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1986 emissions nightmare

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Old 10-12-2018, 12:40 AM
steelsail
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1986 emissions nightmare

My 1986 F-150, with the 4.9 motor, has been ruthless to fix and I was seeking some guidance as I'm attempting to keep the stock fuel system. I bought a "direct fit" MagnaFlow catalytic convertor w/ pipe and attempting to join the 12" stem to what I have left to connect the smog pump. I don't have a welder and was hoping to use some sort of coupler to join the 2 (outside diameter of both steel pipes is 3/4"). As the connection will be hot, I was thinking of perhaps buying a piece of copper pipe and using clamps, such as cable clamps, to make it air tight.... thoughts?

Now for the whopper. I've tried running the codes with my reader and have been unable to get them. I've cleaned the connections on the red multi-pronged connection and the single connection on the red/white wire. I, of course, have the key on, and even put the manual transmission in neutral while holding the clutch in (after powering up the reader and pressing test/hold). I even took apart the computer and saw no breaks on the back of the board. What I have not done, however, is start the truck, let it run for 10 minutes, turn the ignition off, turn the key back on and run the "engine off key on" procedure; I'm wanting to get it running decent before torching the brand new cat with a super rich mixture. Is it possible to get codes without warming the truck up?

I'm wanting to keep the stock emission system as all components are present and appear to be in good shape... but a fried computer may end up being the straw that results in my bully getting durasparked.

Thank you in advance for your help with this... Ray
 
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Old 10-12-2018, 12:46 AM
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Do you have emissions testing?
 
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Old 10-12-2018, 12:55 AM
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I don't but am trying to get the best possible fuel economy. My last bully had half the emissions stuff missing so durasparking it was an easy choice. This one has low miles and is bone stock... so it's tougher for me to trash the emissions.
 
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Old 10-13-2018, 12:24 PM
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Still no codes

I am very grateful to those who have helped with my silly questions on this forum... everybody's feedback is helping me make the most reasonable decisions moving forward.

So, I bolted on a 4 foot pipe to the manifold and left the catalytic convertor off and the air pump line disconnected (neighbors aren't too happy with me). I did find a Walker kit to properly connect said smog/air pump. However, I'm stumped on getting codes still.

I did warm the truck up and felt the outlet of the air pump and there was zero pressure and/or airflow. I tried following the procedure for the code reader to a T; hooked up reader (as seen in picture), made sure reader off, started truck, warmed it up, turned ignition completely off, waited 10 seconds and turned ignition on to observe "emissions light" cycle on/off, turned reader on and pressed test/hold, got back in truck and held clutch in with tranny in neutral... no codes and nothing in the memory.

(1) Is it safe to assume the smog pump is not properly working as it is not blowing out the outlet?

(2) Is it safe to assume computer is not working as no codes are being read?

Thanks again for helping folks

 
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Old 10-13-2018, 03:39 PM
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I have never used one of those all-in-one readers before. I have always used the testlight or old analog voltmeter like in this link.

EEC IV Self Test hookup

If you look at the connection diagrams in the above link, you will see the indication device, whether it is a testlight or old voltmeter, uses the battery + for power, and the computer grounds terminal #4 to give the code indication. How does your little code reader get power? It needs to get power from somewhere to get an code indication. If it gets power from the plug somewhere, maybe yours is missing power. I see that it has numbers on the screen, does it take a internal battery in the reader?

Why don't you try the method in the above link and see what you get?
 
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Old 10-13-2018, 03:50 PM
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The reader I have is battery powered and works good on my 89 as it records the 4 or so codes that my Ranger spits. But, the old 86 F150, might do good with a test light as I just want to make sure the computer is working... that's a good idea and I'll definetely try it. Thanks much!
 
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Old 10-13-2018, 10:30 PM
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There have been other posts of members not being able to use readers for the same reason, just would not work and think they all used the test light.
Dave ----
 


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