360 FE High Idle When Not In Gear
#1
10-11-2014, 11:34 PM
Join Date: Oct 2014
Posts: 19
Likes: 0
Received 0 Likes
on
0 Posts
360 FE High Idle When Not In Gear
Little before and after so far on the clean up in the engine compartment. Little degreaser and elbow grease. New valve cover gaskets, paint, filter, air cleaner gasket, and new fuel filter about to go in. Gonna wrangle in those wires tomorrow
Anywho, Hey all. New two week old(to me) 1975 f-100 running great except for this one problem. Engine is a 360 automatic trans. Vehicle starts up fine, drives great. However, when I'm not in gear it has a very high idle. Where would all of you start on diagnosing the problem, and what are some possible causes?
#3
10-12-2014, 11:42 AM
Join Date: Oct 2014
Posts: 19
Likes: 0
Received 0 Likes
on
0 Posts
Awesome. I'll have to look at that when I get home. Now, does this idle control also control the idle when in park and neutral? My truck idles fine right now when in gear(D, R, 1, 2) but when put in park or neutral, RPMs shoot up abnormally high.
#4
10-12-2014, 12:00 PM
The idle speed adjustment screw essentially controls how much fuel is being delivered when your foot is not on the pedal (park, neutral, stop light). It does not affect performance when you are traveling. There is some interplay between idle speed and idle fuel mixture. If your idle speed is off too much, you may need to adjust fuel mixture once you get the idle rpms in the right range. Sometimes folks set the idle speed too high to compensate for poor tuning. If you're going to own an old truck, you should probably do a google search on tuning a carb. There are a number of ways to do it. I prefer a tach and a vac gauge.
#5
10-12-2014, 12:08 PM
Join Date: Oct 2014
Posts: 19
Likes: 0
Received 0 Likes
on
0 Posts
The idle speed adjustment screw essentially controls how much fuel is being delivered when your foot is not on the pedal (park, neutral, stop light). It does not affect performance when you are traveling. There is some interplay between idle speed and idle fuel mixture. If your idle speed is off too much, you may need to adjust fuel mixture once you get the idle rpms in the right range. Sometimes folks set the idle speed too high to compensate for poor tuning. If you're going to own an old truck, you should probably do a google search on tuning a carb. There are a number of ways to do it. I prefer a tach and a vac gauge.
I both love and loathe tuning carbs. Depends on the mood I'm in. I'll definitely pick a vac gauge up soon. Used to work on small engines a lot, I'll have to transfer some of that knowledge to this. Thanks for the help guys
#6
10-12-2014, 06:43 PM
Mountain Pass
these are not computer controlled vehicles, they will ALWAYS idle higher in park or neutral. now if its really high, you are probly out of adjustment. put a tach on it and see where youre idling. a good rule of thumb for me has been around 1000 rpm in neutral or park. should drop it into a nice spot around 600-700 in gear.
Thread
Thread Starter
Forum
Replies
Last Post