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93 F150 5.0l running rough

 
Old 11-17-2016, 01:04 PM
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yeah i have put 2 cans in the fuel already and let it run through the system.
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Old 11-17-2016, 01:29 PM
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Injectors are probably clean enough then. An inspection of the spark plugs would show if one cylinder is rich/lean/etc. anyway. If they all look the same then the problem is elsewhere.

There are a lot of sensors and what-not on these engines since they are computer controlled and if one is not working properly it can cause an imbalance in the fuel/air/spark/timing sequence. And they won't all throw a code either. It's aggravating to say the least.
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Old 11-17-2016, 02:23 PM
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Very aggravating it is. Ive went through the entire truck pretty good, and i cant seem to find the issue. Every cylinder has good compression, vacuums good, every piece of the ignition system has been replaced, and just about every sensor has been replaced. im at a complete lost. By no means am I a certified tech, but i do pretty darn good for just being a backyard mechanic.
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Old 11-17-2016, 02:33 PM
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I guess it couldn't hurt to verify base timing? Maybe test the TPS and pull codes for a KOER test?
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Old 11-17-2016, 03:20 PM
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And this is a generic symptom that can have many causes.
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Old 11-18-2016, 12:47 AM
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I know a guy can refurb them himself but i don't do that sort of thing by the millions like these guys, not to mention a couple of mine were just trashed once i got them out and looked at them, they were over 23 years old, i doubt i could of brought them back to life, they were basically stuck open, fuel was awash in the cylinders, hence the smell of fuel and horrible mileage, spark plugs were good because the gas was constantly cleaning them.

Basically injectors will mess the fuel air mixture all to hell and the computer will be constantly trying to adjust, i changed my o2 sensor too because it was old and had to deal with the wonky injectors for far to long, put it this way for around 150 bucks it made the truck feel like it was all together different.

As for whether this is your problem ? I couldn't venture to guess as i'd have to be privy to the ins and outs of your ride and it's quirks, just relaying something that worked for me. Hope you get it solved.


https://www.injectorrx.com/fuel-injector-symptoms/
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Old 11-18-2016, 01:04 PM
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After reading all of yalls post, and sitting down to gather my thoughts about what it could be i realized, and remembered that when i put the new plugs in the old ones did seem to be soaked with fuel, and also the exhaust smelled of fuel so bad it could take your breath away, and burn your eyes. If a 02 sensor was bad like you guys said then it would definitely make sense why the truck is acting this way. But the only thing is, wouldnt a bad O2 sensor for sure pull a code because i dont have any codes, and no check engine light. also if there was to much fuel wouldn't it gag the motor and make it fall flat on its face or could it cause the misfire symptoms like im having as well.
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Old 11-18-2016, 01:05 PM
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BTW thank you all for the good feedback, and info!
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Old 11-18-2016, 01:21 PM
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If the fuel smell and spark plug soaking is that bad then you may very well have a sticking injector.

I think there's a fail-safe level so that a bad o2 sensor might cause a rich condition, but shouldn't trigger a flooding condition. Could be wrong though. Still, the o2 sensor may indeed be bad, but it may not be the direct cause of the problem. Yeah, you'd expect a code, but that's only in Paradise where all things operate on reason and logic.

Have you done an oil change recently? Did the oil have a strong gas smell also? Extra fuel will wash the cylinder walls (removing lubricating oil) and, if it's a sufficient quantity, can displace enough air in the cylinder to prevent full piston movement. That's a really bad thing.
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Old 11-18-2016, 02:33 PM
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I thought it may be a sticky injector at first but all my plugs had fuel on them and i really dont think every injector is sticking. I havnt had a chance to change the oil yet, i just bought the truck about 2 weeks ago, and i was trying to get the miss to straighten out first. The oil does have a gas like smell to i though when i smell it on the stick.
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