Engine sputters on deceleration - Ford Powerstroke Diesel Forum
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Old 06-07-2009, 08:03 PM
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Engine sputters on deceleration

I have a 99 Superduty with the 7.3 and 120,000 miles. Good power, uses no oil, starts well, recent oil change, fuel filter and air filter. I use Stanadyne Performance formula in the fuel. The engine idles normal when cold, but rough when hot. I sense that the hot idle rpm should be higher too - it's around 600 rpm. The engine goes almost silent when decelerating from highway speed, then goes to a sputtering idle as the vehicle slows, and then to a smoother idle just as the vehicle slows to stop. ICP sensor and regulator are OK. When the ICP sensor is unplugged the idle smooths out and the deceleration sputter goes away, but then the engine codes. HPOP oil pressure rests at 430 psi during idle. HPOP holds under load. Injectors all buzz test OK. Do I have a PCM issue perhaps? Could the injectors be worn? Any ideas?

Last edited by nexttimeforsure; 06-08-2009 at 12:24 PM. Reason: corrected info
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Old 07-03-2009, 06:38 AM
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Update - took the truck to the Ford garage where they found a Diablosport performance chip in the PCM. The chip was causing a communication failure betwenn the PCM and ICM. Removed the chip and reset to factory settings. The truck runs great now.
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