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93 F150 5.0l running rough

 
Old 11-18-2016, 02:38 PM
  #21  
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I didn't read that correctly, my apologies. So, ALL of the plugs were soaked? Yeah, not sure what could cause that.
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Old 11-18-2016, 04:37 PM
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Correct, every plug had fuel on them. I dont know what to even go after next to try and fix this issue
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Old 11-18-2016, 09:08 PM
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Well not every injector of mine was sticking open, i know two in particular were though, they were basically rotten, as for the O2 sensor it wasn't throwing any codes and no warning lights, i just wanted the computer to have a fresh start so to speak with the swapped injectors, it relearns, i ordered it off ebay for 20 or 25 bucks if i'm remembering correctly, didn't break the bank so i figured what the hell, plus it's recommended at 60 to 90 thousand miles being changed and mine was at 120 000, it was something else to get the original out, finally ended up using a small pipe wrench and chewed the ever living **** out of it, but it finally came, that's after soaking it in penetrating oil over a couple days too.

What kind of mileage is the truck getting ? Like i said i was getting around 7 MPG, now its right at between 12 and 13 all city, honestly the injectors have paid for themselves in fuel savings over the summer.

Last edited by Energized; 11-18-2016 at 10:07 PM.
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Old 11-18-2016, 09:26 PM
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As for to much fuel flooding the motor, yes and no, it didn't really hurt that much when running except for the rougher idle but starting the truck after use would take longer because the cylinders were awash with fuel, if it sat all night it actually started better, like instantly, i'm thinking because it was basically primed all the time, now it always starts the same, typically a couple seconds before it fires and takes off. No more smell of fuel.

I had never actually changed injectors before, i was a little reluctant to try but one Saturday i said screw it and tore into it, it's not so bad really, i labelled everything with tape and matching numbers just to be sure i knew where each and everything went back together. Took my time, one injector was so rotten it came apart in the hole, i had to use a screw to tap into it to pull it out and a small pick to clean out some crud that prevented the replacement from seating, the pick was actually one of the most important and useful tools for the job, i never actually pulled the whole rail out either, it's not needed. Took around 5 hours for my first time, when i first started it up it ran horrible, i looked online and it's noted that air gets in the fuel rail, so that was causing a problem, after 10 or 20 minutes of running and a little spirited highway driving everything smoothed right out.
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Old 11-29-2016, 07:01 AM
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sorry guys ive been away, and couldnt get a chance to respond to any of yalls comments. but since i got back home yesterday i looked over the truck to see if i was missing anything, or trying to figure out once last time before i sent the thing to the shop to figure out what was wrong. but thank god i found my problem, so lastnight i went to take the egr valve off and as soon as a loosened the the nut from the egr tube, half the egr tube just fell to the ground. this whole time the vacuum leak has been from the damn tube. hopefully ill have a new tube on by this afternoon and see if that for sure fixes my problem.
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Old 11-29-2016, 11:19 AM
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Nice catch. It's easy to forget about that tube when it's wrapped in insulation.
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Old 12-05-2016, 03:17 PM
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So i finally got to put the new EGR tube on the truck this weekend, as well as a new fuel pressure regulator. My problem with the truck missing, and having hesitation got much better, BUT i am still having a slight shutter. whats weird is when i first start the truck it runs just fine and as it should but just as soon as if starts to get to temp is when the miss appears. Is there a chance that my problem is from a clogged CAT? Slight hesitation when i pull off like i have no power, and then once im up to a constant 45MPH. really getting annoyed with this thing
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Old 12-05-2016, 03:41 PM
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O2 sensor? From what I've read hereabouts the system is in "open-loop" until the o2 sensor gets warmed up, then it goes into "closed-loop". The usual first suggestion for poor closed-loop performance is to replace the o2 sensor, assuming no other obvious causes, of course.

You may want to do a backpressure test. This will show if your cat is clogged, or some other collapse or blockage has occurred in your downstream exhaust. You might be able to borrow the tester from Autozone or similar.

You can also hack an old o2 sensor down to the fitting and JB-Weld a hose connector into it. I won't say it's easy because it took me several hours and two tries to get a usable product, but it can be done. Then use your vacuum gauge to measure the pressure (assuming it has a pressure side). You want less than 2 PSI. <1 is even better.
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Old 12-06-2016, 10:12 PM
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I've replaced the o2 sensor already just the other week in hopes it would fix my problem. I don't have the tool to test the back pressure right now so I'll have to wait on that.
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Old 02-01-2017, 04:44 PM
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Ok so its been awhile since ive given an update on my truck so id like to give a little updated info since i have still not been able to get my truck running right. i Have managed to get rid of any codes that where popping up during my KOER, and KOEO. Replacing several parts that were bad has significantly helped the performance of my truck but i am still stuck with a bad miss. i have been in a run around with this truck for sometime, and even after having several people taking a look at it we cant figure it out. my problem at the moment is that the truck will run great when you first start it up, and for the first 5 mins. after 5 mins though my truck will start to miss, and backfires/sputters from the exhaust. i have checked and rechecked compression, fire, and fuel pressure, and all is good. i currently have no codes at all, and also my timing is spot on. being that the truck runs great for the first 5 mins and then like clock work after the 5 mins of warming up it runs terrible leads me to think it is something electronic, but i just dont know what. every point of ignition have been replaced, as well as every point of fuel besides the injectors. if someone out there has any idea at all as to what my problem may be PLEASE help. Thank you!
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