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  #1  
Old 11-04-2008, 11:47 AM
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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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Old 11-04-2008, 01:03 PM
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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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  #3  
Old 11-05-2008, 04:48 AM
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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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Old 11-05-2008, 12:19 PM
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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 when the flapper does not move we run great , when it pulls vac to the flapper sol we chug & smoke untill the rpm goes up past 2000 then runs fine, was thinking of just dropping flaper vac line & driving with unrestricted air flow?
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Old 11-05-2008, 01:26 PM
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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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Old 11-05-2008, 03:02 PM
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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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Old 11-05-2008, 03:38 PM
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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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Old 11-05-2008, 04:00 PM
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Quote:
Originally Posted by compress ignite View Post
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
+1
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Old 11-05-2008, 04:16 PM
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Quote:
Originally Posted by amg280 View Post
+1
+2. I did the conversion; well worth the minimal effort and cost.
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Old 11-05-2008, 09:06 PM
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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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  #11  
Old 11-06-2008, 12:19 AM
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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.
Attached Thumbnails
92 300d flaper in intake?-screenhunter_02-nov.-06-00.23.jpg  

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