300 inline six carbed emissions motor picture
Senior User
Joined: Sep 2013
Posts: 373
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From: Marlborough, CT
Have found two different configurations using the smog/air pump on pre EFI.
1. Manifold rail with air injector fittings , 1/2" x 20 tapped holes in head
discharge of smog pump is connected to manifold through a check
valve. Hole in EGR adapter plate used for configuration #2 is plugged.
2. All six air injection holes in head are plugged with allen head screws.
discharge from smog pump is connected to side of EGR adpater plate
through a check valve.
Both configuration incorporate the curved heat tube from the exhuast manifold to ERG adapter plate
1. Manifold rail with air injector fittings , 1/2" x 20 tapped holes in head
discharge of smog pump is connected to manifold through a check
valve. Hole in EGR adapter plate used for configuration #2 is plugged.
2. All six air injection holes in head are plugged with allen head screws.
discharge from smog pump is connected to side of EGR adpater plate
through a check valve.
Both configuration incorporate the curved heat tube from the exhuast manifold to ERG adapter plate
Senior User
Joined: Dec 2013
Posts: 348
Likes: 4
From: Bakersfield,CA
The F150 that has the #2 smog pump configuration is a later year build date , pre EFI with carburetor, with the exhaust missing from the stock cast exhaust manifold to the front of a round muffler.
Junior User
Joined: Jun 2014
Posts: 56
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Hi all –new here – just “picked-up” a ’74 F100 with a 240 I6. It runs but not great – seems tohave either ignition and/or carb issues.
The 1-bbl carb looks like (very similar) to the onepictured. My question is – what is the small solenoid? on the back, passenger side of the carb. It has a rubber boot, and a wire. The (black) wire on mine is just cut. There is a rod going through it,and is seems it should contact a rod/lever back on the carb. Thanks for any input!
Last edited by MarkinTexas; Jun 2, 2014 at 11:13 AM. Reason: spacing
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Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
Hi all –new here – just “picked-up” a ’74 F100 with a 240 I6. It runs but not great – seems tohave either ignition and/or carb issues.
The 1-bbl carb looks like (very similar) to the onepictured. My question is – what is the small solenoid? on the back, passenger side of the carb. It has a rubber boot, and a wire. The (black) wire on mine is just cut. There is a rod going through it,and is seems it should contact a rod/lever back on the carb. Thanks for any input!
The 1-bbl carb looks like (very similar) to the onepictured. My question is – what is the small solenoid? on the back, passenger side of the carb. It has a rubber boot, and a wire. The (black) wire on mine is just cut. There is a rod going through it,and is seems it should contact a rod/lever back on the carb. Thanks for any input!
Senior User
Joined: Sep 2013
Posts: 373
Likes: 0
From: Marlborough, CT
The solenoid is used on the trucks even without ac. Set the idle speed with the solenoid energized, when you shut off the engine the solenoid de-energizes letting the throttle close completely preventing "run-on". ~Bill
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