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Old 11-23-2010, 02:55 PM
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Angry High rpm miss

I have at 05 6.0 that just rolled 200000. I have been running ID custom tunes since i bought it at 190000 miles. Replaced a bad injector at 195, about 2000 miles ago installed a new fuel pressure regulator, new banjo bolts, and a new ficm. new motorcraft oil and fuel filter to try and fix the problem and nothing. i run royal purple 15-40, plus two bottles of rev-x. now to the problem. i have noticed a high rpm miss with a loss of power thats getting worse. It used to have a light haze at wot with xtreme street, now it has a whiteish haze and pops and misses and looses power. Im just trying to figure out what the problem might be. im getting no codes at all. do you think i have low fuel pressure? getting a gauge with my next pay check, or maybe injector/s or possibly the hpop. any help would be great thanks. it runs good up to about 2500 rmp and misses, but only misses under heavy throttle, under constant high rmp and sustaining speed there is no problem if i cant figure this out or it too expensive im getting rid of the truck
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Old 11-23-2010, 09:53 PM
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My guess would be bad injectors with that many miles on the truck. At high rpm, those injectors are firing mulitple times as the piston is in the power stroke. Anything mechanical in the injectors that would slow the "recovery" phase of the plunger would allow it to fire at slow speed, but start to stumble at high speeds. I would also associate that with possible low electrical current to the injectors also.

Do you have a scanner? Might need some detailed info from a scanner and possibly cut injectors one at a time under load to find out which cylinder(s) it might be and work from there.
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Old 11-24-2010, 12:54 PM
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I am planning to take it in to a good shop close by, just dont have the cash at the moment. all I have is a insight cts, want a AE but dont have the cash for that either
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Old 12-13-2010, 03:13 PM
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So, havent had a chance to take it in yts, but while reading a article, im now wondering if i have a bad piston, piston rings, or a damaged cylinder wall, i get puffs of smoke from around my dipstick at a constant rate when the truck is at idle like blowby from a bad sealing piston, anyone have ideas on that, im going to have a compression check done when i can get an appointment, if theres a bad one, this truck is gone
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Old 12-13-2010, 04:36 PM
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Well, white smoke is coolant.......
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