Help needed 5.0 FI
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New User
Joined: May 2002
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From: Leesport United States
Help needed 5.0 FI
I have installed a 96 5.0 in my 63 Unibody and need some good help.
1) it is running EXTREMELY lean --1 minute running and headers are turning red
2) can I eliminate the TAB/TAD sensors and what do they do.
I have eliminated the EGR and air pump system already
Thanx in advance
Tim
1) it is running EXTREMELY lean --1 minute running and headers are turning red
2) can I eliminate the TAB/TAD sensors and what do they do.
I have eliminated the EGR and air pump system already
Thanx in advance
Tim
Post Fiend
Joined: Nov 2002
Posts: 9,987
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From: Memphis, TN
Help needed 5.0 FI
TAB & TAD are solenoid vacuum valves - not sensors. They control the combination bypass/diverter valve (the big black plastic one with 3-5 heater-size air hoses) which directs air either to the heads or to the cat. If the air pump is gone, they're not doing anything, but unplugging them will turn on the engine light.
It would be a LOT easier to diagnose if you kept it stock, but '96 was probably the worst year of engine for you to choose. It was the first year for OBD-II, so you can't pull the codes yourself. If you had used a '94-95 MAF engine, it would be EEC-IV.
I put an '88 5.0L in this '75 Bronco, but I kept EVERYTHING on the engine working normally. Even though I had to use a Crown Vic plenum to clear the hood, it runs like it's still in the '88 F-150.
It would be a LOT easier to diagnose if you kept it stock, but '96 was probably the worst year of engine for you to choose. It was the first year for OBD-II, so you can't pull the codes yourself. If you had used a '94-95 MAF engine, it would be EEC-IV.
I put an '88 5.0L in this '75 Bronco, but I kept EVERYTHING on the engine working normally. Even though I had to use a Crown Vic plenum to clear the hood, it runs like it's still in the '88 F-150.
Last edited by steve83; Jul 13, 2003 at 06:14 PM.
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
Help needed 5.0 FI
Steve- please tell me how you cannot pull the codes on OBD-II? The cheap $25 Autozone code reader is for OBD-II. This system actually gives you more info than the old systems.
Post Fiend
Joined: Nov 2002
Posts: 9,987
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From: Memphis, TN
Help needed 5.0 FI
The cheap code readers are for EEC-IV, but you don't need them - EEC-IVs will spit out codes by using a paperclip. Here's how. But OBD-II computers require a scantool, and the cheapest one I've ever heard of was $130 on sale. If you can get codes out of a '96 computer with a $25 reader, please post instructions. I'm sure there'll be a LOT of interest. 
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From: Leesport United States
Help needed 5.0 FI
so If I don't get this all worked out. What will the EEC-IV give me as a benefit and can I change the harness and computer to a 94-95?
But I don't understand the lean issue!
Fanatic
But I don't understand the lean issue!
Fanatic
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From: Louisville,Ky.
Help needed 5.0 FI
Could it be a timing issue? Exhaust restricted? Vacuum leak? What did you get the engine, computer out of. An Explorer/Mountaineer? I thought everything else had Mod motors then.
Could be low fuel pressure, or short injector pulses.
Jimmy
Could be low fuel pressure, or short injector pulses.
Jimmy
Post Fiend
Joined: Nov 2002
Posts: 9,987
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From: Memphis, TN
Help needed 5.0 FI
I'm not familiar enough with OBD-II to tell you whether or not you can convert back to EEC-IV by just changing the harness & computer, but I'd guess YES. The benefit would be that you could pull the codes at home.
Other than pulling the current codes, I can't tell you much about the lean condition, except the obvious - too much air is getting in, or the computer isn't adding enough gas. Maybe the HEGOs are reporting rich, so the computer is leaning it out. Maybe the smog pump (if it has one) is overactive & putting too much air into the exhaust manifolds.
Other than pulling the current codes, I can't tell you much about the lean condition, except the obvious - too much air is getting in, or the computer isn't adding enough gas. Maybe the HEGOs are reporting rich, so the computer is leaning it out. Maybe the smog pump (if it has one) is overactive & putting too much air into the exhaust manifolds.
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From: Leesport United States
Help needed 5.0 FI
the engine and trans are from a 96 F150. I got the whole setup from a rolled truck with 16K miles so it's hard to imagine a timing issue but I am working on going over everything. I am guessing that the computer is leaning it, I'm just not sure why. Plenty of air going in and out FOR SURE!
Thanks for all the input !!!!
Tim
Thanks for all the input !!!!
Tim
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Post Fiend
Joined: Nov 2002
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From: Memphis, TN
Help needed 5.0 FI
On my '83, I cut holes in the shift indicator blockoff plate, mounted bulb holders in the bottom, printed on regular paper, and then covered the paper with taillight repair tape to give it color. It works GREAT! 
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Last edited by Ford_Six; Jul 28, 2003 at 12:52 AM.
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From: Louisville,Ky.
Help needed 5.0 FI
Are you running before and after cat O2 sensors? If the ECM doesn't see the drop in emissions from before to after the cat, it may be trying to lean it out to pass emissions.
Jimmy
Jimmy
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Help needed 5.0 FI
IF (an I doubt this) the wiring is set up corectly. The engine will become lean if the engine is not warming up to temp. check the temp sensors for the computer.
I don't think the 96 computer idea was a good one. get a 88-93 computer and you'll be happy
I don't think the 96 computer idea was a good one. get a 88-93 computer and you'll be happy
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From: Leesport United States
Help needed 5.0 FI
What is involved in using the older computer? Changing what? I know that I cannot just plug it in, but must I change all the sensors , etc.
I have gotten rid of the lean issue-I think- but there are still a few other things to work on. Time is a precious commodity , so as you can tell I work on it when I can.
Thanx to all !
I have gotten rid of the lean issue-I think- but there are still a few other things to work on. Time is a precious commodity , so as you can tell I work on it when I can.
Thanx to all !
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