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Temp sensor may have failed in a mode that tells computer that engine is hot -- and if it IS hot, then timing, fuel injector pulses, etc are set correctly. If the engine is cold, but sensor says its hot, the fuel mixture, and other computer- controlled adjustments may be off for a cold engine.
Can't see why pumping accelerator would do anything (this IS fuel injected right?). On carbureted cars pumping accelerator activiates the acceleration pump which squirts a little fuel into the throttle body; on fuel injected, it doesn't do anything (I don't think).
But it may offer a clue -- while pumping the accelerator does not do anything, most cars (maybe all) do have a flooded mode in the computer. If the key is on, and you press the accelerator to the floor, the computer goes into this flooded mode and adjusts the fuel air mixture to accomodate the flooded condition. If the car stars better when you do that, injectors may be leaking and flooding it. But I almost think this rich mixture would make it start better, Hmmm. But on startup, computer is calling for rich mixture, leaking injector(s) may make it TOO rich.
Spark plugs are also possibility. I once gapped my plugs too wide and had a heck of a time starting.
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Raul
91 Sentra E, 1.6, 3-sp A/T
96 Sentra GXE, 1.6, 4-sp A/T
81 F-100; 89 Jeep; 93 Grand Caravan
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