volvo vibrations

hi,i drive 06 volvo isx 06 ,have exact same problem,vibration as you describe, can't find this ##............ problem.........and makes me hate my truck .......help. one thing i found is i switched the hole on beam under air bags..........was on very botttom ,now is 2nd from bottom -still vibrate but not as hard as before.....since last year i replaced 4 air ride hight valves!!!!!!!!!!!!!!!!!!!!!!!!!!! HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP !!!!!!!!!!!!!!!!!!! PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

ok, with last oil change i found that all front air lines been fixed many times so i asked mechanic if he can take all of them becouse of some leak(front air bags lines plus one is coming to turbo box on the engine) he put new lines and conectors, after this leak is gone but i see on preassure gauge betwen 105-124 psi???? before i had around 83-96psi on bobtali and around 7psi on rear end before 12-15psi,,,,,now i see much imrovment in driving,,,, vibrations on heavy load is almost like nothing but i feel them more on light load or empty trailer??????? truck seems to be little soft on the back and harder on front????? anybody have an idea????? is there something /valve which regulate preasure coming to front and rear air bags( leveling preasure thing) ,,,,,,,interesting is that mechanic showed me something strange he never met,,,,,from the cab side inside the frame there are tho air tubes ( yellow and black ) and one has preassure other not,,,,he connected yellow to T conector and both ends to left and right air valves---seems good and correct,,,,,,and black conected to black tube from turbo box mounted on the engine,,,,,simple,,,,but after truck has been strated air bags got inflated with air but trubo wasnt working??????????? so he took another T conctors and short air tube and put one T conector right before T conector( which divedes air preassure to air bags) and other end conect with both black air tubes( t connector ---one black from turbo box and one black coming from under the cab) ,,,,,,,now air bags are working and turbo , but still is something not right .......like i said before front has high preassure and feels hard but rear air bags feels to soft and preassure went down ?????????? so we both thinking that must be some kind of valve/or somthing which regulate preassure to front and rear air bags and is broken,,,,,,,or these preassures what i wrote on the beginnig are correct ???? mechanic said he needs some air system scheme /diagram to make sure everything is connected in good direction ( bough my truck used and air lines seems to be fixed many times) ,air dryer is new, rear air ride valve new, cant hear and see with water+soap any other air leakes,,,,,,,thank you

 

no ideas???????????????????? maybe Pablo UA can help me/???? in addition i see freaquent air pressure loss from primary (front) tank ......today i drove 200 miles on heavy load 45000lbs and outside temp. was around 60s and couldnt feel anything!!!! no hood shaking, no mirrors rattels, no tire grinding, everything just perfect,

 

nobody has an idea????? cant belive it,,,,,,,i realy need to fix it ,,,,it worn my tires faster and afraid of any other damages......help

 

sorry for that,,,,,,im complaining about vibrations on whole truck, trying to update what mechanics says,,,,,,cuz going to different shops over and over and they keep me spending my money and truck still has vibrations,,,,,so i try simple,,,,no visual and hearing leaks but front tank freqently loosing preasure, all tires brand new,shocks,shaft bearing, all drive shafts new, front air ride valves ( 2 ) ,rear air ride valve, air dryer, front suspension springs,aligment 3 times, new clutch, new tie rods,checked whole truck for any mechanical issues -nothing found, rear end seems to be soft, heavy load very little or no vibrations, bobtail or light load vibrations on whole truck even on steering wheel no matter what speed or engine rpm.....

 

thank you, mechanic set front air ride with volvo special tool and is 7 1/4 inch from the bottom of the bracket of air ride valve (left side) to the bottom of air bag itself, then right side set to make whole truck to be level, rear end he set air valve rode in middle hole ( beam under air bags) and that give around 7,5 inch on bobtail ,he says this is correct but he said rear end has too low preasure and he doesnt have knowlege why??? but after checking air ride valve supply valve with gauge he found around 50 psi and suppoused to be 60-65 psi ( that makes me feel rear end is to soft)