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2003 ford 6.8 liter cranks good starts right away then stumbles and even stalls.
So when i start this truck and its cold it starts right up then stumbles and stalls. The idle air control solenoid is working verified that, the the full pump is at 35 psi when key on ,drops off to low pressure when cranking, comes right bact to 35 to 40 when idling. Havnt figured out why it drops off at crank when cold warm starts are good no issue. Any thoughts?
Its a f350 . Havnt had a chance to get the truck back in for some snap shots. Have changed the injectors cause a few were leaking fuel so it would cause a rich condition when hot and a long crank on a hot start. Now its good for a hot start it just stumbles after starting when cold.
I have a similar issue with my car, I think its the ignition timing on mine, as it stays advanced instead of retarding it, but then after it warms up a bit it idles fine and at the base timing
Since it is happening only on cold starts load test battery as silly as it may sound. A parts store can load test it for you. Does the vehicle ever actually fully start when its cold?
I would check PCV and EGR however, that doesn't seem like the likely cause of your stalling problem since you're loosing fuel pressure. A drop in fuel pressure IS a problem.
When it is giving you problems, I would verify spark and injector pulse. Just to make sure the cold isn't causing a driver or an input problem.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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