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Old April 10th, 2013, 01:22 PM
2003 Superduty Bundy's Avatar
2003 Superduty Bundy 2003 Superduty Bundy is offline

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Unhappy 2003 6.0L power lose?

Over the last month or two during cold start up my truck doesn't have any throttle response until after it warms up and then the power just doesn't seem to be what it should. On hard acceleration it just lags and I get black smoke! once it warms up seems to get better but no balls if you know what I mean. I use a Superchips flash pack and recently got the following codes: (P0263), (P0603) & (P1000). Any insight would be appreciated!!
Old April 10th, 2013, 02:25 PM
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glc glc is offline

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P1000 simply means that not all required sensors have achieved readiness since the last memory clear.

You have injector issues. Not uncommon on a 6.uhoh. I'd recommend you detune it and put it back to stock for now, you may have a ECM issue.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
Old April 29th, 2013, 06:25 PM
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ASwaff400 ASwaff400 is offline

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one of the worse things you can do to your injectors in your 6L is hop in and romp on it when its cold. i religiously let my truck warm up before i get in and drive it first thing in the morning. i let the EOT get to 100 degrees before i put it in drive(takes roughly 5 minutes). when i leave. what has your oil change schedule been? you should run 5w-40 full synthetic along with some rev-x

ive been filling my head with as much 6.0 info as i can ever since i started shopping for one...


'95 F150 XLT, reg cab long bed, swapped 351w,
4.56 gears, 4-link SAS, 14" coil overs.

SAS Thread!!!

'04 F250 Lariat, crew cab short bed 4x4 6.0L PSD, 3.73 gears, straight piped,
sinister coolant filter, welded egr, CAT EC-1 coolant, blue spring.
60 gallon fuel tank/tool box, SCT X4 w/IDP custom tunes, SOON TO BE STUDDED!!

a bunch of boats

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