my 5.9 shakes your teeth out

[dieselhotrodder]

i have a 92 w-250, this thing rattles your teeth out sitting in it idling. then its fine when your get the r's up... what the heck!?? anyone know.?? o have 2 other cummins and nothing like htis

[2stroke]

i will bet that your idle is set too low. try turning it up, see what happens.

[dieselhotrodder]

idles at 800-1000. it has a factory tach in it.. cant undersatand it

[Begle1]

Pump stock?

What RPM does it smooth out? Or does it only smooth out when there's a load on it?

[Richie O]

At 800 it should be smooth as glass. I had one truck that was real low and it would turn the screws out of the trim at a stoplight.

[dieselhotrodder]

ya, rpms seem stock.. this truck is 1 owner never touched. even the original paperwork is in the glove box. i jsut checked the idle. it idles at 700-750 almost 800. if you bump the gass it smoothes out.. odd. my other trucks idle lower.

[Begle1]

Hmm...

The timing may be advanced due to low pop pressures? Take the injectors out and have them clean/ pop tested/ reshimmed?

Usually an injection pump or injector problem that results in a rough idle will cause an RPM drop; fixing the problem will give some RPM back.

How much RPM do you have to give it before it smooths out?


How fresh is your fuel?

[cummins king]

Bad/ dirty Injectors, or lack of fuel because of lift pump or filter.

[cougar]

My 91 started doing that after I replaced the transmission mounts. At idle it rains screws in the cab.

[oilcan64]

mine almost does the same, it shakes some horrible when i shut it off

motor mounts?

[cougar]

My 91 also has and always did have a good shake on shut down. My 92 has a good belt squawk on shut down.