engine bogs on hard accel
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engine bogs on hard accel
I have a '90 F-150 w/ I-300, dual tanks, a/t, fuel injection.
It should pull my boat with no problem, but it is sluggish and bogs down. The symptoms are a little worse on the front tank than on the rear. Other symptoms are that it takes several turns of the key to start it, idles rough when first started, stalls occasionally when first started. Also, if you floor it the engine sputters a bit, and it will actually accelerate faster if you let off the pedal a little. I suspect fuel pump, vac leak, or possibly fuel pressure regulator. Filter, plugs, wires, cap have been replaced.
Any ideas ??
It should pull my boat with no problem, but it is sluggish and bogs down. The symptoms are a little worse on the front tank than on the rear. Other symptoms are that it takes several turns of the key to start it, idles rough when first started, stalls occasionally when first started. Also, if you floor it the engine sputters a bit, and it will actually accelerate faster if you let off the pedal a little. I suspect fuel pump, vac leak, or possibly fuel pressure regulator. Filter, plugs, wires, cap have been replaced.
Any ideas ??
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Joined: Jan 2004
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From: Pittsburgh, PA
The differing in symptoms on the tanks makes me suspicious of the switching. I'd still check both pumps also as one can easily be weak. Hopefully, you don't have clogs in the tank(s) from sediment and/or rust. Sounds like you'll have to drop the tanks anyway so that's something I'd check for also. Ford truck tanks are known for rust. I found that out first hand with my son's old '86 Bronco and when I bought my '91. I had to replace the front tank, pump, and sending unit. They were shot due to rust.
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Joined: Sep 2003
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From: Houston TX
Sounds like a lack of fuel volume or pressure. Could be clogged lines, shot pumps, etc. See if you can rig up a fuel pressure gauge. You really need it to service EFI. Could be the regulator, but offhand I bet it's something else causing a lack of fuel volume.
You say the filter is new, so scratch that...
I doubt a vacuum leak is the problem. The only emissions part I can think of that *might* cause that is a shot O2 sensor. But I think you probably have a fuel delivery problem... MK
You say the filter is new, so scratch that...
I doubt a vacuum leak is the problem. The only emissions part I can think of that *might* cause that is a shot O2 sensor. But I think you probably have a fuel delivery problem... MK
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Joined: Jul 2003
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From: Pittsburgh
Something else to consider is that a stock 300 will accelerate no more quickly at full throttle than at half throttle. It just can't breathe enough. That's why a 300 accelerates better when you back off of the throttle. (it's normal)
Besides that part of your description i agree, i don't think you're getting the fuel that you should be.
Justin
Besides that part of your description i agree, i don't think you're getting the fuel that you should be.
Justin
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DavidMc70
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