Put another tally mark down for the EEC-IV to DSII swap. All i have to say is . I'd been considering it for about a week since i had everything to do it, but yesterday my truck decided for me.

I came out of school, fired the truck up and it started idling really rough. I then took off and it kept wanting to stall out, then on the way home it woudn't go over 40 no matter what (i can normally do 55 in 3rd if i push it). Got home to check the computer for codes and got NOTHING, nothing at all. So, it came dow to either go buy the computer and wrestle under my dash for a couple hours, or spend 1-2 hours in the engine bay. An hour and 15 minutes later i had it tuned and pulled out of the drive.

Talk about power, consistency, and driveability. My truck has NEVER run this well or burned this clean, it always had a gassy smell to the exhaust and an intermittent miss at idle. I can thump the gas and it won't stumble and it will pull hills it wouldn't pull in 4th before.

My advice is that ANYONE with the EEC-IV that has issues should look into this swap IT IS ABSOLUTELY WORTH IT!!!


Justin

 

What parts did you use and expalin how you did it...am thinking about doing mine too...its a 86 E150 5.0 EFI

 

Can't help you on the EFI swap, I did it to my carbed '85.
For a carbed truck all i needed was a DSII carb, dizzy, coil, and spark module. I disconnected the engine wiring harness from the firewall harness, pulled the carb and pulled the dizzy (after indexing it to TDC #1). the spark module then connects into the firewall harness-It only goes together one way-the dizzy slips in, the coil gets mounted up, the carb bolts on, base time it, fire it up, tune and time it, and you're off. I left all of my emissions stuff hooked up for now, i know a shop with an exhaust analyzer so i'm going there next week to start stripping stuff off.


Justin

 

Get a Flowmaster, great sound an pep....thz an good luck

 

Hoxiii,

A couple of questions for ya:
If you have air conditioning, did you install an idle speed booster, or did you use the unit off of your eec-iv carb?

What did you do about those dang blasted vacuum lines?

I did the swap 2 weeks ago, the truck fired right up. But there is a serious vacuum leak...somewhere. Also, the carb needs to be tuned. Next w/e project.

 

No A/C so i can't hep you on that part. My donor carb had the idle booster as it came off an A/C truck, but i tossed it. As for the vacuum lines I hooked them all back onto the equivalent ports on the DSII carb, i only wound up plugging one port, the one that points to the D/S about 1/2 way up the carb.
I also removed one line that came from the vacuum tree. the line came off towards the front of the truck all the way on the end of the tree about 2" then went to a Y. i removed the 2" and the Y and the line that came off of the angled side of the Y, then hooked the straight line into the tree. I dunno what the line went to, but it was left over when i was done so it went bye bye. the only creative routing i had to do was for a port that hooks into the automatic choke. it's a threaded fitting that is on the d/s on one carb and the p/s on the other. i got a piece of 3/8 fuel line, put a nipple fitting into he carb, and hooked the lines together. seems to work allright.

SO, all and all i just left the vacuum mess alone, only disconnected what i had to, reconnected what i could, and got rid of what i couldn't.

So far the nly issue i've had is that occaisonally the choke sticks on the "new" carb, but that' easy enough to unstick.

Justin

 

Thanks for your reply. You gave me some good information. Sounds like you have emissions testing in Missouri. Put an entry in this thread as to how your truck does, when you get it tested. In Arizona, we also have emissions testing. My truck is not due yet. This is my only worry at this point. Thanks again!

 

My truck's not due up for another 2 years at state, but i am going to have it independently analyzed later on this year. I also remember what the vacuum line i got rid of went to. there's this little thing that looks like a vcuum advance canister on the D/S of a EEC carb by the auto choke. besides that everythng else styed intact.

Justin

 

im considering the same swap.....I have an 84 Bronco with a NP435, NP208, 8.8 and ttb 44 front....I only bought it for $50 and it runs ok, just sucks cuz you cant disconnect all of the emissions bullcrap that doesnt work. It runs fine until the engine heats up, and then its game over. Stupid thing backfires a couple times and then dies..what year did they use Duraspark 2? I'm going to the junkyard tomorrow to pick up a complete slave cylinder setup for the bronco...it would be nice to grab a distributor while im there

 

Duraspark II was used from 1976 up to and including 1983.

 

The sticking choke could be due to the steel "brake line" .Mine was wrapped in insulation but was rusted off were it stuck into ex. manifold. It keeps the choke open after electric times out.