^ I think he just used a different type of resistor.
Thats the resistor I used and have been po401 free for almost a week
Thats the resistor I used and have been po401 free for almost a week
Who has removed their EGR valve?
- Thread starter gotmud
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
- Thread starter
- #42
I used a standard metal film resistor. I think the other thread mentions a ceramic style.
Unless the '97 has different values for the gas temp resistance, your 1K ohm will be outside of the "normal zone" and may cause your ECU to think the exhaust temps are higher than they should be. I'm by no means an expert here, just saying.
Unless the '97 has different values for the gas temp resistance, your 1K ohm will be outside of the "normal zone" and may cause your ECU to think the exhaust temps are higher than they should be. I'm by no means an expert here, just saying.
What value of ohm resistor did you use? Sorry if it is posted in one of the pictures above, but I can view images right now.
I'm not even close to being an expert on electrical work, the 1K ohm is just what Bear80 recommended in his update to the original thread.
So if the 1K ohm does indeed cause the ECU to think the exhaust temps are higher, does that mean it would dump more fuel into the a/f ratio to help cool the motor?
Last edited:
- Thread starter
- #44
Based on the FSM values, I used a 3.9K, .5 watt
Updates...?
Gotmud and others who removed egr parts totally, when you blocked off the intake side the other side comes off the head right? Where you able to access it with everything still intact or did you have to take some parts off ie. intake, head ect?
Gotmud and others who removed egr parts totally, when you blocked off the intake side the other side comes off the head right? Where you able to access it with everything still intact or did you have to take some parts off ie. intake, head ect?
From the '97 FSM
Code:
Temperature Resistance
50°C (122°F) 64 - 97 kW
100°C (212°F) 11 - 16 kW
150°C (302°F) 2 - 4 kWBased on these values wouldn't we want a resistor between 11 and 16 kW? With your 3.9k, won't the EGR system always think it's running too hot?
Last edited:
alia176
SILVER Star
3.9 Kohm probably tells the engine that it is now up to temperature, not necessarily "running too hot". Please don't confuse Kilo Ohms with Kilo Watts!!
another great side effect of having no EGR is that you no longer have the cruddy exh crap going back into the intake. Couple that with PCV, you have a sticky varnish that is impossible to remove unless you remove the intake manifolds.
I questions the 'lean' condition after EGR deletion as the gas is basically inert. But it does lower the NOX output as well as lower the combustion pressure across the cylinders.
If I didn't live in a SMOG county, I would've done something similar. I might still do it just to see if I can do it.
another great side effect of having no EGR is that you no longer have the cruddy exh crap going back into the intake. Couple that with PCV, you have a sticky varnish that is impossible to remove unless you remove the intake manifolds.
I questions the 'lean' condition after EGR deletion as the gas is basically inert. But it does lower the NOX output as well as lower the combustion pressure across the cylinders.
If I didn't live in a SMOG county, I would've done something similar. I might still do it just to see if I can do it.
- Thread starter
- #48
I had my engine out of the vehicle for a complete rebuild so accessing it wasn't an issue. I installed a pipe plug on the intake side of the head where the EGR pipe mounted. I left the exhaust side alone (the part covered up by the exhaust manifold) I then made a block-off plate for the air intake runners and plugged the vacuum lines.
I just plugged the vacuum lines and installed a resistor in case I have to do a visual check in the future. I haven't been able to confirm if the system is totally disabled, but the EGR valve doesn't feel very hot after the engine has been running. I'm assuming the vacuum is what is sucking up the exhaust through the intake.
I noticed that the quoted part said kW and not K Ohm....
Odd part is, that's a copy/paste from the FSM PDF.
OK, so riddle me this 'mudders;
my 02/93 built, non-california '80 has no egr temp probe- just a factory plug/jumper.
or
?
can or should I put a resistor in place of the jumper/plug? can I just disable the EGR by plugging the vacuum at the egr modulator or the egr valve itself, or the line that connects them? Mercedes guys use BB's I hear.....
discuss...
my 02/93 built, non-california '80 has no egr temp probe- just a factory plug/jumper.
or?can or should I put a resistor in place of the jumper/plug? can I just disable the EGR by plugging the vacuum at the egr modulator or the egr valve itself, or the line that connects them? Mercedes guys use BB's I hear.....
discuss...
More date--
Over the weekend, capped the hoses and put in 3.9kOhm resistor from the shack. cleared P0401 code and drove 5 minutes. All seems fine. I'll continue to record fuel mileage as I have for the past 3 years and see if there's any change. thanks to all and the great info.
Over the weekend, capped the hoses and put in 3.9kOhm resistor from the shack. cleared P0401 code and drove 5 minutes. All seems fine. I'll continue to record fuel mileage as I have for the past 3 years and see if there's any change. thanks to all and the great info.
Posted my thread on how to disable the EGR system the OEM(ish) way.
https://forum.ih8mud.com/80-series-tech/308200-disable-egr-system-mostly-toyota-way.html
https://forum.ih8mud.com/80-series-tech/308200-disable-egr-system-mostly-toyota-way.html
UPDATE---
after a few fillups after the egr disabling, i can report the following:
didn't really have any drivability issues before and nothing is really noticed different after, but i believe mileage has improved. i try to record 5-10 fillups each year and am careful to always fillup w/ car angling down and always more than 10 gals, etc.. to offset variables. below is my log:
2005 14.1 avg 7 stats city 36 psi
2006 13.4 avg 6 stats city 36 psi
13.5 hiway 36 psi, no a/c, 75 mph
2007 13.0 city 37 psi new tires march
15.0 mixed 37 psi aug
2008 12.9 avg 6 stats city 37 psi
15.2 most hiway new wires/plugs/distr/rotor/O2 sens jul
2009 12.5 5 stats city
14.5 2 stats hiway 70 avg
bypassed egr
13.7 city
13.2 city
13.4 mostly city
you can see that mileage the past 3 yrs was declining. after egr, past 3 fillups has been back to '06 levels. prob. need more data to be conclusive, but interesting i thought.
after a few fillups after the egr disabling, i can report the following:
didn't really have any drivability issues before and nothing is really noticed different after, but i believe mileage has improved. i try to record 5-10 fillups each year and am careful to always fillup w/ car angling down and always more than 10 gals, etc.. to offset variables. below is my log:
2005 14.1 avg 7 stats city 36 psi
2006 13.4 avg 6 stats city 36 psi
13.5 hiway 36 psi, no a/c, 75 mph
2007 13.0 city 37 psi new tires march
15.0 mixed 37 psi aug
2008 12.9 avg 6 stats city 37 psi
15.2 most hiway new wires/plugs/distr/rotor/O2 sens jul
2009 12.5 5 stats city
14.5 2 stats hiway 70 avg
bypassed egr
13.7 city
13.2 city
13.4 mostly city
you can see that mileage the past 3 yrs was declining. after egr, past 3 fillups has been back to '06 levels. prob. need more data to be conclusive, but interesting i thought.
yeah....your mileage gains are about what I have noticed with mine, maybe 1 mpg gain on average......not huge numbers by any means but every little bit helps.
From what I have read, the 3FE seems to benefit from this mod the most, they seem to be getting good gains in mileage and performance...
I think more than anything its the slightly better throttle response and smoothness that I appreciate from doing this.
BTW, I have had the egr disabled with the resistor mod for over 10k miles now with no issues or CEL.
From what I have read, the 3FE seems to benefit from this mod the most, they seem to be getting good gains in mileage and performance...
I think more than anything its the slightly better throttle response and smoothness that I appreciate from doing this.
BTW, I have had the egr disabled with the resistor mod for over 10k miles now with no issues or CEL.
