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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
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.
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
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?
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.
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
90 w250 4" to 5" dual stacks ,64/71/14, pump mods, 727, 1400stall tc, full 1/2 inch fuel system dual filters 100gph electric pump to the ip, full 3" crossover tube
5x14's waiting to be installed
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