loss of paower on incline, runs as if we cold, missing, black smoke - Ford Powerstroke Diesel Forum
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Old 08-16-2010, 11:09 AM
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loss of paower on incline, runs as if we cold, missing, black smoke

Hello Everyone,

My buddy borrowed my truck to tow a Suzuki Samurai (small jeep) up to Big Bear and on the flats it towed GREAT, however once he got to an incline, he would loose power and it would run as if it were cold (jerky, miss firing, black smoke). He would then pull over and and let it idle for a few minutes (until the engine light turned off) and then start on his way. He would power through the gears like the truck should and then after a couple minutes it would miss again and the engine light would come back on....

I have not pulled the codes yet but I am curious what you guys think. It is a stock truck with high miles ($273k). I have been towing my 8klbs boat with it with out problems. It only acts up on an incline.

I did run it a bit low on fuel the other day and it run like crap. I called the dealer and he said to fill the tank up and let it run for 20mins, so I did and the truck ran great. Perhaps their is a crack in the fuel pump/pickup inside the tank???

I am trying to sell this truck and it has been running great until this!

Please help.
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Old 08-16-2010, 08:32 PM
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Im going to say it is more of a hpo issue but I could be wrong
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Old 08-17-2010, 09:03 AM
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So I pulled codes last night and I did not hace a chance to write them down but they said, "Low or No Boost" & "Boost above/below desired level" & another no boost code.

Why would it not boost on an incline? I have been driving it around town last night and today and the turbo spools up, waste gate is functioning and runs STRONG but not on an incline... puzzled.

Please Help.
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Old 08-17-2010, 07:56 PM
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Start at the basics check for boost leaks first
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Old 08-18-2010, 10:09 AM
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FIXED IT.

When I removed my boost gauge I used a plastic barb fitting to connect the lines and it melted and was restricting flow.

I have since replaced it with a brass fitting and now it appears to work great. My guess is under a heavy load, the added prolong boost, was just too much.

So to double check, I towed my boat up the Cajon pass and no issues.

Thanks for the help.
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Old 08-18-2010, 10:10 AM
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Oh yeah, and the K&N air filter (came with truck) was filthy (which is now in the trash).
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Old 08-18-2010, 04:20 PM
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Yep k&n is known to ruin these trucks id recommend the diy 6637
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