Misfiring Issues! - Ford Powerstroke Diesel Forum
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Old 07-16-2013, 04:05 PM
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Misfiring Issues!

A puzzle... Driving my truck (2004 f350) home one day and it began to misfire when accelerating. It got worse until it was shaking the whole truck. Initially I thought it might be bad fuel or plugged fuel filter. Changed out the filter but still doing it. The next to try was the cam sensor... changed two of those (thought the first was a lemon)... still no fix. It has been in the shop for over a month and can't find the issue. We have even swapped out the turbo. Computer is not picking anything up. Fuel pressure is good. Bi-passed the catalytic converter... still nothing. I just replaced all the injectors in the fall and they are reading at 100%... It seems to happen once it warms up a bit and then when you step on the pedal to accelerate. Any ideas!!!
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Old 07-16-2013, 05:00 PM
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It sounds similar to what my truck is doing. Could air bubbles somehow be getting into fuel system?
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Old 07-16-2013, 08:28 PM
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I was wondering the same about air... but the fuel pressure seems to be steady. Even when the truck is doing it. Would air affect the fuel pressure?
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Old 07-16-2013, 08:29 PM
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I was also wondering about air getting into the system, but the fuel pressure seems to remain steady even when the truck is doing it.
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Old 07-17-2013, 04:14 AM
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Quote:
Originally Posted by theduke_247 View Post
Would air affect the fuel pressure?
Not necessarily; the air could be compressed to the fuel pressure, and not be noticed by the pressure sensor.
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Old 07-17-2013, 03:20 PM
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Could it be a faulty injector? It started happening shortly after the new injectors were installed. It could be happening so quick that the sensors are not picking it up.
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Old 07-17-2013, 05:27 PM
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I talked to the garage today about my truck. They already checked for air getting into the system and are pretty sure that is not it. Misfiring might be the wrong description. What it does is 'stagger' under acceleration. Sometimes it will do it once so you hardly notice it, other times it will do it again and again until you back right off. The whole truck will shake... and then it will smooth out. Sometimes you can drive it for 20 or 30 minutes and it won't miss a beat. The injector modulator seems to be good.. they have changed the peddle... pump seems to be working great. My new injectors are all Ford injectors... could one (or all) be misfiring and it happens so fast the diagnostic equipment isn't picking it up?
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Old 07-19-2013, 12:01 PM
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How about the filters in the fuel tank? My 2001 quit runny on the road a freind said t blow back thru the fuel line (low preasure) thru the tank,, work for me
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Old 07-26-2013, 08:47 PM
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Quote:
Originally Posted by dirtracer 1200 View Post
How about the filters in the fuel tank? My 2001 quit runny on the road a freind said t blow back thru the fuel line (low preasure) thru the tank,, work for me
I don't think that is it either. Fuel pressure is good. Going to try replacing the new injectors on Monday... someone said they had a similar problem and it had to do with a tiny bolt that holds the magnets to the injectors that came lose. The strange thing is that I had all eight injectors replaced early spring with new Ford injectors and the injectors are not showing up on the diagnostics as a problem. So if it is an injector problem - which one is it?... We have tried everything else... and the problem only showed up after I had the injectors done! Could it be an injector problem and still not show up in the diagnostics? The other issue is that it is an expensive fix (especially because they were just done) and even if that fixes the problem... Ford probably won't warranty all eight injectors!
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