Need emissions help.........
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New User
Joined: Sep 2003
Posts: 15
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From: Phoenix Az
Need emissions help.........
I have a 1970 F100 with a 360, went to emissions today and failed the CO idle test. Everything else passed. I need 5.00 but I got a 6.52, I have changed the plugs, plug wires, dist cap, rotor, checked all vaccum lines, set the timing to 6 deg BTC and changed the thermostat and cleaned the radiator. I guess the only thing left is my lean and air adjustment on my carb and I have no idea on how to do that....any suggestions?????
Posting Guru
Joined: Dec 2002
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From: peoria, az
Need emissions help.........
Originally posted by BigBlueFord
turn each idle air adj screw in (cw) untill it just starts to run rough, then back out (ccw) about a turn and a quarter. Do one at a time and it should solve it.
turn each idle air adj screw in (cw) untill it just starts to run rough, then back out (ccw) about a turn and a quarter. Do one at a time and it should solve it.
I wouldn't go that far(back out). I turn them in till rough then come back out 1/4 at a time (both sides) just enough to smooth it out.
New User
Joined: Jan 2008
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Need emissions help.........
I usually tuen them in until the engine runs rough >
Then go CCW >count the revolutions until the engine runs rough again > and splitting the difference turn it back in.
If the screw turns CCW 1 1/2 from rough idle to rough idle
.
It gets turned back CW in 3/4 of a turn.
Then go CCW >count the revolutions until the engine runs rough again > and splitting the difference turn it back in.
If the screw turns CCW 1 1/2 from rough idle to rough idle
.
It gets turned back CW in 3/4 of a turn.
Posting Guru
Joined: Dec 2002
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From: peoria, az
Need emissions help.........
That's too much work. Just back them out until it smooths out. By turning them in, you get it lean enough to miss , then open them up until it quits missing and you are set..
meeseaz, where are you at? bring it by and I'll set it up for you.
meeseaz, where are you at? bring it by and I'll set it up for you.
Mountain Pass
Joined: Apr 2002
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Need emissions help.........
I also find with carb adjustments, it's good to make a quarter turn and then give the engine time to settle out, like 10 seconds. Don't turn the screw and expect to stop when the engine smooths out, you've probably gone too far at that point. Quarter turn, take a break, quarter turn, take a break...
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Senior User
Joined: Mar 2002
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From: La Canada, CA
Need emissions help.........
For emissions test, Stepman's advice is right on. When I was required top have a smog test in California, I even set the distributor tiiming to 0 degrees. Once I've passed the test, I then would drive home and re-set everything to best running conditions.
During my learning stages, several times during a smog test, my low emissions were too high. I just turned the idle screws inward another 1/4 turn right on the spot which cured the problem.
During my learning stages, several times during a smog test, my low emissions were too high. I just turned the idle screws inward another 1/4 turn right on the spot which cured the problem.
Elder User
Joined: Mar 2002
Posts: 609
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From: Watauga TEXAS
Need emissions help.........
Originally posted by gedteach
You did not mention oil change. Fresh oil makes a difference in emissions. Good Luck TC
You did not mention oil change. Fresh oil makes a difference in emissions. Good Luck TC
That will put you over the top.
Joe
