Hello Guys! Just giving my 5C I struggle fuguring what was wrong with my truck it vibrated on D only! I checke with my OBDII for any signs of vaccum leaks, Fuel shortage or leakage but everything looked fine! Vibration was even all a cross meaning that it didnt feel like an specific cylinder was doing it (heads were new it overheated on me over fan clutch) anyways air intake Tem looked fine, MAP sensor fine as well and no Engine light, O2 responded fine as well so I knew all elements that control air/fuel mixure were fine so it pointed to something else, may be tranny mount or motor mount so I got under neath and checked tranny first I used my floor jack pipe to push up the tranny but nothing change, I noticed it had a bracket that hold the exhaust and it attaches to the tranny mount as well so I got the pipe under that bracket and pushed it up and to my surprise vibration went a way so I did it a few times to make sure that was working and it did, by pushing that bracket up I was pushing the Engine as well so it was clear what the problem was! Motor Mounts! I Order new from Dealer Gmpartsdirect $159 pair I didn't know if originals are AcDelco or Delphi so I didn't want to take the chance! Anyways I replaced them in about an hour and truck doesnt vibrate anymore! I can't even tell that is On! I bit of the work I did to replace them, no need to take any A arm apart or nothing! By each Tire there are 3 Big bolts that hold the Mount Bracket remove them from both sides, I used a 2X4 pc of wood underneath the oil pan/ put it on the side where the pan is harder, lift it so its easier to remove side bolts, after all 6 bolts are removed you need to lift the engine until you can lift the bracket ( it has a lip thst holds it in place) tgen just keep lifting until it pops out, replace with new mounts and put it back the reverse way, when you replace the first one dont tighten the top bolt you need to lift it for the other mount, install the other mount and your done! Make sure you don't forget the hear shield on the passanger side as I did or you will have to remove it again!? Good luck Guys
If your vibration is Even meaning you dont feel and missfire then go this route above!
If you want to test the head/ gasket there is different ways
1- leak down Test
2- smoke through Radiator, if water gets through smoke will even easier! Radiador empty use a radiator tester cap which has plug, hose to add presure and pump smoke, Ebay or many other sites sell it!
3- check for spark plugs redish color/water
4- check oil cap for any white film
And oil dipstick it self.
Easiest way to know if it is your mounts lift muffler with a bar close to engine, if it gors a way forget all other things you know the reason!
Tuesday, May 30th, 2017 AT 1:17 PM