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#1
10-25-2013, 12:12 AM
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What does this part do?
We're trying to come up with a conclusion of what was causing my car to have problems going up either steep, or long hills on the highways in VA/W.Va. I was going up hills at a ridiculous 40 mph at the steepest areas, getting buzzed by from normal cars that were easily doing 70-80 mph.
I've been up those hills many times before with no problem until a trip last year. We ruled out bad fuel, which was a possibility last year, but since this happened a second time, we now know it's not bad fuel. Here in Atlanta, it runs just fine, so it's hard for us to figure out what's causing the problem. We adjusted a few things, I replaced a few rubber vac hoses so as far as we know, it's fixed at this point. But I did want to ask, what is the name of this part, and what does it do? Does it fail, or need adjusted/repaired, or replaced? Thanks. 1991 300d, 183k 
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#2
10-25-2013, 12:15 AM
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#4
10-25-2013, 12:21 AM
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#5
10-25-2013, 12:24 AM
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#6
10-25-2013, 09:15 AM
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I'm sure it's emissions related, likely to force more egr gas into the intake...
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#7
10-25-2013, 09:20 AM
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That part is used in conjunction with the EGR valve. It restricts air intake during the time the EGR valve is open. The system is computer controlled. If the computer detects an error in the system it will kill the boost, and you loose power. A boost gauge would tell the story. The waste-gate on the turbo is vacuum operated. Most if not all other turbos are boost pressure operated. Do a search on 602 waste gate. You should find a lot of information on this subject.
You need to get the error codes from the ECM and maybe you will get a clue of what is going on. There are other things that can cause the same problems you have. The over boost protection system for instance. Most people just disable it. A good running 91 300D 2.5T should be able to handle most any driving conditions you would run across. My 91 with 320K+ miles still runs great and uses no oil and will get 33 mpg trips. Paul
__________________
84 500 SEL (307,xxx miles)
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#9
10-25-2013, 04:32 PM
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Remember that EGR is there to lower combustion temp which lowers N0X emissions. Lots of folks have trouble with this concept as they think of the exhaust as being hotter than inlet air, which it is. The temp reduction is a function of the change in charge chemistry when exhaust gas is reintroduced into the chamber. As Diesels are low in most emissions but high in N0X, EGR is very effective on Diesel engines, especially if the EGR gasses are cooled. There - WAY more than you wanted to know. I return you to your regularly scheduled thread..... Dan
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#10
10-27-2013, 09:02 PM
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Fuel filters, etc., are always kept clean; I replace often
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#12
10-27-2013, 09:38 PM
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a brand new filter can be trashed in a single tank of fuel. only way to know for sure the filters are clean is to change them and re-attempt the hill.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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