Idle in Park is 1,800 RPM....Idle in gear in 900 RPM...Way too High.
Well, I'm trying to fine tune my holley 4160 (600cfm) and I have ended up with my idle in Park as 1,800 RPM (which is screaming) but then when I drop it in to gear in goes down to 900 RPM. Why the big change?
I guess my goal for both is 900 RPM in Park and in gear....any thoughts?
The only other info I have is that I opened the secondaries a bit to try and get a stronger idle, but that should be the same in park and in gear. Unless.....Because I had a faster idle with the secondaries open, I kept backing off the curb idle screw to lower the idle speed and now when I put it in gear, it almost wants to stall.
So...is it safe to say that the problem would be solved if I close my secondaries a bit and crank my curb idle screw up again (which I was trying to avoid) and maybe my idles would even out? Or is there a bigger problem here?