BJ42LX ROUGH IDLE

  • Thread starter MarzBj42LX
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MarzBj42LX

MarzBj42LX

Joined
Apr 27, 2014
Messages
33
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 😁
 
F

Fedtime

Joined
May 7, 2013
Messages
68
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.
 
duncanrm

duncanrm

Joined
Mar 3, 2012
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1,070
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:
MarzBj42LX

MarzBj42LX

Joined
Apr 27, 2014
Messages
33
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?
 
duncanrm

duncanrm

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Mar 3, 2012
Messages
1,070
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


From the Factory Service Manual
 
MarzBj42LX

MarzBj42LX

Joined
Apr 27, 2014
Messages
33
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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