88 351W EEC Codes?
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From: La Grande, OR
88 351W EEC Codes?
I swapped in a 351W for a blown 302, and thanks to help from numerous people on the site, this has been an enjoyable fix. However, I have one more question. On all the threads concerning these 351W-302 swaps, a 351W computer (EEC Module) is recommended. I looked on fordfuelinjection and found three different computers that seem to work with mine (SD-Bank/C6), my question is does it matter which one to get, or will either work, and if so, why are there three of them? Thanks for the help
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From: Topsfield, MA
Theres a whole bunch of different ones listed - most of them are pretty much the same. The main differences are such things as one having an E4OD vs a manual. The E4OD is computer controlled and the manual is not and doesn't contain the programming for controlling an E4OD. Otherwise, the differences are very minor and are just minor programming changes.
Your main concern is having the pin locations line up (which they should but is worth a double check) and that it's a 351 SD computer if that's what your running (instead of MAF).
Your main concern is having the pin locations line up (which they should but is worth a double check) and that it's a 351 SD computer if that's what your running (instead of MAF).
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From: La Grande, OR
ok, so it doesnt matter which of the three modules with the numbers listed on fordfuelinjection.com as long as the pins line up and it is for my 351 with a C6 thats for speed density instead of mass airflow, so I could get either of the three?
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ok, so I pulled out my existing EEC, matched the codes from fordfuelinjection, and guess what, come to find out, I have an AOD instead of a C6 (Computer code GT). The only problem is, looking at the list of codes for the 5.8 (351), there doesnt seem to be an EEC that was made for it coupled to an AOD (trans code T), so now what should i do, will the other eec's work, the ones that don't have any transmission specification or what? thanks for the help.
Post Fiend
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From: Topsfield, MA
The AOD and C6 are both not computer controlled. I saw several codes listed there (more than 3) that would work for your application.
For example - my truck has a mustang MAF computer for a AOD - but I have a 5 spd. It doesn't matter because neither of them have computer controlled trannies.
C6/AOD doesn't matter - as long as you don't have an E4OD computer that is a 351 speed density computer you should be good to go.
For example - my truck has a mustang MAF computer for a AOD - but I have a 5 spd. It doesn't matter because neither of them have computer controlled trannies.
C6/AOD doesn't matter - as long as you don't have an E4OD computer that is a 351 speed density computer you should be good to go.
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From: La Grande, OR
so will those EEC's that dont have a transmission specialty work? I wasn't sure that a C6 computer would work the same as the AOD, since the C6 is a 3 speed, and the AOD is a 4 speed. so will any of those SD listings work except the ones for the E4OD's? sorry for my ignorance, but thanks for the help.
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Lead Driver
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From: Concord, NC
As long as it isn't for the electronic automatic it will work (C6, AOD, it doesn't matter which). I'd try to get one for a C6 first, and if you can't get one, then a 5 speed computer will work. The automatic computer will have a couple small differences in timing tables from the manual transmission computer, but either will run the engine. The ones for the electronic automatic look for the transmission and will set codes if there isn't one.
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From: La Grande, OR
Thanks for all your help guys, and I should start another thread for this, but I have yet another question. On the block of the 302, at the very back, there is a sensor (sending unit). Do any of you know what that is, because there isnt one there on the 351 (temp? tach????). It is on the block, and has a 2-prong connector for the wiring harness, but there doesnt seem to be one on the 351(note that it is a '94 engine). Thanks again for all the help.
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From: Central NY
The only sensor I know of on the back of the engine is the knock sensor. It wasn't used in all years which is why your 'new' engine might not have it. I couldn't tell from what you posted what year your 302 was, but I'm pretty sure the 88's, 302 or 351, didn't have one.
Merry Christmas!
Tim
Merry Christmas!
Tim
Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
Yes that is the knock sensor - which is a 302 only type deal. The 351 did not have it. You can leave the sensor plugged in and uninstalled so the computer sees it but you have to understand the purpose of the knock sensor and what to do in it's absense.
The knock sensor will sense pinging/detonation and the computer will adjust the timing to stop detonation. It shouldn't do this unless there is a problem, but the computer will make adjustments. Since the 351 doesn't have it, you'll have to understand that if the engine does ping that it will cause engine damage and you need to not let it happen if you hear it.
The knock sensor will sense pinging/detonation and the computer will adjust the timing to stop detonation. It shouldn't do this unless there is a problem, but the computer will make adjustments. Since the 351 doesn't have it, you'll have to understand that if the engine does ping that it will cause engine damage and you need to not let it happen if you hear it.
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From: La Grande, OR
so since the sensor is on the 302, should I complete the circuit in that plug (2-prong), or just leave it like it is. the way i understand it , the circuit is only supposed to complete itself when the sensor finds a ping and therefore sends the signal, so should i just leave the empty plug hang and tape it off? thanks, i felt dumb when i came back in and looked at my haynes manual, as it says that that that is the knock sensor. and i was wondering the same as popa tim, how did the 351's handle knocking and pinging if they didnt have a sensor? or is that just not a common thing with a 351
Post Fiend
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From: Topsfield, MA
Originally Posted by Popa Tim
so 351's never had a knock sensor? how did they deal with ping?
The computer just doesn't adjust for knock - it shouldn't really knock anyway unless someone tweak'd the setup. They got around it by making the parameters on the safe side of things and not pushing the envelope of detonation.
If you have the knock sensor, plug it in and leave it tied up and uninstalled in the block.
Lead Driver
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From: Concord, NC
They only used the knock sensor on 302 truck engines - none of the mustangs (not sure about the other cars) used a knock sensor. The only reason I can think of is that Ford was pushing the limit on the 302 timing to get as much power as possible out of it, so they wanted a safety device.
When you install a 351, I'd recommend getting a 351 computer for it. The 351 computer doesn't need a knock sensor, so it can be completely removed without any consequence.
When you install a 351, I'd recommend getting a 351 computer for it. The 351 computer doesn't need a knock sensor, so it can be completely removed without any consequence.