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Old 05-31-2010, 03:04 PM
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E99 boost questions

so the last couple times ive pulled codes on my truck ive gotten a P1247 low boost, and a P1249 wastgate code. i took it to a diesel tech to see whats goin on. he said it was nothing to worry about. so i installed a boost guage the other day and only getting 15psi. then 16psi with the little red line unplugged from wastgate.

i know the early 99s have different turbos etc. but shouldnt i be making at least 18psi?

i heard the EBPV can cause a low boost condition like this so i cleaned the tube and noticed the little diaphram in the sensor was gone. is this the issue? also notice it takes a while to warm up enough to have power. im only getting 13mpg lately too. used to get 17 whats going on?
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Old 05-31-2010, 03:07 PM
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stock tuning i was getting about 18 psi of boost, with my DP tuner i get 28 psi on 120 race.
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Old 05-31-2010, 03:35 PM
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ok so there is a definate issue with mine only getting 15psi

any ideas?
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Old 05-31-2010, 03:59 PM
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i have gotten up to 25 ibs of boost and thrown a overboost code.
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Old 05-31-2010, 04:20 PM
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yea but your running a resistor that will give more fuel and increase boost im talkin stock
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Old 05-31-2010, 04:41 PM
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stock i hit 21 max.
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Old 05-31-2010, 07:49 PM
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ok well i just checked all the IC boots and tightened em all down. throughin a 5.6k resistor and unplugged the wastegate, just to see how much boost i can make
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Old 06-01-2010, 01:19 PM
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Check your up pipes for soot, this would indicate exhaust leaks which will do what your truck is doing lately. Also, the EBPV can get stuck. Mine did and I just deleted the damn thing.
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Old 06-01-2010, 08:00 PM
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no up pipe leaks that i could see. how exactly did you delete the EBPV? im leaning more towards that because it takes forever to warm up even at 60*

i hit 22psi with the 5.6k resistor and the wastegate unplugged, so maybe it was just the IC boots were loose
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Old 06-01-2010, 08:30 PM
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I hit 30-32 psi w/ a fooler on a tune.

Stock w/ just fooler I can hit 23 if I try
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