Where exactly is the EGR valve on my car? I have a 1983 300D-T and I think it's the smallish unit in front of the air cleaner housing. It's the circular thing that looks like it's turned on it's side and it's mounted to the intake with a metal flex tube that runs to the exhaust manifold. Am I right? It has one short vacuum tube that runs to something near by that's also in the front of the car. I've been reading a lot about this valve on here and am considering plugging up it's vacuum inlet. Thanks for the info

Alex

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1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside

Sounds like you found it.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold

Yep....you've identified the EGR. I disabled mine on my 300TD and it made some difference in pickup. I don't need to on my 300D-T because it has plenty of pep. Good luck!

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DAILY DRIVERS:
'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

SOLD:
'82 240D 229k (Matt's - Converted-300DT w/ 4 speed

Also, am I right in assuming that the vacuum applied to the valve opens it up and allows the exhaust gas into the intake?

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1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside

I have a '85 300CD. While poking around under the hood, I noticed that the rubber tube connecting the vacuum line to the EGR ws cracked completely through and would not be able to hold vacuum. I replaced the tube.

Seems I now get worse gas milage. Is it possible that by "enabling" the EGR I lost effeciency? Will it hurt the car to just disconnect the vacuum hose to the EGR? Motor operation has not changed that I can tell other than decreased milage.

Thanks,

Nic

Nic,

the EGR Valve won't come to play at idle and at full throttle(No vacuum supply to it). Also, it doesn't work until the car is warm up(80+ C). It's main function is to cool down the combustion chamber and therefore to reduce the harmful particles(nitrogenoxide??) release to our enviroment. I think it'll give you better fuel economy if it is not working. Of course there is some legal issue involve but I'm not going to debate on that. I think if I can get a better gas mileage, I do less harm to the enviroment....
GM(?) introduced this EGR in the 70's they must have their supportive data to prove that. I don't know whether this is the same theory like the intercooler's. May be that's why we get a better fuel mileage at 60 range.

On my car if I'm doing 80+ I can see the temp runs higher I think that's when(full throttle) the VAC is zero.

do a search at yahoo for "EGR" you'll see a lot about it.

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BJ

09 GL320 Bluetec 65K+
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07 Kawasaki Vulcan 900 5k+ gone
87 300SDL 158k+ gone
91 300D 113k+ gone
83 300SD 220K+ gone
89 300E sold
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I recently disconnected and plugged the vacuum line that goes to the EGR with a screw and I have noticed several improvments. My MPG has gone up a little, there is less dust (not smoke because my car has never smoked) coming out the back, and the turbo seems to have gotten more responsive as it spools up a lot quicker. I think I'm going to keep it permanently disconnected.

Alex

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1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside

thanks for info. I'm going to plug it up and see what happens to fuel economy and temp.

Nic

all this talk of improved performance by disabling the EGR has my interest!

How does one do this disabling of the EGR?

Do you block both hoses leading to it or just one? if just one, which one? the upper or lower hose?

thanks

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D. Chang
Network Integration Engineer
MCSE, CLP, CCNA

Dom,

The egr is a little contraption that sits (on my car) in front of the air cleaner just to left of engine valve cover as you face the car. There is a small vacuum tube leading to it that can be disconnected and plugged. The result will be better gas milage. I have not read anything that makes me think it hurts the engine to do this. The vacuum line to mine was cracked (hence not working) for some time before I noticed the crack and fixed it. Gas milage went down 2 or 3 miles per gallon in my case. Enough for me to take it back off line. I rationalized that better milage is reasonable trade-off for poorer emissions. In SC, there are no emission tests required by law as in some states.

Do a search for you car's egr location/function.

Nic

thanks for the confirmation as to the EGR's usefulness? I've disconnected the lower tube... I had disconnected both tubes over this past weekend but she started rough idling again when the engine was warmed up after a highway run so am hooking the upper tube back on....no apparent reason why it should matter but am putting it back to the way it was when running smoothly.

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D. Chang
Network Integration Engineer
MCSE, CLP, CCNA