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Apr 4, 2008 | 09:30 PM

#16

doug1222556

Posting Guru

Joined: Mar 2007

Posts: 1,649

Likes: 2

Quote:

Originally Posted by JimsRebel

The sticker is not really on the radiator, it is just in front of the radiator cap. I just looked at mine, EEC IV and feed back carb, on my 86 F150 4x4 I6.

I have swap out the carb already (last year) and when it gets warm I will install my new VAC dizzy and GM 4 pin IGN module.

Here is my question... Can I remove the computer completely? Does the TACH or other stuff still need it? Does the Pos. side of the coil get it power from the Computer?
I would like to remove all the stuff that is just dead weight.

I am still running the air pump and it is currently always dumping air into the exhaust between the two CATs.But I might take the belt off the air pump to see if I can tell a difference with the MPG. I would like to open up both cats some day also, but it looks like a big job and if there are not pluged up I would not see any gas mileage increase anyway.

Thanks

Well here comes my $.02... IMO,.. let me say that again, IMO.. The biggest problems with performance and fuel economy with the early emmision motors came from changes made on the INSIDE of the motors, paticularly with the heads. They had lowered compressions and restricted exhausts, and unhooking every thing they bolted to the outside of those motors won't change that. For some reason, people think that if they unhook all the smog equipment, they'll have a motor just like they dropped in in the '60's. Once again, IMO, unhooking the emmisions equipment actually makes the motors perform worse than before, and only serves to create nightmares to anyone unfortunate enough to try to restore the vehicle to original factory emissions.

Apr 4, 2008 | 09:45 PM

#17

JimsRebel

Cargo Master

Joined: Mar 2008

Posts: 2,573

Likes: 207

From: Washington

Quote:

Originally Posted by doug1222556

I am outside the emission window due to the age of the truck so no one would have to restore it to original.
What years of I6 had the changes that drop the MPG? Compression ratio?

I had to change the carb as it was pissing fuel down the throat. The rest was just to "fix" changing the carb and to try to get better gas mileage. Or to say i lost the VAC adv.

Thank for the info.

Apr 4, 2008 | 09:59 PM

#18

Franklin2

Moderator

Joined: Jan 2001

Posts: 56,997

Likes: 2,744

From: Virginia

That is correct, the engine is tuned for all the emissions stuff, and most of the time there will be no difference, or it will run worse with it disconnected. The problem I have is when the emissions stuff breaks, then it becomes a nightmare to try to fix it. Converting the carb and the dist back to a non-computer setup should get someone on the right track to getting it running correctly though.

For someone trying to deal with the computerized carb setup, try doing a search on the web for "reading EECIV codes".

Compression ratios and power went down for most all types of engine in the early 70's. Don't worry about it too much though, most people can only afford to run 87 octane these days, so that matches the detuned engines about right.

Apr 4, 2008 | 10:31 PM

#19

doug1222556

Posting Guru

Joined: Mar 2007

Posts: 1,649

Likes: 2

Quote:

Originally Posted by JimsRebel

Sorry, do you have a shoehorn handy so I can remove my foot from my mouth. Unfortunately, I fell into the all-to-common trap of assuming your circumstances mirrored mine. I was thinking about small blockV-8's, and the straight 6's didn't suffer the same topsy-turvy changes. They already sucked! ( Just kidding.) I will say one thing though,... unless you plan to be buried with it, never assume someone won't have to return it to original. That being said, the easiest thing to do is mimmick an earlier year truck and get rid of or modify everything to match.