90 pete with 3406 no boost? - Diesel Forum

JOSHUA LEE · 10-14-2009, 02:16 AM

truck ran ok before now low boost? what can cause this? I just started work at a company with this issue.. Its a no elec. motor

nevrenufhp · 10-14-2009, 07:51 PM

First thing to me sounds like the air/fuel diaphram. Pull the line from the intake, and see if that diaphram holds air.

**Believer45** · 10-14-2009, 09:02 PM

I would check all the intake boots as well, between turbo and intercooler and intercooler to intake manifold. They can tear, or one end can just pop off.

Dave / Believer45

Joel c · 10-15-2009, 12:17 PM

I found with my inner cooler low boost problem it was the innercooler
tube to header joints leaking. These guy's had the best price I could find for a new one .autoparts | RadiatorsRUs | Radiators | Condensers | Heavy Duty Truck Radiators | Charge Air Coolers They told me a innercooler should only last about a million therm tem changes before the joint,s fail.

JOSHUA LEE · 10-20-2009, 11:24 PM

How do I check the air fuel diapram? Im new to this guys... Mechanic by means of a life around race cars so I can adapt but need the right path, lol