Computer Differences?

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Nov 23, 2003 | 05:33 AM

farlight7

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Joined: Dec 1999

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From: Hubbard USA

Computer Differences?

Just finished a 302 to 351w swap into my 1989 F250, 4x4, M5OD.
The engine came out of a 1990 E350 with autotranny.

I also swapped computers.

After the swap, the truck started up on the first try. It will run good for about 3 or 4 minutes, then it will start bucking. If I let off the clutch and coast, it stops and runs OK again.

A mechanic friend suggested that there might be an issue with using a computer out of an automatic in a truck with a manual tranny.

Yes, no? any other ideas?

Thanks.

Nov 23, 2003 | 07:15 AM

JAMES-NEW-FORD-OWNER!!!!

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I WOULD RECOMMEND U GET A STANDARD ECM FOR THAT AND GIVE IT A TRY BECAUSE THERE ARE DIFFERENT PERAMETERS INSIDE FOR SPEED AND ENGINE LOADS.......WHAT AUTO TRANY DID THE ECM COME FROM???????PLEASE REPLY FOR SUGGESTION

Nov 23, 2003 | 05:32 PM

EPNCSU2006

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Joined: Nov 2002

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From: Concord, NC

You have to have a computer specifically for automatic or manual. I've heard of many instances of people running the stock 5.0 computer on a 5.8 with no problems, but I don't have any first hand experience with that.

Nov 23, 2003 | 06:20 PM

farlight7

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Joined: Dec 1999

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From: Hubbard USA

I'd have to go back to the salvage yard to find out what tranny was in the van. I still have my computer for the 302, so I could try it again.

Thanks

Nov 23, 2003 | 06:29 PM

pfogle

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Joined: Feb 2003

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From: Oak Harbor, OH

I would try the 302 computer, if that doesn't work you will need to find one from a 351/manual truck

Nov 23, 2003 | 06:56 PM

aikigod

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Joined: Sep 2002

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From: Alberta

Doesn't the 5.0l have a different firing order than the 5.8l? I was under the impression that you couldn't just interchange the two computers. Or maybe you just need to swap the plug wires to the proper order in order for it to work? Or maybe I'm smokin' too much crack? I dunno, hopefully someone more knowledgable will chip in...

Nov 23, 2003 | 07:26 PM

CGreene

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Joined: May 2003

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From: bainbridge, ga

I put in a mustang A9L puter in my 92 for a maf conversion. I had to change some pinouts on the factory harness to match the mustang eec. If the van had a E40d you will need to get a maual EEC or one for an AOD. Check the wiring diagram from the van adn your truck.

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Nov 23, 2003 | 08:49 PM

EPNCSU2006

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From: Concord, NC

Quote:

Originally posted by aikigod
Doesn't the 5.0l have a different firing order than the 5.8l? I was under the impression that you couldn't just interchange the two computers. Or maybe you just need to swap the plug wires to the proper order in order for it to work? Or maybe I'm smokin' too much crack? I dunno, hopefully someone more knowledgable will chip in...

Yes, the firing orders are different. But since the trucks use batch fire injector sequence, there is no need to change anything there. The plug wires would have to be changed to correspond with the new firing order. I'd try the old computer before I did anything else. I think that since the computer from the van is for an automatic, that is where your problem lies.