Idle Adjustment?

[phicho]

Where is the idle adjustment? I recently installed a 160 thermostat and now the idle is fast. Unless I am putting my foot into it and repeatedly into boost the temp is at 160 or less, particulaly when the outside temp is cool. This is according to the temp guage. I wonder if the ecm thinks engine is cold and is in the fast idle warmup mode. Stock 84 with 126,000 miles, runs good. Do I need the 160 degree thermostate or should I run stock? This is a great site. Thanks to all of the seniors who take the time to reply to us new guys and answer the same questions over and over.

 

[BRAD_PADGETT]

The idle is controlled by the ecm. The idle air control valve probably needs adjustment which can only be correctly done with a scan tool. This is the torx screw next to the TV cable on the throttlebody. So a search on the adjustment procedure. Brad

 

[phicho]

Thanks Brad! Another question.

Do I need the 160 thermostat, or should I stick with factory? Can the cooler thermostat cause the fast idle?

 

[BRAD_PADGETT]

I would switch to a 160 thermostat and it has no effect on idle. Brad

 

[phicho]

What can the idle rpm to increase?

 

[BRAD_PADGETT]

What can the idle rpm to increase?

Start with adjusting the IAC correctly. I would also look for any vacuum leaks and exhaust leaks pre turbo at the same time. Brad

 

[RegalT-type85]

160 thermostat is for power, 180 mid, stock 192 is to help MPG. I have used them all, I'm sticking with 180.


Take your pick.