bad milage
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bad milage
i asked this question in another section but haven't got any answers. i have a '97 F-350 regular cab long box. its got 460 with 104800 miles and dosen't use a bit of oil, but it is dumpung too much fuel into the engine and blowing black smoke with i know it is just raw fuel coming out. i replaced the map sensor, O2 sensor, the coolant temp sensor and the EGR control modual but not the EGR valve. i don't know if it is a leaky injector or what it is. the motor is stock other that KnN cold air intake, and headers back to glasspacks without cats and duel 45 degree 4 inch tips. why is it doing this. PLEASE help.
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What's the base timing set at? Fuel Pressure, how much? How's driveability. Is the black smoke at startup or all the time. Walk the cap, do you have a dead hole. If you had a bad injector spitting fuel u would have a dead hole. I'm thinking u have a fuel pressure or timing problem.
Jason
Jason
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From: iowa
I will bet money on fuel preasure, you need to check it but I would almost gaurentee you the fuel preasure regulator is bad. just had a 92 with exactly the same symptoms replaced the regulator and all was good that is right after changine the oil too because as much as they can dump you could have contaminated the oil in the process.
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i am not 100% sure about the timing or fuel pressure but the truck drives like a million bucks on the highway. it never misses,chuges, or anything. when i start it in the morning, it runs awsome, but when it starts to get warm, then it starts to smoke. but i will check the pressure and the timing and go from there.
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From: iowa
on the hiway your running more fuel through the injectors and the fuel preasure is higher anyway, heck it probably runs better under hard throttle if the preasure regulator is stuck on full preasure, it's just at idle and light throttle that the high preasure will cause you most of your problems, once again your symptoms sound like high fuel preasure.
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From: iowa
Another one that had skipped my mind, check the line going to the map sensor (witout going and looking I don't remember where exactly they are right now) make sure it's still attached and not cracked or broken and has vacumn at idle also.
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Sep 9, 2008 08:47 AM