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vaccum cleaner and ticking noise


lowsixfo64

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Six Fo, Six Fo, see if you can get a digital recorder and make a high quality MP3 of the noise, your description is not adequate. How loud is the vacuum noise? Where does it come from? The fuel pump can make a noise sometimes in the rear, it could be a bad accessory bearing, it could be many things.

Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life.

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This is hard to diagnose here. Is it possible that the noise you are hearing is that the idle is high on start up? Is there a tach on your car? IF there is see how high your idle goes after start up

Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life.

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Have you gotten your head in there go look at it? It could be a bad cooling fan motor, etc

It could also be a bad blower motor

As I mentioned its hard to diagnose here

Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life.

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lowsixfo64,

Based on your description, I suspect that the "vacuum cleaner" noise that you hear is the Air Injection Reactor (AIR) pump, which is an electric version of the old "smog pump" emissions control device that started appearing in vehicles back in the late '60s, although those were generally mechnical pumps driven by a belt off of the engine's crankshaft pulley. The AIR pump is literally an air pump -- it draws in clean air and pumps it into the exhaust system upstream of the catalytic converter during "cold" engine starts. The fresh air reacts with the hot, hydrocarbon-rich exhaust gases from the "cold" engine and acts to warm up the catalyst quickly so that it can perform its function and "clean" the exhaust gases. Basically, the AIR pump is a tool to reduce exhaust emissions on engine starts, which is why it only operates for a short period of time.

(BTW, to my knowledge, the acronym 'AIR' and its definition are unique to GM. The common auto industry term for this type of system is "secondary air injection.")

If your vehicle is new to you, then maybe you are just noticing the AIR pump noise for the first time, and then there is probably no reason to be concerned about it. However, if the noise has suddenly changed and become more noticeable, or if it is exceptionally loud, then perhaps there is some problem with the pump and/or its intake/outlet ducting. On '00+ Devilles (and '98+ Sevilles), the pump is mounted near the lower left front corner of the engine compartment, with the intake snorkel below and slightly behind the left front head lamp unit, near the engine's air intake snorkel. The pump's intake duct has a dedicated water/dirt separation filter atached to it. The outlet ducting routes to both the front and rear exhaust manifolds, through large vacuum-actuated switching valves; one of these valves is mounted near the upper left front corner of the engine compartment, outboard of the water pump drive belt assembly and inboard of the engine's air filter housing; the second switching valve is mounted at the very rear of the engine compartment behind the center part of the rear valve/camshaft cover. The switching valves are painted black, and each has a vacuum hose attached to it.

If the pump's noise has suddently changed, then perhaps there is debris on/in the intake duct, or perhaps one of the switching valves is not operating properly. In any case, inspecting the pump and its intake ducting will require some disassembly of the left front headlamp and the left front wheel well panels (with the tire/wheel removed). You may need to seek professional help to diagnose any problem.

I am unsure of the source of the "chain ticking" noise that you described, but I do not believe that it is related to the AIR pump described above.

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