Ford "cold shoulder"
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Ford "cold shoulder"
I have a 1987 Lincoln Town Car that lately has been stalling when cold. After warm-up, it’s okay. Since I don’t see a carburetor or choke to tweak, I’m wondering how this engine “chokes itself” until warm-up occurs (it is a 5.0 L, SEFI system with 165K miles). Although I have the Ford shop manual, it’s not clear enough to allow an understanding of the cold engine warm-up process. Anyone know which part(s) I should replace/tweak/adjust (TPS vs EGR vs Air Bypass Valve)?
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Here's a good website that might help explain EFI a little better: http://fordfuelinjection.com
The computer takes the input from the coolant temp sensor and air temp sensor and richens up the mixture until it senses that the engine is warm. That's the short version, the actual fuel strategy is a little longer, but that's basically what happens.
The computer takes the input from the coolant temp sensor and air temp sensor and richens up the mixture until it senses that the engine is warm. That's the short version, the actual fuel strategy is a little longer, but that's basically what happens.
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
Idle air controller, also reffered to as the idle air solenoid, or the air bypass valve, and it is located on the throttle body. Fairly accessable, there are only two bolts that hold it on, and one connector.
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Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
Yep, it is on the rear of the throttlebody on your car. It is held on by two 8mm socket headed bolts. It has a round cylinder on it with a 2 wire plug. It takes about 5 min to change if you don't drop either bolt down behind the engine 
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