little motor cycling when ignition is on

[MSkyrman]

I am unsure what purpose this motor serves is in the attached photos. Just recently, it cycles on when the key is in the ignition, runs for 5 to 10 seconds, then shuts off, then does the same thing a minute or so later. AC and heat are off when this happens. I know its this motor because I can feel it whirr when I put my hand on it. It is a little motor on the passenger side of the engine compartment right in front of the ECM. Just trying to figure out what this motor does and what I might need to do to get it to stop doing this.

 

[Wayne M.]

I'm pretty sure that's the vacuum pump that operates the hvac doors and etc. diesels don't create vacuum in their intakes, so it must come from a pump. I've never heard of them acting up with warning.

 

[jhenderson]

Vacuum leaks can cause them to cycle. Also causes cruise control problems. Check your vacuum hoses for chaffing.

 

[cerberusiam]

Vacuum pump for the cruise control. Start tracing lines and connections, they rot out after a while. If they look good plug it off at the pump to see if it will hold with just the pump.

 

[MSkyrman]

Thanks everybody, I really appreciate your help. I will start looking at the vacuum lines and connections and go from there.

 

[MSkyrman]

It was a hole in a vacuum line. The hole was right in front of the fuel filter, who knows, may have knicked it or something when changing filters. Lines seems really brittle. Anyhow, until I can get into an auto parts store to get parts to splice in a new section of line, I put some liquid electrical tape on it as a stopgap measure and it stopped the vacuum pump from cycling.

 

[GCroyle]

Man, that really sucked.

You's better be grinning, its a nasty day outside, gotta have some fun somehow.

 

[mwilson]

Man, that really sucked.

You's better be grinning, its a nasty day outside, gotta have some fun somehow.

Same here, started raining this morning at only 17 degrees. Needless to say we are stuck here until it warms up later.

 

[GCroyle]

Mike,

68 Degrees right now, but still uber humid out, lots of precip yesterday.

Took Dodge in this AM to get NEW Michelins re-balanced, watched re-do original off by OUNCES!!!!!!!!!!! on several wheels. They should be embarrassed for that negligence. Grumble grumble.

 

[Prairie Dog]

Nice trouble-shooting MSskyrman!

Scott

 

[mwilson]

Nice trouble-shooting MSskyrman!

Scott

Yes, excellent job!!!

Mike.