What is this doodad?

[GHWillys]

Gren may have solved the case, but I still think It's the Fetzer valve. The one on mine keeps sticking.

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[Maximus Gladius]

Distributor cap.

 

[chorky]

i MAY have solves it.

hmm. seems a poor location for a vacuum pump - I wonder if water can back feed into it if submerged and not on pumping are out of the vacuum booster. Also kinda interesting how they don't use engine vacuum anymore?? Since when? I must be getting old......

 

[seven30]

hmm. seems a poor location for a vacuum pump - I wonder if water can back feed into it if submerged and not on pumping are out of the vacuum booster. Also kinda interesting how they don't use engine vacuum anymore?? Since when? I must be getting old......

It's got a tee and check valve to the intake like the old days. I think the pump is to ensure vacuum is maintained during the stop part of the start/stop although I try to remember to disable it.
I wonder what other doodads these have. There is an electic power steering pump somewhere.

 

[ShadowsPapa]

hmm. seems a poor location for a vacuum pump - I wonder if water can back feed into it if submerged and not on pumping are out of the vacuum booster. Also kinda interesting how they don't use engine vacuum anymore?? Since when? I must be getting old......

Vacuum pumps have been used for years....... you need brake boost in case of engine failure, in ESS events, or when the engine is under load and in low-lift valve mode. Engines aren't the vacuum pumps they used to be. Even guys who have rad cams in their cars (more rad than the one I run in my 73) use vacuum pumps for brakes or even to evacuate the crankcase since PCV systems don't work on such engines.

It's interesting that no one has really wondered how the power brakes work on these under so many conditions.

 

[chorky]

Vacuum pumps have been used for years....... you need brake boost in case of engine failure, in ESS events, or when the engine is under load and in low-lift valve mode. Engines aren't the vacuum pumps they used to be. Even guys who have rad cams in their cars (more rad than the one I run in my 73) use vacuum pumps for brakes or even to evacuate the crankcase since PCV systems don't work on such engines.

It's interesting that no one has really wondered how the power brakes work on these under so many conditions.

I wonder... But just haven't had time to dig into it with other priorities.

Ok so but when did vacuum pumps become mainstream via OEM for gasoline vehicles? Sure diesel has had them a long time and I can see how performance engines would. And I quit being a master tech for Ford in '05 which...man that was almost 20 years ago I guess. But back then everything was still vacuum from the engine. At least Ford Lincoln and Mercury were.

 

[booneja]

Flux capacitor

no that is the regulator for the flux capacitor, this is the flux capacitor....they can't seem to keep them in stock....

 

[toddarama]

Isn't that the blinker fluid reservoir? ... it's a little hard to get to, but it's critical to keep that topped off.

 

[Gvsukids]

Isn't that the blinker fluid reservoir?

Isn't that what tears are for?

 

[Wolf Island Diver]

I don’t know, but I took mine off and she runs goooood now, bro. ?

 

[seven30]

Vacuum pumps have been used for years....... you need brake boost in case of engine failure, in ESS events, or when the engine is under load and in low-lift valve mode. Engines aren't the vacuum pumps they used to be. Even guys who have rad cams in their cars (more rad than the one I run in my 73) use vacuum pumps for brakes or even to evacuate the crankcase since PCV systems don't work on such engines.

It's interesting that no one has really wondered how the power brakes work on these under so many conditions.

I was thinking it was electro-hydraulic until I noticed the vacuum diaphram. I had an 80s Alfa that was electro-hydraulic. No vacuum. I think some Buicks had the same setup.

 

[ecidiego]

A thing that stupidly interferes with the belt tensioner strong-arm hole so you have to remove it to mess with the belt to change the alternator.

 

[ShadowsPapa]

I was thinking it was electro-hydraulic until I noticed the vacuum diaphram. I had an 80s Alfa that was electro-hydraulic. No vacuum. I think some Buicks had the same setup.

Like Chevrolet used - the pump handled PS and PB hydraulicly.
"Hydro-boost", not vacuum.

 

[seven30]

Like Chevrolet used - the pump handled PS and PB hydraulicly.
"Hydro-boost", not vacuum.

Was that pump engine driving or electric? The 2003 Ram diesel has a pump driven PS/PB system.
No start/stop on that tank.

 

[RVcruzer]

As Shadows Papa described, it is the vacuum pump for the brake booster. Engines don't make as much vacuum as they used to - especially once carburetors with throttle bodies went away. Under certain conditions the vacuum isn't sufficient for a sustained brake pedal response so the electric vacuum pump keeps the vacuum strong in the brake booster..

I tow our Jeeps behind a diesel pusher motorhome and have an M&G pneumatic braking system that applies the Jeep's brakes proportionate to the coach's air brakes. I had to cut into the harness for that pump so that it would operate whenever the Jeep was plugged into the hot wire on the coach's trailer lights harness otherwise the pneumatic actuator wouldn't have the power to depress the Jeep's brake pedal without vacuum. That's common to most Mopar products. Ford and GM require an add-on vacuum pump for flat-towing behind a motorhome.

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