Join Date: Jul 2007
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1996 Engine Shake when not FULLY warmed up
I have '96 F350 5-speed that will shake quite a bit in the higher rpms (>1500) when its not fully warmed up. I can have the block heater on at night, let her idle for 10+ minutes and it will still shake badly. It depends on how I use the clutch as well. If I lead with the engine rpms a bit it seems to help. At idle it sounds fine, a bit of a "psst" every 10th-20th revolution or so
I have an AutoEnginuity scanner and it passes both buzz test and cylinder contribution tests, but the cylinder contribution test will only perform when engine oil temps are > 170 degrees, and by that time the engine is running perfectly.
I have two ideas, please help me confirm or rule out either:
1. 2 piece flywheel going bad. Expensive repair and does it make sense that it goes away when the engine is warmed up?
2. Injector sticking/misfiring until its nice and warm, maybe an old o-ring that expands a bit when warm and creates a good seal? I'm not sure how to figure out which injector it is, I'm guessing infared or some other heat sensor on the exhaust manifold to see if any cylinder is colder than the others.
I live about 2 blocks from a ford dealer, but i'm reluctant to take it there, this truck was bought on a budget and while I want to make it run for a long time, i would like to do as much of it myself as possible.
Thanks for reading, I really appreciate this whole community.
'96 7.3 Crew Cab F350