new swap
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New User
Joined: Sep 2010
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new swap
Hi guy's I'm a new member, but a long time ford owner/rebuilder.
I recenly rebuilt and installed a 1992 351W EFI into a 1993 F150 to replace the blown 302 EFI, after some tweaking it starts and runs good (almost 2,000 miles) but I think the computer, EEC-IV
needs updating. I know there has been alot of discussions on weather or not you need to swap out these when changing motors, but It continues to have some black smoke (rich) blowing out, I installed headers so maybe the OX sensor is bad ? my question is, would a code reader tell me if the original 302 computer and EEC-IV was not going to work with the 351 ?
thanks
I recenly rebuilt and installed a 1992 351W EFI into a 1993 F150 to replace the blown 302 EFI, after some tweaking it starts and runs good (almost 2,000 miles) but I think the computer, EEC-IV
needs updating. I know there has been alot of discussions on weather or not you need to swap out these when changing motors, but It continues to have some black smoke (rich) blowing out, I installed headers so maybe the OX sensor is bad ? my question is, would a code reader tell me if the original 302 computer and EEC-IV was not going to work with the 351 ?
thanks
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New User
Joined: Sep 2010
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yes the firing order I belive is the same, it was a standard 302, and I rebult the 351 .30 over and dropped it in, I just wasn't sure if the computer would recognize the 351 as far as fuel delivery would go, and if the EEC-IV for the 302 ( I used the original distributer) would be ok for the timing ?
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
your efi is speed density or maf? i didnt think Maf was available until 94 for the 5.0/bronco/f150.
if your running speed density then you MUST change the computer to match the motor. the injector wiring should be the same as it was on the 302. the spark plug firing order of course would more than likely be different. Check your haynes/chiltons manual for that info. I will also still pull codes.
Whats your timing at and did you set it with the spout unhooked? i would also check your fuel pressure at the rail. smoke at that low of mileage isnt good
if your running speed density then you MUST change the computer to match the motor. the injector wiring should be the same as it was on the 302. the spark plug firing order of course would more than likely be different. Check your haynes/chiltons manual for that info. I will also still pull codes.
Whats your timing at and did you set it with the spout unhooked? i would also check your fuel pressure at the rail. smoke at that low of mileage isnt good
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
No.. but it will tell you if there are any sensor problems and it certainly appear that you may have some. The 5.0 EEC will run the 5.8 but it should be lean if anything.. not rich. Pull the codes and go from there.
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thanks to all , great info here,
it is a speed density motor so I'm headed for the salave yard to find a 'puter and swap that out, the timing was set to 10 dgres BTDC with the spout disconnected but not shorted, I read somewhere that it should be shorted, anybody know for sure? I'm getting a code reader today as well so hopefully that will solve some questions as to the "rich" condition. the smoke isnt really that noticeable but you can smell the unburned fuel so I'm hoping that we have a bad 02 sensor.
it is a speed density motor so I'm headed for the salave yard to find a 'puter and swap that out, the timing was set to 10 dgres BTDC with the spout disconnected but not shorted, I read somewhere that it should be shorted, anybody know for sure? I'm getting a code reader today as well so hopefully that will solve some questions as to the "rich" condition. the smoke isnt really that noticeable but you can smell the unburned fuel so I'm hoping that we have a bad 02 sensor.
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From: Chesapeake, Va.
Don't go cheap on the code reader. Get the best one you can afford as there will be times you will need the additional scanning ability.
Ford changed the firing order on the small block back in the late '60s, I was working at H-M at the time and as the same cams were used it was assumed that the reason was to eliminate spark leaking from one plug wire to another on adjacent cylinders, eliminating a crossfire condition with the wires of the era. A visiting Ford engineer confirmed the assumption. Of course the firing order must match the injector signal from the ECM of todays vehicles.
Ford changed the firing order on the small block back in the late '60s, I was working at H-M at the time and as the same cams were used it was assumed that the reason was to eliminate spark leaking from one plug wire to another on adjacent cylinders, eliminating a crossfire condition with the wires of the era. A visiting Ford engineer confirmed the assumption. Of course the firing order must match the injector signal from the ECM of todays vehicles.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
because your dealing with Speed Density you wont get much from a hi dollar scanner because frankly the computer doesnt have what it takes to do so. You can pull codes using a paper clip if necessary on your current ride.
also being speed density which runs a bank fired injector setup it wont follow the principal of the plug wire matching the injector wiring.
if this rig had MAF then yes the injector and plug wire must be on the same firing order as the CAM.
also being speed density which runs a bank fired injector setup it wont follow the principal of the plug wire matching the injector wiring.
if this rig had MAF then yes the injector and plug wire must be on the same firing order as the CAM.
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