Fast Idle Speed on a 6.5 Turbo Hummer
High Output Alternator Article
Updated September 23, 2007
Use this info to get a fast idle speed on any Hummer 6.5L electronic injected "drive by wire" turbo diesel between 1996 and 2003.
Just a quick note. To get a high idle on a 6.5 N/A diesel activate the cold fast idle.
Most manufacturers recommend around 1100 RPM for extended idle periods on diesel engines to prevent carbon deposits. This is particularly handy for warm up (heater) cool down (AC) as well as being easier on the engine if extended idle times are required. I have an array of high power lights I like to leave on when setting up camp in the dark. The lights will eventually drain the battery if the truck is at normal idle.
Directions
- Remove the glove box. Actually you may want to remove the whole doghouse.
- Remove the center connector by squeezing the connector locks and pulling it out.
- Remove the lock on on top of the connector which corresponds to row B. A is the top row & B is the bottom row. The bottom row is on the flat side.
- Crimp one or two depending on number of speeds desired 18 ga. wire(s) to a terminal pin (you must supply a pin, p/n12089649) available at any GM dealer for each cavity since they are now empty. Use a Packard Electric crimp tool (p/n 6285847). This tool is available from Pioneer-Standard Electronics @ 1-800-PACKARD. We also found the pins at Pepboys auto (5 for 3.50).
- Insert the pin that will be connected to switch #1 with the attached 18-ga. wire in cavity B7 (the 7th hole from the right in the back, "wire side") Insert the pin that will be connected to switch #2 with the attached 18-ga. wire in cavity B8 ( the 8th hole from the right in the back "wire side") Make sure the terminal pins lock into the connector, now reinstall the connector in the PCM.
- Attach wire(s) to a switch (user furnished) connected to chassis ground.
- 1070 RPM- ground pin B8
- 1360 RPM-ground pin B7
- 1600 RPM- ground both B7 and B8
Note: The Fast idle will revert to base idle when the brake is pressed or if the selector is put into gear. The fast idle will resume when the shifter is put in park or neutral.
