cold start system 91 4.9 6cyl
Thread Starter
|
Junior User
Joined: Nov 2004
Posts: 54
Likes: 0
cold start system 91 4.9 6cyl
What does Ford use for the cold start set up on a 1991 4.9 6cyl. Is it the by pass valve on the throttle body or something else. Any help is appreciated. Thanx, Fitty
Elder User
Joined: Jun 2006
Posts: 805
Likes: 3
Nevermind the EGR. Only time it's open is cruising speed, light - mid throttle, vehicle moving. It's closed during idle, hot or cold, and at WOT, hot or cold, and always CLOSED below operating temp around 160.
IAC is opened up more for higher idle speed, fuel enriched until some temperature (heavily debated), and timing advanced for quicker warmup above idle, and retarded some for smoother idle. All kinds of things going on behind the scenes on a cold engine.
IAC is opened up more for higher idle speed, fuel enriched until some temperature (heavily debated), and timing advanced for quicker warmup above idle, and retarded some for smoother idle. All kinds of things going on behind the scenes on a cold engine.
Thread
Thread Starter
Forum
Replies
Last Post
f-1fitty
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
3
Dec 13, 2004 01:34 AM
