I think I cross two of my vacuum lines - Cougar Mercury Cars & Trucks

Look on the radiator cross member and there should be a diagram for the vacuum lines. Hope this helps.

http://www.carforum.net/transmissions-drivetrain/15664-isuzu-rodeo-4wd-wont-engage-clicking-noise.html
see post 9

post 3 and still the part you state is named wrong.
my best guess, is the
front alxe lock, up, device. with 2 lines
is that it.
?????
there are only 2 ways, 2 lines
is it so hard to try both ways, on 2 solenoids?

The vacuum line diagram is on the cross member in front of the radiator. If yours is gone then google the year and make and it will show you the routing.

That is the main source of vacuum...all other vacuum lines start near there...the main vacuum line will go to the brake booster, smaller lines will go to EGR, and all other points of the vacuum system. There is usually a small diagram on the cross beam attaching the radiator to the frame.

Sounds like the egr solenoid stuck..Not the valve..When you are sitting at idle,,you should be able to take off the vacum line and there should be no vacuum..,If there is back track that line and see if it goes to a solenoid..I bet the vacuum lines are crossed..One should have vacuum,,the other should go to the egr valve..If they are crossed on the egr solenoid,,then you end up with constant vacuum going to your egr valve..Until you figure it out leave the line off the egr valve and block the line..If you are constantly haveing the valve held open,,you killing sparkplugs and the catylitic converter

you should have a 722.2 or 722.3 transmission . Theese are 4 speed but not overdrive. The vacuum line going to modulator should be manifold vacuum , mean it is supplied directly off the intake manifold and should be 16 to 18 hg at idle and nearly zero at wide open throttle. benz loves to use nylon lines to source vacuum for different things and they get hard with heat and age and break. Nobody could remove an engine on a 20 year old benz and not break one somewhere.

you crossed the egr valve hose most likely. there is a diagram on the underside of hood

should be a scematic under the hood. either on the inside of the hood or the radiator cross member

HI...
Yes the more probable is a fual line crossed.
you need to identify the pressure line. vacuum line and the return line.
The pressure go to the fuel filter.
The return go to the fuel tank. by the pump housing.
An the vacuum to the canister.

OK... I hope this help on your problem.
Thank you for use fixya.