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post #1 of 7 Old 01-30-2010, 01:25 PM Thread Starter
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trouble code 1247

Low boost pressure:
what causes this code?
I did unplug and plug the waste gate vacuume line? It weird i still head the pop or what sounds like a operating waste gate? I dont notice anything screwed up? where would i look to remedy this?
thx

2008 6.4 f250 lariat 4wd
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post #2 of 7 Old 01-30-2010, 01:36 PM
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MAP hose, sensor, EBP sys, intake leaks, turbo. Do you have a boost gauge? If so whats it reading?
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post #3 of 7 Old 01-30-2010, 01:59 PM Thread Starter
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I do not have a gauge. Let me start by saying the brass fitting that the map hose goes to thats on the aluminum preturbo pipe is loose. I can spin it around. It wont fall out but what ever glue was there is gone or it lost its press fitting tightness.
The ebp system, you speak of, I unhooked the plug for the valve to operate.
Were you referring to the sensor if front of the motor?(with the tube to the exhaust manifold?) can this effect it?
heres a dumb one, what exactly is the intake?

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post #4 of 7 Old 01-30-2010, 10:10 PM
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Im not an expert but Im in the process of fighting low boost numbers to so Ill tell you all I can. I consider the intake to be anything from the compressor wheel to the engine, the six rubber boots on the intercooler pipes get holes or loose clamps and lose alot of boost. If that brass fitting is that loose then all your boost could be blowing out there, it should be stationary. The EBP sensor is the one on the front and I understand that the tube gets clogged up and could cause low boost.
Hopefully somebody will reply if any of this is incorrect.
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post #5 of 7 Old 01-31-2010, 04:19 AM Thread Starter
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thx the ebp sensor, how could that cause low boost? I suppose if clogged would tell the pcm to do wrong things with the ebpv. I have that unplugged? The low boost could be a bad sensor too i guess?

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post #6 of 7 Old 01-31-2010, 10:42 AM
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Yeah when it gets clogged it gives a bad reading. So you have the sensor behind the belt unplugged right?
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post #7 of 7 Old 01-31-2010, 10:49 AM Thread Starter
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i have the valve by the turbo unplugged. The ebp sensor somehow also controld fueling, (I think?) I was undure if unplugging that would do anything abd?

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