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Speed density!!! Arrrrgh!

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Old 03-14-2013, 02:10 AM
  #11  
302travis
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Originally Posted by Thomasje3
It misfires or misses when "lugging" up a hill in overdrive?
There is a difference. I have dealt with a similar condition in both SD and MAF systems and I ended up finding that the coil was shorting internal. Found the condition even worse when everything is hot under the hood. Check the resistance on both the primary and secondary side. I Think the secondary resistance should be 15K or greater homes if memory serves. I can't remember the primary resistance.
Also, install a wideband in your exhaust and hook up to a guage and keep an eye on your A/F ratio. In theory, having the O2 in just one header would at worst not correct for an issue with a cyl on the other bank. Be careful installing the O2 in an H/X pipe as it may be to far down stream and too cool for the O2 to opperate properly. There ate also flow issues with an H pipe that can hamper an O2 operating properly.

Good luck
I will look into this for sure. But I would tend to think not, only because I replaced the coil about 2 yrs ago when i was having the same problem and it didn't fix it. But it at least ran great for about one day lol But I think that day was just luck more likely. Wires I've replaced a million times, never fixed the problem with wires. Which brings up another question, because, I bought the Hooker Competition Full lengths 5 years ago and I HIGHLY recommend ANOTHER BRAND of headers for our trucks because these greatly interfere with the stock 45 degree plug wires on about 3 different cylinders and will force you to use a 90 degree boot instead on the cylinder head ends. But That made me think... Could a 90 degree boot that close to headers and the head itself cause a good chance of arcing? Because 90 degrees are usually only on distributor side only right? And don't need as much of a boot because the dist. cap is farther from any metal as opposed to the cylinder head side of the wires. So, could it be i need to find a way to use a 45 boot without it burning everytime on the headers? I was thinking plug wire heat wrap, but wasn't sure if it would prevent them from burning because the boot will sit RIGHT ON TOP of the d*** Hooker headers if I use anything other than a 90 degree boot! They perform well, but honestly I would hope a different set of headers would not have this interference issue i would hope. Enjoy this novel, and I hope everything I have posted helps narrow things down some. Please read the posts I made at the end of page one a few minutes ago as well
Old 04-04-2013, 08:47 AM
  #12  
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I have long tubes on my '92 Bronco. I extended the harness, and put the O2 sensor in the collector on the passenger side. The O2s have heaters into them, so long as they're not the single wire style, so putting them too far away really isn't an issue. I made sure to do all that I could to make the computer think its all stock. I welded on a tube to the first header tube for the EGR. I kept the smog pump, and have that all hooked up. I also cut up an Mustang H-pipe for the cats. All I did was replace the stock fuel regulator with an adjustable regulator to give it for fuel to compensate for the added flow.
Old 07-14-2013, 12:17 PM
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302travis
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Originally Posted by Atomic Monkey
I have long tubes on my '92 Bronco. I extended the harness, and put the O2 sensor in the collector on the passenger side. The O2s have heaters into them, so long as they're not the single wire style, so putting them too far away really isn't an issue. I made sure to do all that I could to make the computer think its all stock. I welded on a tube to the first header tube for the EGR. I kept the smog pump, and have that all hooked up. I also cut up an Mustang H-pipe for the cats. All I did was replace the stock fuel regulator with an adjustable regulator to give it for fuel to compensate for the added flow.
Ok so I did about the same thing, I have the O2 sensor in the passenger side and it's not a single wire. But I didn't put in an EGR tube, my cats are gone, and the smog pump is gone as well. But anytime I plug in the O2 sensor i'll get lean misfires. Question though, how much can you change the A/F ratio using an adjustable fuel pres. regulator?
Old 07-16-2013, 11:55 PM
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22* of timing under load will cause power loss. You are firing the plug too early causing a larger counter force to the compression. Back it off to about 14* to 16*. You will still have power and when you approach a hill, the engine will not have to work against itself as hard.



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