HI, i have a 1989 f150 4x4 with starting problems. I have spark, i have fuel, it wont start by its self until i squirt fuel in the intake and then it fires up okay. at idle it puffs black fuel smoke and also at revs, i would like to know where the enertia switch is located and i have noticed that the fuel pump is running all the time when you turn the key on . can someone help me with this. regards Blinky Bill.
I don't believe the inertia switch is your problem, when this switch is triggered it totally disables the fuel pump, so you wouldn't be able to start it at all. Your engine could have a number of problems but from your brief description (no warning lights on?) I'd be looking at injectors, fuel pressure regulator or low compression.
Hi, Backlash thanks for your reply, i started it today using fuel squirted into the intake and it is puffing fuel smoke (black) while idleing and when you rev it , it gets worse but it revs. I checked all the sensers and air by pass . they seem to be working alright. the motor is freshly rebiult. we are in the process of painting it. last week it was running perfect and my sun put it in the garage and the next morning it wouldnt fire up by itself. is there anyway of testing the injectors with out removing them. Regards bill
You never mentioned this was a rebuilt before...What kind of engine are we talking about now? the original engine? 4.6L, 5.0L, etc?
Fonz is right, re-check the timing and while you are painting the engine do a compression test, sometimes rings break when they're fitted. Test for spark at each individual cylinder, if ok disconnect the injectors one at the time and see which cylinders make a difference. Sensor-wise, as far as I know, only the MAP sensor and camshaft pos. sensor will give you those symptoms you describe of blowing smoke all the time. cheers
Hi, thanks guys for the info, I will try it today. the motor is a stock 5.0lt. sorry for not describing it properly,.We are painting the whole car. My sons a spraypainter he wants to do some speacial efects on it. we will have to wait and see what he does. Anyway i will try the info today and let you know the results tonight. thanks again much appreciated, Regards Bill
Hi, Backlash i started it on a squirt of fuel in intake and checked the fuel pressure in theinjector rail and it was a steady 35 psi so i am asuming it must be the injectors. i tried to order some today but the injector supplyer siad he did not have a listing for 5.0lt only for 4.9lt are they the same motor or am i getting the run around it seems strange. Regards Bill
Why don't you try testing the injectors before replacing them ? Anyone that has a modern injector cleaning machine will have the equipment to do a flood/leak/spray pattern tests. That way you'll be 100% sure it's the injectors and won't be throwing money down the drain.
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