Rough Idle and Engine Vibration

[tgtaylor64]

My M1009 seems to idle rough and the engine vibrates. Smooth at highway speeds. Wondering if one of my injectors is bad. If I listen to each exhaust, one seems like it is rougher. Could this be a simple way of telling which side of the engine is giving me trouble? Eliminating four cylinders ups the probability of replacing the fewest injectors.

 

[timarr]

I have the same problem on my m1008. I thought it was injectors but it wasnt. I had pump rebuild with 10 % increase and truck runs like a watch, No mirror shaking or rattles.

 

[Recovry4x4]

Many vibration issues can be remedied by upping the idle just a bit. Try this, stopped with the truck in gear and brakes applied, use the peddle to bring up the RPMs just a tad to see if it goes away. If so they you would probably benefit from upping the idle.

 

[timarr]

I tried that but then idle was over 900 rpms , It did hide the shake but truck would pull away if you took foot off brake.

 

[Barrman]

Loosen injector lines one at a time while the engine is running. Fuel should shoot out and the idle should drop. Just like pulling spark plug wires on a gasser. If you get a drop with every injector like I did. Then I would suggest pulling the IP return line check valve and making sure it isn't clogged up. Even if it isn't clogged up, it could still be your IP. I replaced mine and it made a world of difference.

 

[scottladdy]

Just my $.02, but I would replace all the injectors as a set if I found one bad. If you are running the original IP and injectors, in my opinion it is just a matter of time before they go.

I replaced all of mine recently with reman'd pieces from Badger Diesel. Outstanding pieces. Truck runs like a watch. Prices are reasonable. He does charge a core up front. I received my core back lickity split. He also sells a return line that you cut to size and uses NO clamps. Push on easy to install. Check the what have you done recently for pics.