loss of boost - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 05-10-2006, 02:14 AM Thread Starter
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loss of boost

i used to getting close to 30 psi of boost on the 140hp setting that i have only had installed since last august. now i am only getting about 20 psi max. what could be the problem? i dont have any codes. everything runs fine. boost leak? ebpv? wastegate? any info would be much appreciated.:HappyMugs

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post #2 of 7 (permalink) Old 05-10-2006, 04:06 AM
 
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#1 check air filter and intake for a restriction. #2 check intrcooler boots. look for an exhaust leak on the up pipes and y . #3 make sure the map hose is not plugged or pinched. #4 check the waste gate lever and actuator. #5 check your fuel pressure at 2500-3000 rpm under a load [climbing a hill or with the vehicle fully loaded]. #6 plugged green wastegate hose or port in the charge air intake to the turbo. a wastegated turbo is designed to reach maximum boost sooner than a conventional turbo,but overboosting will cause damage to the turbo.:Thumbup:
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post #3 of 7 (permalink) Old 05-10-2006, 06:46 AM
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Check to make sure that the Boost Relief Valve isn't stuck open.

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post #4 of 7 (permalink) Old 05-10-2006, 08:52 AM
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check the oil level. the fuel system runs off of oil pressure, if you are low, it will run rough, tough to start/stay running and result in a loss of boost.
i know it sounds stupid but it's worth a look.
just my 2 cents.
doesn't cost anything either.

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post #5 of 7 (permalink) Old 05-10-2006, 12:11 PM
 
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Quote:
Originally Posted by ITPDiesel
Check to make sure that the Boost Relief Valve isn't stuck open.
Even with a stuck open relief valve he should be able to hit 25 lbs of boost. That was done part of the development testing we did on the valves.


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post #6 of 7 (permalink) Old 05-10-2006, 12:16 PM
 
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Quote:
Originally Posted by diesel71
#1 check air filter and intake for a restriction.
#2 check intrcooler boots. look for an exhaust leak on the up pipes and y .
#3 make sure the map hose is not plugged or pinched.
#4 check the waste gate lever and actuator.
#5 check your fuel pressure at 2500-3000 rpm under a load [climbing a hill or with the vehicle fully loaded].
#6 plugged green wastegate hose or port in the charge air intake to the turbo. a wastegated turbo is designed to reach maximum boost sooner than a conventional turbo,but overboosting will cause damage to the turbo.:Thumbup:
Great approach, I would also add:
#7 Check the Gauge (making sure it is not defective), and the line to the gauge for kinks or debris.


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post #7 of 7 (permalink) Old 05-10-2006, 08:37 PM
 
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Quote:
Originally Posted by dfuser
Great approach, I would also add:
#7 Check the Gauge (making sure it is not defectove), and the line to the gauge for kinks or debris.
#7 :agreed: :agreed:
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