BJ42LX ROUGH IDLE

Joined
Apr 27, 2014
Messages
37
Hi All,
Just got myself a Bj42Lx (3b diesel)and very happy with it though...it shakes quite a bit on idle at a red light or when rpm is low. Feels like it’s running rough and should have a little more oomph. Basically when I’m at a stand still feels like I’m in a vibrating machine lol. Your assistance is appreciated. I’ll also post some pics 😁
 
Joined
May 7, 2013
Messages
73
Location
Halifax, Nova Scotia Canada
You will get better response in the diesel section, I suspect.

But for what it is worth: I have been driving the 3B diesel for many years in both the 60 and 42 series. A low idle will cause the engine to appear to run rough and will shake the whole vehicle. If it disappears when you increase the RPMs, I suspect your idle is just set too low. While you are at it, check the integrity of your engine mounts and trans mount.
 
Joined
Mar 3, 2012
Messages
1,131
Location
Adelaide, South Australia
A good 3B will idle quite smoothly.. no rocking back and forth, and definitely not shaking the vehicle.. some things to check:

  • Compression test
  • Valve clearances
  • Spill Timing
  • Injector Spray Patterns
  • Idle speed (as suggested by @Fedtime)
  • Engine Mounts (although with your description of the vehicle shaking its unlikely it'll be this)
 
Last edited:
Joined
Apr 27, 2014
Messages
37
Thanks guys for the response. Fedtime, yes it smooths out when the rpm increases. I will try to increase the idle...though what rpm should it read on idle?
 
Joined
Mar 3, 2012
Messages
1,131
Location
Adelaide, South Australia
Thanks guys for the response. Fedtime, yes it smooths out when the rpm increases. I will try to increase the idle...though what rpm should it read on idle?

650RPM

1637539760848.png


From the Factory Service Manual
 
Joined
Apr 27, 2014
Messages
37
Thanks..... I’ll have look at it and see how I go. I’ll also take it to my diesel mechanic and see what he thinks. Thanks again for the help.
 

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