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+--- Thread: Violent vibration at idle (/showthread.php?tid=4943)
Violent vibration at idle - fehron - 09-25-2013
My 82 NA 240 has developed an awful vibration at idle, it goes away with some throttle. As a bandaid, I just adjusted the idle up, but the idle has to be high enough that it takes quite a bit of effort on the brake pedal to keep from rolling away at a red light. All the engine and tranny mounts seem to be good and tight. There is no noise from the transmission so I don't think it's the torque converter. I assume that I have a missing cylinder, but I don't know if it would be a valve adjustment or an injector issue. What would be a decent price for a valve adjustment? Any other suggestions?
RE: Violent vibration at idle - larsalan - 09-25-2013
To isolate the problem at idle go through the injector lines 1 by 1 and crack them open with a wrench, 13mm I think. Just listen and watch the fuel seep out and see if that gives you any clues.
For the valve adjustment you can probably do it in under 2hr your first go and once you've done it a few times you can be through in 45min. Surely there are guides on that here somewhere.
Also, recommend nice clean fuel filters, clean fuel, and there's a screen in the tank that can get clogged a bit.
No other problems/symptoms? Or any video?
RE: Violent vibration at idle - sassparilla_kid - 09-25-2013
Injector lines are 17mm at the injectors
RE: Violent vibration at idle - larsalan - 09-25-2013
yea haha
RE: Violent vibration at idle - fehron - 09-25-2013
All new filters except for the strainer in the tank, but I did try reversing the return and pick up line with no change. The only other problem is where it has always started and idled just fine, hot or cold, it has died a few times right after starting. It always starts right up and continues to run after that. I will try to shoot a video and post it, it will be Friday before I get the chance.
RE: Violent vibration at idle - Mark_M - 09-26-2013
Is it only at idle that you are getting the vibration?
RE: Violent vibration at idle - 1911diesel - 09-26-2013
humm if cracking the injectors makes a difference, like it idles worse when you crack them, you might search for air in the lines. i had a fuel line leaking from tank to hard lines that ran under the car, and the copper crush washers on the fuel filter banjo lines were leaking, and the o rings on top of the fuel filter... also the now pink SD we own needed engine mounts... that was really violent before i changed them. need less to say, there are many reasons for bad idle... good luck hunting them down. like was said before i would start by checking injectors, then i would look for leaking fuel lines, then valve adjustment, you should be able to visually check the engine mounts and if they look ruff change them.
RE: Violent vibration at idle - Simpler=Better - 09-26-2013
Violent idle I would check :
Injectors popping properly (the line-by line check)
valve adjustment
proper glowplug operation
chain stretch
pump timing
RE: Violent vibration at idle - 1911diesel - 09-26-2013
see^^^ a few more things it could be...lol
RE: Violent vibration at idle - Eric78 - 09-30-2013
I've started having the same problem with my so-far stock 190d 2.5, It doesn't happen on start up but if I've been driving at speed for a little while & then pull up at lights the whole car rocks, & when accerating away it pulses until just over 40km/h.
RE: Violent vibration at idle - fehron - 10-03-2013
It turned out to be the motor mounts. I couldn't tell there was much movement at the mount, but the shop who fixed it for me showed me the old ones. They were trashed, and with the new ones in, it's smooth as a 240 can be. I'm gonna have the valves adjusted too, but for now the problem is remedied.
RE: Violent vibration at idle - 1911diesel - 10-04-2013
glad it was an easy fix. didnt cost you an arm and a leg did it?
RE: Violent vibration at idle - willbhere4u - 10-04-2013
Motor mounts make a huge difference in vibration Evan if there not broken they can get stiff over time
RE: Violent vibration at idle - fehron - 10-04-2013
Between parts labor and extra time to extract a broken bolt, it ended up costing $315... More than I'd hoped, but it's fixed and it would have taken me all weekend with the broken bolts and stuff.