302-351 swap computer problems
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302-351 swap computer problems
All right I have a long one...sorry! I have a 1988 F-150 with FI 302/AOD. Motor was weak, so I bought a 1991 E-250 with FI351/E4OD with a fresh engine (know history of van, is from my employer). After reading this forum I decided this was a good swap. OK, after installed (with correct flywheel) it would not idle right, missing and stumbling, also since truck is OD, @1500 rpm is cruising, it would surge. Have checked every sensor and are within range. Have found a ton of info from this forum. Finally got bored yesterday and pulled computer from van, and runs perfect. Codes have shown up about transmission: circiut failure to shift soelinoids, but runs smooth. I did leave the aod. Now the truck started to have this problem with 302, just figured it was bad engine. So my question is do I leave the van computer, or do I need to find the correct one for my application? I am thinking of similar year with 351/c-6. OR is there one for 351/AOD? I am wondering if my stock computer was going bad. It was also getting hard to start, turn over for a long time, then barely idle. Sorry for the long post, but this may help several people thinking of this.
Pat
Pat
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From: New Jersey
Right.
The EEC from the van is expecting to find, and operate, a E40D. Your truck currently has the AOD, correct? If so, that's why the computer is giving codes. It's not finding what it's expecting - a particular transmission.
The EEC from the van is expecting to find, and operate, a E40D. Your truck currently has the AOD, correct? If so, that's why the computer is giving codes. It's not finding what it's expecting - a particular transmission.
Post Fiend
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From: New Jersey
88-89 351-powered F-truck or E-van will have a usable EEC, as the E40D's didn't come out until later.
BTW, you can use a manual transmission EEC as well. Since the computer doesn't shift the transmission, it wouldn't matter.
BTW, you can use a manual transmission EEC as well. Since the computer doesn't shift the transmission, it wouldn't matter.
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From: Bend,OR
the van ecu will work but throw a tranny code but will not affect driveability. the correct ecu to get though would be a 351w/c6 ecu, the manual equivelent would be hard to find because they were rare.
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From: Easton,Ks
Originally Posted by EPNCSU2006
Doesn't the IDM still connect to the same pin on the computer though?
My mistake, I read it backwards, I had it as a 88 E250 and 1991 F150 that were different but the 88 F150 5.0 and the 1991 E250 5.7 Van are the same.
Unless my source diagrams are wrong.
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From: Easton,Ks
Originally Posted by Kemicalburns
how about a 5.8. the 5.7 is a chevy thing
I have two of them, a 351M in a 77 F250 and 351W in an 83 F150.
Last edited by subford; Jun 5, 2006 at 01:28 PM.
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Thankyou very much for the info. I am going to my favorite wrecking yard tomorrow to look. By the way, yesterday and this morning it ran perfect, but with check engine light on. This afternoon it seemed a little sluggish, and did not seem to be idling as smooth. I thought i was getting pretty literate on this ecu terminology: what is IDM?
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From: Easton,Ks
IDM (Ignition Diagnostic Monitor) is the signal that comes in to the EEC (Electronic Engine Control) module or PCM (Powertrain Control Module) at Pin #4 from the ICM (Ignition Control Module) Pin #3 or TFI (Thick Film Ignition system) module Pin #5.
Last edited by subford; Jun 5, 2006 at 08:33 PM.