Does anyone know when Ford fuel injected the 302? Also, how would I know if an engine is a 5.0 or 4.6? Does a fuel injected engine use the same camshaft as a carbureted one (still speaking of a 302)?


-Thanks.

 

I believe the 302 got injected in the trucks in '87 with the body design change. I don't know what the 4.6 looks like, but the 302 has "5.0 Liter" in raised lettering on the upper intake manifold.

Jason

 

First, there was the CFI (Central Fuel Injection) fuel injection from 84 and 85. This was a throttle body style fuel injection atop a carb type intake manifold. CFI performed poorly compared to a four barrel carb, and it didn't tolerate any engine modifications that increased airflow. The CFI 302's used flat tappet cams with the 351w firing order.

The first Sequential Electronic Fuel Injection (SEFI) system was on the 86 5.0L HO. The HO SEFI motors used a roller tappet cam that was first used on the four barrel carbed 85 5.0L HO. These roller tappet cams use the 351w firing order. The Computor was speed density until 1989 (88 in California), after which it was mass air.

The regular pass car SEFI motors as used on Crown Vics, Town Cars ..ect.. came in 87 and are similar to the Mustang HO in appearance, but the throttle body is on the drivers side of the upper intake, instead of on the passenger side. The pass car SEFI motors used a flat tappet cam that uses the old 289/302 firing order. The pass
car SEFI motors had Speed Density computor controls.

Truck 5.0L motors also got EFI in 87, as reported by Mr Roehl. The truck motors used speed density and the cams were flat tappet(289 firing order), untill the mid 90's. The last truck 5.0L's had mass air computors and roller tappet cams. The 95-96 truck 5.0L use the 351w firing order. My guess is that they just started using the Mustang 5.0L HO short blocks in the trucks, that had been built in the Cleveland engine plant. I had a 96 F150, and in my experiance the later truck 5.0's had much more punch and got noticably better fuel milege than the earlier truck EFI 5.0's.

 

The 4.6 liter motors are a completely different design from the 302, although there is a full on racing version of the 4.6, at 5.0 liters displacement now. The 302 (5.0L) pushrod motor is actually a stroked 289. The 289 design dates to the early 60's, and the 4.6 dates from the early 90's. The 4.6 is called the Modular Engine (because some V6 and the V10 Triton motors are based on the same design with just more or less cylinders) and it has overhead cams, with no pushrods. The cams are chain driven. Because of the overhead cam architecture, the Modular engines are very wide and fill up the engine bay like a big block motor, although 4.6 liters is only 281 cubic inches. They look huge. The Modular engines will have no distrubutors or no carbs on a production version.

 

The 302 went multiport EFI in either 85 or 86 in the trucks. The 4.6 is quite large compared to the 302, externally, and looks nothing similar (mainly since it is OHC). The 4.6 first appeared in crown vics around '92 I believe, but didn't make it to the mustangs until '96, and the F150's in '97.

Edit: guess these guys beat me to the punch while I was in class

 

Awesome response! Thanks guys!

Now, all I need to do is to identify what I have in my truck. I was told by two mechanics and the previous owner that it is was a fuel injected 302 (figured that out because of the missing mechanical fuel pump provision). However, an intake manifold for carburation was installed in place of the fuel injection manifold.

Man...I really need to get this figured out so that I can get the truck running.

Thanks again guys!

 

What year truck is it? Is it the original motor? It may be CFI.

 

I second the question for what year truck you have. I don't think Ford ever used CFI on the trucks, but I could be wrong. The CFI manifold would look like a carbureted manifold.

 

The truck year is 1985 but it is not the original motor. The auto shop and the previous owner confirmed that when I asked about the missing mechanical fuel pump provision.

It was fuel injected but someone put an intake manifold on it for carburation in order to match the VIN (must be done in order to pass the saftey and emissions inspection in Missouri).

 

Oh boy.. If it's an EFI motor you will need a different distrubutor than the TFI type used on EFI motors, as well as rigging up some kind of carb friendly fuel delivery system. The TFI dizzy is designed to work with an ECC IV computor. A carb motor needs a dizzy with vacuum or mechanical advance. You need to also determine if the engine uses a roller or flat tappet cam, so you can get the right distributor gear.

 

It came with a DSII distributor (vacuum advance) and the previous owner hooked up an inline electric fuel pump. Everything seems to be fine other than the fact that it just stopped running about three weeks ago. It just wouldn't turn over one day.

The only thing that I have done to it sense then it replacing the existing coil. My next objective is to replace the remaining ignition components (dizzy, control module, etc). Then I'm hoping I can get it in the transmission shop for some more work. It never ends. LOL


Thanks again for the input.

 

Oh, how can I determine what type of camshaft I have in the engine?

 

The only sure way is to pull off the intake and look at the cam. A roller tappet cam will have X shaped retainers to keep the roller tappets from spinning, and these retainers are in turn held into place by a device called the "spider". Of course the roller tappets will have rollers on them.

If the motor follows the 351w firing order (13726548) then it is more likely that it has roller tappets, but it is unlikely that a firing order of 15426378 will be used with roller tappets. However that isn't a 100% sure way of telling. Sombody here may know a better way.

 

Do you have any pictures?

Do all post '85 blocks have roller tappet camshafts?

 

I would seriously doubt your engine has a roller camshaft. These were only incorporated into mustang 5.0's and 94+ truck engines. Furthurmore, I don't even know if an 85 block was drilled to accept the roller retainers or even if it has enough room for the larger roller lifters.