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Old 07-16-2010, 01:28 PM
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Low MAP and Low EBP = Low power

Hi from way down under!
I've got a pretty much stock 2002 F250 4x4 Crew 140K(brazilian built right hand drive) which has had a low boost/low ebp/low power problem since I got it. MAP sensor showing boost under load is of about 4-5 psi half throttle and max of about 12 at wot(MAP 26), EBP also max of 36, but no black smoke. Only getting the one code P1247 after each run in truck, no CEL. Tested for boost leaks, none found. I have replaced - turbo with aftermaket one(bigger wheel, ats housing, stock turbine, Turbomaster wastegate controller), up pipes with IHI bellowed ones, MAP and EBP sensors, filters and oil. EBP tube is clear, fuel pressure at the bowl is ok 61 idle 57 wot, icp and ipr are within range.
It's just pretty gutless/no pull. All ideas appreciated

Last edited by F250NZ; 07-16-2010 at 03:20 PM. Reason: correction
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Old 07-16-2010, 04:45 PM
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Quote:
Originally Posted by F250NZ View Post
Hi from way down under!
I've got a pretty much stock 2002 F250 4x4 Crew 140K(brazilian built right hand drive) which has had a low boost/low ebp/low power problem since I got it. MAP sensor showing boost under load is of about 4-5 psi half throttle and max of about 12 at wot(MAP 26), EBP also max of 36, but no black smoke. Only getting the one code P1247 after each run in truck, no CEL. Tested for boost leaks, none found. I have replaced - turbo with aftermaket one(bigger wheel, ats housing, stock turbine, Turbomaster wastegate controller), up pipes with IHI bellowed ones, MAP and EBP sensors, filters and oil. EBP tube is clear, fuel pressure at the bowl is ok 61 idle 57 wot, icp and ipr are within range.
It's just pretty gutless/no pull. All ideas appreciated
Did you install the Turbomaster yourself? Is the adjusting nut cranked down all the way? Any chance the wastegate is stuck open?
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Old 07-16-2010, 04:50 PM
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no misses?
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Old 07-16-2010, 06:48 PM
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Thanks for the quick replys,

I installed the Turbomaster myself and running with it wound down to about 1in. I thought it might be that too, so I replaced the spring with a piece of tube and wound it up tight to make sure it wouldn't open at all, but made no difference to boost/performance.

No misses, idles and runs smooth.
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Old 07-17-2010, 11:11 AM
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Replaced the cps to see if it improved anything, seems to be running slightly better/smoother but numbers are the same.
What is the best/easiest way to test if it's the low boost causing lack of fuel - or the opposite way round - the lack of fuel causing low boost?
Thanks again
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