After egr and oil cooler replaced, now i have low boost code - Ford Powerstroke Diesel Forum
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Old 06-16-2014, 07:23 AM
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After egr and oil cooler replaced, now i have low boost code

Hi guys, if anyone could help me I would appreciate it greatly. It all started when the little wrench light started coming on after driving a while. (05 f350) I took it to the dealer and had them read it and of course it was the oil cooler. So I bought all the parts needed to do the job and went to work. I fixed the hpop leak as well.
I was going to replace the egr cooler but when I removed mine someone had sealed up the exhaust inlet and outlet so I called the guys at bullet proof diesel and they said I needed to keep it as there was no way water could get in the exhaust.
Anyway, I got it all together and the truck runs fine other than the check engine light is on. Had it read, low boost, and the boost gauge is flatlined. The ad vents only blow through the defrost now. Could they be linked to the same problem. Any ideas would help greatly.
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Old 06-16-2014, 07:34 AM
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The blowing through the defrost vents is a vacuum leak problem. You have a line off somewhere.
Are you able to build any pressure with the turbo?
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Old 06-16-2014, 07:35 AM
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Check vacuum line into heater control valve. Also check MAP sensor hose to intake manifold. You most likely removed it during the job and it never got hooked back up.
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Old 06-16-2014, 08:09 AM
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Kinnisoj: the gauge will move a little if I really get on it. Maybe 3-5lb. The truck drives fine,has plenty of power. I drive it from south Carolina to Arkansas and back like this with no problems.
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Old 06-16-2014, 08:11 AM
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A2elvis: the vacuum on the intake is connected. I'm not sure where the heater control valve is.
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Old 06-16-2014, 08:14 AM
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If you don't have any major boost leaks that you can hear try this. Start the truck, unplug the vgt solenoid. (the plug should be easy to get to on the turbo) Listen for a change in the pitch of the turbo. Should be like a flip of the switch. Im gonna bet when you unplugged this to do you other work it got damaged. Happens a lot. Those poor wires just get cooked by the turbo. Good news is its easy to fix with a replacement plug.
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Old 06-16-2014, 08:15 AM
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Quote:
Originally Posted by troche289 View Post
A2elvis: the vacuum on the intake is connected. I'm not sure where the heater control valve is.
Keep lookin around it just takes one little hose to be off...(been there and done that)
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Old 06-16-2014, 08:25 AM
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Kinnisoj: I replaced the and it didn't change anything. Could the solenoid get stuck.
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