I have a 88 f-250 4x4. It has a fuel injected 460. For some reason it keeps getting fuel in the oil. I have replaced the plugs, fuel pressure regulator, and temp sensor. I put Lucas in with the oil. And still getting fuel in the oil and smoking bad. Right after changing oil and plugs it stops smoking for a while. I have a 460 sitting in the yard and was thinking of switching to a carb. How can I tell if the intakes are the same. Any ideas?

 

Don't change over to a carb learn how to work on and fix FI instead, its the better choice.

And don't throw parts at it attempting to find the cause, that's never a good idea.

How about a fuel static pressure test, has one been done?

Perhaps the fuel injectors, one or more of them are leaking and time for replacement/rebuild either one?

 

Is you emissions equipment hooked up and WORKING? Check your PCV valve. If you have fuel in the oil your the only way it can get there is if you have a mechanical pump that some how broken the seal inside. Or you washing past your rings. If your washing past your rings your running PIG rich and you need to figure out why.

 

The intake won't work. The ports on the EFI heads are unique and won't line up with a carbed manifold. That probably won't fix your problem anyway. It sounds like you probably have collapsed rings and getting some blow by into the crankcase. That would explain why you're burning oil too; no oil control. Do a compression check.

If you have a good 460 then you can swap out the short block. Use your EFI top in (heads AND intake) and as long as it's stock with a comparable cam it should work fine. If you're dead set on a carb swap then just swap the whole thing in.

 

I have been replacing the parts that I have been told might be the problem from this website. But I am going to buy a pressure tester. The pump has been replaced.

 

The motor was rebuilt less than 30000 miles ago

 

The parts 460 has a bad block. I have it originally for my 77.

 

Or you washing past your rings. If your washing past your rings your running PIG rich and you need to figure out why.[/QUOTE]

What would cause that?

 

maybe fuel pressure regulator. I would get a fuel pressure tester and see what the pressure is compared to what it is supposed to be. on a hunch how did you break in the new motor, and has it been doing this the entire time since it has been rebuilt.

 

You could have a leaking injector. It is not difficult to tell, though it is not immediately obvious. When you start a fuel injected vehicle, the engine must turn several times before the fuel injectors are allowed to spray. You can almost count this delay, it's the same every time. On old carbed vehicles, there is almost always some fuel hanging around in the intake - especially if you've pushed the accelerator pedal. If that's the case, they'll start almost instantly when you turn the key. Blah blah - the point is, if your fuel injected truck ever begins starting instantly at the key turn, instead of taking a second or so of engine turning, you have fuel leaking into the intake. It can either leak through the regulator diaphragm, or from a clogged/faulty injector.

Since you've replaced the regulator, you likely have a faulty injector. Determining you've got one leaking is easier than figuring out which one is leaking. You may get lucky and find it if you remove the plugs with the engine cold - one cylinder will smell of fuel. I'd suggest buying a cleaned and tested set (ebay has them) and swapping them all out at the same time. This route is usually the same price as buying one new injector at a parts store. But how you fix it is entirely up to you.

 

Number one through seven plugs are all fouled out every time. No oil on plugs. Smell very strongly of fuel. It starts almost every time quickly. Could it be the fuel pressure too high? I am a truck driver. Am learning this as I go. I bought the truck 30000 after the rebuild. Would a distributor do this?

 

No a distributor would not cause this I don't think. Is your o2 sensor going bad or maybe an exhaust leak upstream of your o2 causing your o2 sensor to read lean and making it dump more fuel. I would start with checking your fuel pressure I think you can rent a pressure test at autozone or advance auto. If fuel pressure checks out I would go ahead and replace all of the injectors with rebuilt tested good units they probably have a lot of miles on them. I would work on getting this fixed quickly because running to rich can cause you to wash the oil off of the cylinder walls and cause the pistons rings to score the walls up.

 

That is why I have spent a lot of money buying oil and filters. I do not drive the truck yet. Not until fixed.

 

Did you say you replaced your fuel pump if so what did you replace it with a stock one or a high volume pump.

 

It was replaced before I got it. That guy is the one who just threw parts at it. I was thinking a bad o2 sensor