Anybody offer any suggestions? Engine is a .060 over 455. Installed a Holley Sniper and it runs like a 455 should, BUT idles like it has a high lift cam (it doesn't). No vacuum leaks, pertronix ignition and fresh plugs and wires. Pleased with everything but the idle.
What kind of idle AFR is your target? What AFR is the system reporting at idle? What kind of IAC counts are you getting with the car hot and in park/neutral? Are you using the Sniper to control timing?
After installing the Sniper I had to adjust the target idle speed and the throttle blade adjustment a couple of times before I got it to where both I and the engine seemed happy. Bob THROTTLE BLADE ADJUSTMENT Once engine has warmed up above 160 degrees the throttle blade angle can be set. It is critical for the engine to be above 160 degrees F before setting the throttle blade angle. From the Home screen, Select the Tuning Icon. Then Select Basic and then the Basic Idle Icons. This will allow you to set your basic Engine Idle Speed when engine is up to temperature. Select the desired idle by sliding the slider to desired value and press Save. With the engine running, Select “Monitors” tab from the main menu, then select the “Multi-Gauge” tab, then the “Sensors” tab. In the lower left hand corner “IAC Pos,%” will be displayed. This value needs to read between 2-10% with the engine running at idle in park without an AC on, if equipped. If the value is 0 the blades need to be closed until it reads between 2-10%, if the value is higher than 10% the blades need to be opened until it reads between 2% and 10%. Once the value is between 2%-10% for the desired idle RPM the throttle blade angle is set correctly. While adjusting the blades to the correct IAC Position %, the TPS reading may change. This is normal and after an ignition power cycle the TPS will read zero again.
Thanks bob for the detailed information. What did end up for idle rpm? My engine is stock all the way from cam to ignition.
Same here - stock except for Sniper. I set the idle at 650 RPM which is smooth and gives a nice burbling exhaust note. Cheers Bob
