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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 04-07-2011, 11:16 PM
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big78f150 big78f150 is offline
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300 idles rough and dies if give gas

Ok I have an 88 bronco with a 300 5spd. I know its not a truck but not much help in the 300 section. When you take off and give it gas to take off it will die, but start up soon as you hit the key. If its idling and you give it more then a 1/4 pedal its like it cuts off and if you don't let up it will die, but you let off it runs. When idling it runs rough and has a slight miss. And it smells like its running really rich. Codes said map sensor, put a known good map sensor on it and a fuel filter, new plugs still does it. Will the egr being unhooked have anything to do wioth it? Please help
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Old 04-08-2011, 01:29 AM
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whats the fuel pressure ? how the timing , did it jump timing ? egr wont cause those problems !
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Old 04-08-2011, 01:43 AM
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Haven't had a chance to check fuel pressure yet. Left out that black smoke is coming out of the pipe too, so I know its running rich. Was going to check the timing today but loosened the nut up and distributor won't , trying to get it running right before I buy it
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Old 04-08-2011, 01:54 AM
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if you get it running then wont the price go up ? check fuel pressure and compression and if the compression is good then thats a good sign , if fuel pressure is bad that will mean a pump but dont put one in if the truck is not yours yet !
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Old 04-08-2011, 01:58 AM
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No its my friend lol. He's giving me the bronco and some boot for my truck
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Old 04-08-2011, 02:00 AM
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hope he's not laughing at you , lots of friendships have ended when one got screwed in a deal !
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Old 04-08-2011, 02:13 AM
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He just got the bronco, he ain't even drove it himself. I have a complete 87 f150 4x4 that's a 300 4spd I can use for parts with a complete motor etc. I paid 800 for my truck and he wants to give me the bronco and 700 cash. His offer not mine lol
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Old 04-08-2011, 09:40 AM
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Before spending a dime take a look at the Fuel Pressure Regulator. Pull off the vacuum hose then inspect it for signs of fuel by smell and sight. If there is any indication of fuel that means the diaphragm is bad which allows fuel to be sucked into the intake. I would suggest to also do the same test while the engine is running. Very common problem on these trucks.

If the FPR passes this test, then it is time to invest in a gauge to check the fuel pressure.
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Old 04-08-2011, 10:47 AM
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Already checked that so guess ikts time to get a gauge
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Old 04-08-2011, 12:08 PM
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it happened to me its the rotor button under the distributor

it happened to me its the rotor button under the distributor
do a cap and rotor change and change your ignition modual
when i did mine the rotor button was melted and it was throwing spark everywhere is why when it has a load onto it it dies cheers good luck

Quote:
Originally Posted by big78f150 View Post
Ok I have an 88 bronco with a 300 5spd. I know its not a truck but not much help in the 300 section. When you take off and give it gas to take off it will die, but start up soon as you hit the key. If its idling and you give it more then a 1/4 pedal its like it cuts off and if you don't let up it will die, but you let off it runs. When idling it runs rough and has a slight miss. And it smells like its running really rich. Codes said map sensor, put a known good map sensor on it and a fuel filter, new plugs still does it. Will the egr being unhooked have anything to do wioth it? Please help
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Old 04-08-2011, 12:08 PM
 
 
 
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