engine loses power and missing - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 04-18-2011, 09:04 AM Thread Starter
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engine loses power and missing

Ok guys i'll give you the rundown of whats going on. I have a 99 f350 1st gen, 2wd with 4inch exhaust, chip, gauges and intake.

The issue im having is as follows. The truck would startup but was running rough and was lacking serious power. I was told by strictly diesel that my fuel pump was bad. I changed the fuel pump and fuel filter. This fixed nothing. I then changed the CPS. This fixed nothing. I removed both valve covers and found 1 injector was unplugged on each bank. I plugged both injectors back in and buttoned everything back up. The truck now idles a lot better and runs better but heres the problem. As soon as it gets to normal operating temps the problem returns. It feels like its missing on several cylinders and isnt getting enough fuel. I have used a infared thermo to test cylinder temps and theres at least 2 cylinders that are a lot cooler than the rest. My chip isnt reading any DTC's or codes at all. I had a diesel tech come out to look at it and when he threw his Tester on the truck to read ipr's and hpop pressure he said it all looked good. He feels that I need to change the injector o-rings, glow plugs and under the valve cover harness. I don't wanna just keep throwing money and parts at the truck if I havent pin pointed exactly what the problem is. Any and all help would be appreciated. I'm at my wits end and I need my truck for work.

1999 F350 ext cab LB
Gauges( boost,pyro, trans)
DIY intake
MBRP 4in turbo back exhaust
Superchips flashpaq
35in baja TA's and leveling kit
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post #2 of 4 Old 04-19-2011, 09:44 AM
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i am having the same issue on a 08 6.4, miss fire on number 4, i have replaced the injector, i had two broken roker arm, i replaced them, new filters and glow plug. idels a little ruff but when it gets to operating temp and idels down all here is clattering
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post #3 of 4 Old 04-19-2011, 07:46 PM
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Did you look closely at the plug on the valve cover harness? If they are fried/burnt/beat up it can cause similar problems.

Try unpluggin the ICP sensor and see if it runs any smoother.


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post #4 of 4 Old 04-20-2011, 07:09 AM
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change your valve cover gaskets! I had a similar problem on my 99 several years ago finally change valve cover gaskets and...viola that fixed it!
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