idle up and down
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Junior User
Joined: Jan 2005
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From: new britain, ct
idle up and down
I have a 93 aerostar with 136k mi 3.0 v6 at start-up it will idle up and down probably 15-30 times pe min, then after it warms up it runs fine. sometimes it will quit and start up again if the van is not 100% warm. any ideas?
Fleet Mechanic
Joined: Mar 2004
Posts: 1,529
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From: Kansas
Originally Posted by PrarieOyster
I have a 93 aerostar with 136k mi 3.0 v6 at start-up it will idle up and down probably 15-30 times pe min, then after it warms up it runs fine. sometimes it will quit and start up again if the van is not 100% warm. any ideas?
Posting Guru
Joined: Jul 2004
Posts: 2,416
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From: Mitchell, SD
I would also say it is the IAC valve is the most likely suspect. Also how old are your plugs and wires? And before replacing the MAF, I would try cleaning it with some electrical cleaner before replacing.
Junior User
Joined: Jul 2002
Posts: 79
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From: kitch
I recently eliminated this problem with my 93 3.0
The IAC (or Air Bypass Valve) Is ridiculously easy to remove, clean, and put back on. Two screws, thing comes off. I cleaned mine by blowing out the loose build up with the air gun, spraying the crap out of it with a silicone basaed lube and letting it soak for a while, then blowing it dry with the air gun again. Also, the little black cap on the side is not just a cap, it allows air in and has a built in filter. make sure you clean it out too.
After you replace the IAC, you should give a bit of a turn to the throttle cable adjusting screw It is right by the IAC under that black plastic cover. The cable from the gas pedal comes in and is attached to a springed lever. there is a screw that sets the stop position. You should give the screw a turn so that it slightly increases your throttle rest position.
These two things will make the problem go away. At some point you may still need to buy a new IAC.
The IAC (or Air Bypass Valve) Is ridiculously easy to remove, clean, and put back on. Two screws, thing comes off. I cleaned mine by blowing out the loose build up with the air gun, spraying the crap out of it with a silicone basaed lube and letting it soak for a while, then blowing it dry with the air gun again. Also, the little black cap on the side is not just a cap, it allows air in and has a built in filter. make sure you clean it out too.
After you replace the IAC, you should give a bit of a turn to the throttle cable adjusting screw It is right by the IAC under that black plastic cover. The cable from the gas pedal comes in and is attached to a springed lever. there is a screw that sets the stop position. You should give the screw a turn so that it slightly increases your throttle rest position.
These two things will make the problem go away. At some point you may still need to buy a new IAC.
