Blocking Off EGR Valve-Emissions?

Benesesso · 03-05-2006, 03:15 PM

Interesting. If a ported vac. signal is used, then it seems that EGR has no effect at idle.

Hopefully the oxygen sensor/knock detector (I assume Supras have one) will work to protect things.

Anyone know if removing it from a 1990 will set a computer code?

mrnickleye · 03-05-2006, 10:54 PM

Check the egr facts thread in the FAQs section. There are some links to learn all about it.

Yes, the knock sensor will detect any pinging, and retard the timing to protect the engine. But it is a little slow, so there can be pinging for a moment or 2 before it retards.

If you get pinging, you could run premium fuel, and perhaps octane booster. You could retard the timing to 5* (and 0* if needed).

Removal is generally done for looks, and cleaning up the engine bay.

EGR does not work at idle.

Benesesso · 03-05-2006, 11:37 PM

My only reason for blocking it off is because it's so difficult reaching the bolts. But after removing so many bolts, hoses and electrical connections I suppose 2 more won't make much difference.

Just managed to get the exhaust pipe off now--I'm taking a little break. Then comes the 2 difficult inner turbo bolts. Then the exhaust manifold (some of those bolts came off relatively easy). Hopefully by tonight I can actually get the head off and see how much head/block damage there is.

03-05-2006, 03:15 PM	#1
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	Interesting. If a ported vac. signal is used, then it seems that EGR has no effect at idle. Hopefully the oxygen sensor/knock detector (I assume Supras have one) will work to protect things. Anyone know if removing it from a 1990 will set a computer code? __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

03-05-2006, 10:54 PM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Check the egr facts thread in the FAQs section. There are some links to learn all about it. Yes, the knock sensor will detect any pinging, and retard the timing to protect the engine. But it is a little slow, so there can be pinging for a moment or 2 before it retards. If you get pinging, you could run premium fuel, and perhaps octane booster. You could retard the timing to 5* (and 0* if needed). Removal is generally done for looks, and cleaning up the engine bay. EGR does not work at idle. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

03-05-2006, 11:37 PM	#3
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	My only reason for blocking it off is because it's so difficult reaching the bolts. But after removing so many bolts, hoses and electrical connections I suppose 2 more won't make much difference. Just managed to get the exhaust pipe off now--I'm taking a little break. Then comes the 2 difficult inner turbo bolts. Then the exhaust manifold (some of those bolts came off relatively easy). Hopefully by tonight I can actually get the head off and see how much head/block damage there is. __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

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