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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

       
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Old 06-01-2005, 11:51 PM   #1 (permalink)
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What the Frick!! why is my pm temp so hot all the time

hey all again, just to recap, I know I should put it in my signature, but anyway, 1992 7.3, with ats turbo, and 3" exhaust, and a 5 speed and 4.11 gears, I live in colorado so anywhere i go there are hills, now for the scenario

take off from a light, get on the truck pretty hard, black smoke at first(normal I assume) but I can only achieve 8 psi no matter how hard i try, and this doesn't happen till like 2500 rpm or more, in fact at 2000 rpm, I get no boost, even when cruising and I jump on the gas at 2000 I get no boost, all that happens is more black smoke and my pm shoots through the roof, unloaded in town, I can hit 1000-1100 if I want, and I am not even really going all that fast, I feel as if the turbo isn't really working all that well

scenario 2) total maybe 5000 extra #'s slight hill maybe 5% or so, and in order to keep a steady speed of 40 or 65 or whatever you obviously need to give a little more gas, now once again the pm shoots up there in about no time and I have to back of the gas, thus slowing me down and thus defeating the purpose of a turbo diesel

to sum it up, pm are really high I think, maybe this is normal, but it seems that is the last concern of other people, and low boost I think again, not sure this is the only idi I have ever been in, maybe this is normal, if so, i am very un satisfied with the ole idi setup

is all the black smoke extra fuel, I mean is the pump turned up too much or something or what is the deal?
tanks in advance
Dustin
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Old 06-01-2005, 11:57 PM   #2 (permalink)
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Re: What the Frick!! why is my pm temp so hot all the time

Black smoke is unburned fuel. You should have a little bit when you lay down hard on it...

Yeah, Ive always heard the complaints of not getting good enough boost soon enough...

If you tow often, i really dont know what to do. If not, Id turn it up to 12 psi max.

someone else will be of better help
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Old 06-02-2005, 10:59 AM   #3 (permalink)
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Re: What the Frick!! why is my pm temp so hot all the time

Sounds like your turbo's wastegate is stuck open, or possibly a bad turbo.

Your problem isn't the fuel, but that the turbo isn't boosting, so that you are in effect overfueling since you don't have the extra air.
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Old 06-02-2005, 01:28 PM   #4 (permalink)
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Re: What the Frick!! why is my pm temp so hot all the time

How long has it been since you changed or cleaned the air filter?
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Old 06-02-2005, 02:51 PM   #5 (permalink)
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Re: What the Frick!! why is my pm temp so hot all the time

How do you know your boost gauge is accurate? Maybe the line is cracked.
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