97 12.7 idle issues
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by OhioHotshot, Dec 9, 2019.
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So what does half engine mode do?
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Its been a while but I think it only fires on 3 cylinders until the engine warms up. My old man had a DDEC 4 with that feature. It smoothed out considerably once it warmed up enough to start firing on all 6.
OhioHotshot Thanks this. -
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First if it was on half engine warm up, that wont log a coded.
Second them have poor ground studs from the factory at starter and battery box. I would expect them to have been changed by not. But its possible. They did not bolt it thru the frame. The just counter sunk the stud and tack welded it. Corrosion builds and loses ground. Normally the power steering hoses melt first being next path to ground. Dont re drill next to stud, because it's in the heat treated area. Go to the center of the frame rail and drill thru and bolt ground down to it.
And look up in wheel well for APADs. That was the year it was mounted up above RF inner wheel well.Rideandrepair Thanks this. -
Bk, pk, tk, mk, gk, hk...? -
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