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Old 08-26-2011, 10:05 PM   #1 (permalink)
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no boost any suggestions 5.9

hello just bought a 1991 250 4x4 5.9 getting no boost on gauge truck has a banks exaust and intercooler. holset hic turbo and about 200k mi tested gague it works fine tested for leaks in intercooler none. i can see the turbo spinning when i remove intake hose. i cant see a dump gate so im assuming there is none? not sure what else to do im no diesel mechanic just looking for some suggestions thanks for any help
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Old 08-26-2011, 11:08 PM   #2 (permalink)
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Check all your I/C boots real good, make sure there arent any leaks in the line to the gauge also.

Have you tested the whole system?

Did you get boost before or did you just recently install the gauge?

What pump mods have been done?

Also, theres no waste gate on the h1c's on our trucks.
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Old 08-27-2011, 03:44 PM   #3 (permalink)
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diesel freak thanks for he help. pressurized the line from turbo to intake no visible leaks. not sure about the mods on the pump just bought the truck. no leak in gauge line.
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Old 08-27-2011, 05:32 PM   #4 (permalink)
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What I'v done is seal the intake at the turbo and at the intake like you did, at the intake boot at the intake heater clamp a 2" pvc cap with a tire valve stem in it into the boot.
Air it up to 15-20psi or so and let it set for a few minutes and check to see if it held the pressure. Is that how you did it? Also spray some soapy water on all the boots and fittings and watch for bubbles.

Does your truck smoke at all?
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Old 08-28-2011, 02:17 PM   #5 (permalink)
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yup sounds like same thing i did no leaks. smokes a little kinda white smoke.
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Old 08-28-2011, 06:37 PM   #6 (permalink)
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is there any way the turbo can just not be pushing enough air? i took off the intake hose while it was running and put my hand over it at idle not that much pressure but when i revved it it blew my hand off. is it possible just not enough pressure to read on boost gauge? thanks
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Old 08-28-2011, 09:53 PM   #7 (permalink)
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Yea, but I'd atleast think you'd see a little boost. My pump is stock fueling and my h1c turbo would barely make 5psi at best sometimes. I have a vgt and all it makes is 12psi without the pump being turned up.

If your truck is an auto and the pump is all at stock settings I'd say thats part of the problem. Is it an auto?
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Old 08-28-2011, 09:58 PM   #8 (permalink)
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Also, if you would, fill out your signature so we can keep track of what's already been done to the truck
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'92 w350 5spd 3.54- VGT, 5x12's, 366 gov, M&H timing spacer, Ground stock pin, Snow stg 2, BHAF, Low pressure piston pump, gauges, 4" TBE, VE adjustments, AirLift Ultimate 5000's, otherwise stock
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Old 08-29-2011, 09:10 PM   #9 (permalink)
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yup auto 4wd stock tires and gears
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Old 08-29-2011, 09:16 PM   #10 (permalink)
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ha just figured out that signature thanks
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1991 5.9 turbo diesel auto 4x4 long bed banks 3' exaust and banks intercooler k&n filter stock rims and tires
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Old 08-29-2011, 10:29 PM   #11 (permalink)
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No problem. I'd say if theres no smoke under acceleration, you might try turning your smoke screw in a little, maybe that will let it get a little more fuel at low rpm and help it spool.

Just turn it a little at a time and try it out. Just remember how many turns you give it. If it gets to where theres a lot of black smoke and still no spool up, just turn it out to where it was so you arent just wasting fuel.

This will be a fairly easy and cheap test, give it a try and see if it helps and report back with your results. There should be plenty of threads on how to mess with the smoke screw.

Also, is your air filter clean?
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Old 08-30-2011, 01:25 AM   #12 (permalink)
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how does the truck feel power wise???
sounds like your gauge is facked up
if your turbo was doing nothing you would be throwing smoke for sure
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