will need to order?