Join Date: Jul 2011
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Hello all. I was asked to take a look at a 7.3 today that would lose power, go to idle, stall, restart, smoke black, blue and white. No power after restart.Vehicle owner had already replaced valve cover gaskets , injectors ,CPS , new fuel filter, rebuilt fuel pressure regulator. He had also had the truck plugged in at the dealer and had no trouble codes. Left the truck at the dealer because it seemed to happen more first thing in the morning.
The problem was that his engine oil level was low. Good engine oil will creep up the dipstick and give you a false reading first thing in the morning. Always pull stick and wipe clean before checking.
The oil level was low enough to allow foaming or sucking of air into the oil supply, thus wreaking havoc because the injectors cannot function properly if the engine oil has foamed or is mixed with air.
I should point out that the oil pressure gauge read on the high side of normal the entire time he has been having this trouble.
First test was to hold rpm's at 2500. After 5 seconds or so rpm starts to drop, engine started to miss and blow smoke, surging at idle, then stalled. Pulled dipstick and saw air bubbles in oil on stick. Waited 20 minutes, checked oil properly, added oil to full mark. Problem solved, runs great uphill or down, hot or cold, loaded or empty.
In closing, never trust the first pull of the dipstick, always wipe clean, then check for an accurate read.