Hunt for idle issues
Thread Starter
Instructor
Joined: Dec 2003
Posts: 129
Likes: 0
From: Tyler Tx
Hunt for idle issues
Just took the car back and had the tuner adjust it but it is not much better, is it in the tune, should they be able to adjust it out, I have been told it was an easy.
Would be grateful for any additional advise, it's about 100 miles back to my tuner.Car runs great other than this! it was fine until they installed the cam -224/228
Thanks
Would be grateful for any additional advise, it's about 100 miles back to my tuner.Car runs great other than this! it was fine until they installed the cam -224/228
Thanks
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Increase idle air in the running airflow table from 400-1200rpm. It will steady it. I had that cam in 2 cars and other than the shake it runs fine.
Air leaks cause a raised steady idle at 1200-1400 rpm. It is because there is too much air. Hunting for idle means there isnt enough. Its gasping.
Air leaks cause a raised steady idle at 1200-1400 rpm. It is because there is too much air. Hunting for idle means there isnt enough. Its gasping.
Safety Car
Joined: Jun 2004
Posts: 3,563
Likes: 2
From: Dallas Tx
A shortcut way around it is drilling holes in the throttle blade. The professional way to correct it is in the tuning tables, needs more idle air.
The same thing used to happen on old carbureted hot rods. Put a wild cam in there and have all kinds of idle problems. I can't tell you how many Holley carbs I've seen with holes drilled in the throttle blades. Lets you get the throttle blade closed to the proper idle position in relation to all the fuel ports and still allow more air. The same trick works with FI, however it's a backyard approach. A real good tuner should be able to fix it in the tuning tables.
The same thing used to happen on old carbureted hot rods. Put a wild cam in there and have all kinds of idle problems. I can't tell you how many Holley carbs I've seen with holes drilled in the throttle blades. Lets you get the throttle blade closed to the proper idle position in relation to all the fuel ports and still allow more air. The same trick works with FI, however it's a backyard approach. A real good tuner should be able to fix it in the tuning tables.
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Safety Car
Joined: Dec 2004
Posts: 3,565
Likes: 5
From: stafford country, va. Avatar: Me on turn 3 @ Bristol (The World's Fastest Half-Mile)
you could also have a loose plug wire. it would run fine above idle but at idle the intermintent spark could cause it to hunt.