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#1
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92 300d flaper in intake?
Hey all , kind new to this so hears the question , 1992 300d 2.5 turbo , what is the flapper valve in the intake for ? it seems to be closing just off idle and making the engine miss & smoke , if I disconect it at the vacume line on the fender alls well . thanks for any input in advance , craig
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#2
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The flapper is there for more precise control over the mixture of EGR gas to fresh air. The computer closes off the flapper and opens the EGR if it needs more EGR gas. If you still use the stock wastegate system, you'll need to have both the EGR and the flapper valve functional for the computer to allow boost.
It shouldn't affect idle under normal conditions. If it is, it may be sticking closed or the lines to the EGR and flapper valve may have been switched. If you're getting boost, everything's probably OK.
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Dale http://i52.photobucket.com/albums/g1...MG_2277sig.jpg 1990 300D 2.5 Turbo -155k 2000 E430 - 103k 2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k 2014 VW Passat TDI SE - 7k Bro's Diesel 2006 E320 CDI - 128k Pop's Benz Pre-glow - A moment of silence in honor of Rudolph Diesel |
#3
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Eliminate the EGR and Flapper (+a bunch of other Crap)
Member GSXR has been the pathfinder on this worthy project.
It will allow you to free your engine from the Tyranny of the EDS (Computer) whose sole function is to "Deny You Boost". http://www.peachparts.com/shopforum/showthread.php?t=212097
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'84 300SD sold 124.128 |
#4
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falper in 92 300d
Hey thanks , this is all good stuff , I have been a marine diesel tech for 20 years and this 300d is shurely different, why do they want to restrict fresh air into any diesel?? this will surely mess things up , the air flapper on mine seems to choke off 3/4 to 7/8 of air flow coming off idle from about 900 to 1800 rpm intermitintly
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#5
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Is the flap sticking? It is a spring-loaded air-flow metering device, with an intake air temperature sensor, that's all. A passive device. The minimal amount of pressure delta across a properly-functioning airflow meter should not affect the engine's performance.
If it's bad, and you don't have the time to switch to a pressure-operated wastegate, there certainly are used ones around.
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Gone to the dark side - Jeff |
#6
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flaper
No , this is a vacume active sol , the vac line goes to a electric valve looking thing on the pass side fender. it dosent look like its sticking , the vacume pulls the flaper closed, there is a multi wire plug on top of the valve on the fender, I think the computer controls the valve, this set up does not have a waste gate , are they trying to limit boost by dumping exhaust gas back into the intake track? if so its a bad idea , makes for a very foul intake system.
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#7
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Okay sorry, I thought that you were talking about the airflow sensor mounted under the air filter assembly.
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Gone to the dark side - Jeff |
#8
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Quote:
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93 300D 2.5 Turbo, Black/Palomino 273K 09 E350 Black/Black 41K |
#9
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+2. I did the conversion; well worth the minimal effort and cost.
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1992 300D 2.5T 1980 Euro 300D (sadly, sold) 1998 Jetta TDI, 132K "Rudy" 1974 Triumph TR6 1999 Saab 9-5 wagon (wife's) |
#10
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if you plan to keep the car follow GSXRs posting on changing to a pressure operated wastegate actuator and save yourself a lot of time/money.Your car has a vacuum operated wastegate that is controlled by a couple of electrically operated vacuum valves that are controlled by the EDS (computer module) and it will prevent the turbo from making boost unless all that junk long the inside of the passenger side fender is operating properly,and just one of those vacuum transducers will cost more than the conversion. Don
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Red Green "This is only temporary,Unless it works!" 97 E300D 157000 miles 87 300TD ?141k? miles |
#11
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Do Not ever Look in your Intake!
emarine01,
The Damn Flapper is functioning correctly.It is to restrict fresh air and increase EGR Smut intake at idle. The combination of the EGR Smut and the Valve Cover (Crankcase Pressure Relief) Oily Vapors inserted Upstream of the Turbocharger Intake contaminate the Intake Tract (Can clog Pressure sensors for Overboost,Etc.). If you unscrew one of the Devices (or a Plug) on the driver's side of the Intake Runner,You will be appalled at the crap you see. This shot is of gsxr's intake valve port.
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'84 300SD sold 124.128 |
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