AMC Eagle Den Forum

The Mighty 258 => Emissions/Vacuum Systems => Topic started by: Sandeagle on September 13, 2015, 09:02:15 AM

Title: Dashboard vac.lines
Post by: Sandeagle on September 13, 2015, 09:02:15 AM

Before I start digging  what vac lines are behind the dash. I hear a leak at idle,during acceleration it cuts down but at cruising  speed it comes back. I have cruise control  but haven't tried yet.  Just got her yesterday.. Am not sure if 4wd is engaging  either.

Title: Re: Dashboard vac.lines
Post by: txjeeptx on September 13, 2015, 01:54:42 PM

There are vacuum lines going to and from the 4wd switch on the dash, and some of the heater/defroster controls use vacuum. Those are places to start looking for disconnected or rotten lines for a vacuum leak inside the car.

Title: Re: Dashboard vac.lines
Post by: Sandeagle on September 13, 2015, 03:23:48 PM

Anything for cruise control

Title: Re: Dashboard vac.lines
Post by: txjeeptx on September 13, 2015, 04:40:27 PM

The only vac line for the cruise stays in the engine compartment. Cruise control, whether factory or added on, only has wiring inside the cabin.

Title: Re: Dashboard vac.lines
Post by: AMC of Houston on September 13, 2015, 04:45:19 PM

Well, except for that silly cruise vacuum bleed-off switch on the brake pedal.  But it only has vac to it while the cruise is engaged.

Title: Re: Dashboard vac.lines
Post by: carnuck on September 14, 2015, 12:56:00 AM

Unless it's hooked up wrong. Bad brake booster will do that too.

Title: Re: Dashboard vac.lines
Post by: Sandeagle on September 19, 2015, 09:41:07 PM

Once I noticed when she was parked for 4hours the brake pedal was solid the first time I stepped on it and I haven't stepped on it at all when it was parked. She is running great since I found and pluged the leaks I could find. A manifold vac line was off. I could hear the leak inside the car from under the hood. That was the reason for the post,it sounded like it was behind the dash.