Idle Help Needed
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Joined: May 2002
Posts: 3
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From: spokane usa
Idle Help Needed
My 89 Bronco has a 302EFI in it. I have had this truck sinnce brand new. Just recently it will not stay running when you start it unless you keep your foot in the gas. It just starts, revs up and dies. But as soon as you put it in gear it will idle by itself. I pulled the air bypass valve out and cleaned it and it ran a little better that day, but back to bad the next day. When I'm just putting around and ease into the gas it hesitates, but on the highway it runs great, all the power is there. Here is a nother thing while it was running I pulled the connector off the air bypass valve and the idle droped real low, but ran smooth as silk. You hook it back up and idle speeds up and sounds rough as a cob. One of my buddies said to check the voltage on the throttle position sensor with just the key on at the green and black wire, and I should have .99 to 1 volt no less or no more. I have .90 volts does that mean its bad?
Laughing Gas
Joined: Apr 2001
Posts: 1,024
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From: Elon, NC
Idle Help Needed
No, it doesn't necessarily mean it's bad. My 85 doesn't have fuel injection so I will let the other guys chime in here. What info I know about a throttle position sensor (tps) comes from my Corvette. On them the tps is adjustable and has a desired setting of .54 volts. Even if yours is bad they aren't terribly expensive. Still I wouldn't buy one till you got better info than what I am able to give you. On the idle, does anyone know if Ford uses an idle air control motor? Again I'm basing this on my vette, but a bad iac or one that is set wrong will cause poor idle.
Just my $.02 worth.
Ron
Just my $.02 worth.
Ron
Tuned
Joined: Nov 2000
Posts: 426
Likes: 1
From: houston, texas (now Berli
Idle Help Needed
[updated:LAST EDITED ON 22-May-02 AT 12:52 PM (EST)]Where exactly is your idle at (with and without IAC connected)? Unplugging the IAC should stall and stop your engine, so there's some air coming in from somewhere, where it shouldn't. Check all your vacuum hoses for cracks (they get really brittle with age), that might be a problem. If the TPS reads .9V that shouldn't be too bad. You can adjust it by loosening the screws and turn it on the TB until you get higher voltage (not over 1V, though!).
If it idles in gear (automatic, I suppose?), I'd check some connections between the tranny and the engine/computer. I have a manual, so I don't know anything about automatics, sorry.
If it idles in gear (automatic, I suppose?), I'd check some connections between the tranny and the engine/computer. I have a manual, so I don't know anything about automatics, sorry.
