early 99 losing boost - any ideas? - Ford Powerstroke Diesel Forum
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Old 01-17-2014, 06:58 AM
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early 99 losing boost - any ideas?

I have a boost gauge in the truck - I have noticed that it reads lower then it use to when I first got the truck. At 1200 rpm it is now reading 1lb of boost instead of what I think I remember it use to read 3 to 5 lbs. This is not on the chip. Truck also takes a lot longer to kick in and move for passing then it use to.

So my question is what do I look at - Turbo broken fins, inner cooler, system tubing leaks or all the above?

Truck / motor now has 188,000 miles on it. I have also been wondering when injector service/replacement should be done?

Thanks for your help. Daryl
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Old 01-17-2014, 07:35 AM
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At idle means nothing.
You could have exhaust leaks pre turbo, which will be sooty areas by the up pipes.
Intake system could have leaks - pressurize manually and test.
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Old 01-17-2014, 07:36 AM
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check intercooler piping boots for cracks(6 boots total) and up-pipes/manifolds. boost should be alot higher, my 02 at full throttle is up in the 20s according to my torque app i believe boost should be in the high teens to 20s for stock with the pedal fully pressed.
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Old 01-17-2014, 07:36 PM
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Thanks I will check this out - I thought I remembered 20 or so when I first got it - when passing with ship in stock position.
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Old 01-18-2014, 06:09 AM
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completely stock truck max boost is about 16 psi.

you most likely have a boost leak, you can build a boost leak detector or buy one from dieselsite.

on a side note my ipr was faulty and when i replaced it i gained 3 psi of boost. it wasnt reading correct oil pressure.
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