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post #1 of 4 Old 12-26-2012, 10:35 PM Thread Starter
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Unhappy no boost

Hi

Yet another code(s) for my truck.

I am showing p1247 , p1248 and p603. The 603 doesn't concern me at the moment but the other two are very apparent when driving.

I have checked all the boots and none seem to be leaking.
Any suggestions ? MAP sensor ?
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post #2 of 4 Old 12-27-2012, 09:54 AM
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Could definitely be the MAP sensor. Like I stated on the other forum, hook up a scan tool that will read MAP and see what it is doing. Also, did you unplug the sensor with the key on? (I know I said the same stuff on the other forum, but different people see this forum who may need the same help.)

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post #3 of 4 Old 12-28-2012, 11:26 AM Thread Starter
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no boost **fixed**

Hi

I installed the new MAP sensor last night and today, I can hear the turbo whistle and what difference in performance.

Thanks for the help.
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post #4 of 4 Old 10-17-2013, 07:30 AM
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I've got an '03 7.3, running fine except that the turbo doesn't seem to be doing much at the moment. Codes p1247, p1209, p0603. The p0603 should just be related to messing with the tuning switch. Seems to have decent power at low rpms, then nothing at about 2k. Slight leak from up pipes, but prob not enough to cause what I am experiencing, esp since it started fairly suddenly. In the absence of any other leaks, does that sound like MAP failure? It could still run fine?

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