Rough Idle
Hotshot
Joined: Dec 2012
Posts: 11,278
Likes: 1,658
From: Las Cruces New Mexico
So shimming an injector to gain armature to body top clearance is too band aid an injector when it starts rough cold and runs fine once warmed up. This is due to the cold oil causes the armature plate to stick (stiction) to the body top. Unfortunately shimming an inector will not fix a worn upper poppet valve seat. The cheapest way to fix this issue is to use good core injectors and pull apart the top of the injector and swap poppet valve and upper top and or seat parts. There are also shims for the upper seat. This can be carefully accomplished without removing the injector. You would pull the solenoid off then the armature plate then the 4 body top screws and the poppet valve and spring will be accessible. The only other way I see to limp this issue by is to pull the thermostat and run without one. The downside is the engine will take much longer to warm up (no cab heat) and run substantial cooler. This will keep oil temps cooler and hopefully allow it to hot restart. I have ran 7.3s with stuck open thermostats before.
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lifted_01_SD
1999 - 2003 7.3L Power Stroke Diesel
12
Apr 25, 2006 02:42 PM
