removing the egr and pair vsv's (2 Viewers)

[dudedude]

I thought I would put together some photos of a egr and pair vsv removal on a '94
and maybe I can get some reassurance and a some questions answered while I'm at it.


FSM diagram:


Preview of “diag_AuRQ17.png (533×764)” by dudedude51, on Flickr


pair and egr vsv's, bracket and associated vacuum hoses removed


IMG_0816 by dudedude51, on Flickr

remaining fuel pressure and evap vsv's, bracket and associated vacuum hoses bolted to the upper intake

I have some questions on this one:
the circled pipes were for the pair and egr vsv's what do I do with these?
leave them open?
plug them up? if so then with what?

also what is the blue and black thing with the ??? on it, what does it do?

what should I do with the egr and pair electrical connectors? just tape and tuck?


IMG_0817 by dudedude51, on Flickr

and lastly what do I do with this little guy?


IMG_0818 by dudedude51, on Flickr

 

[bsmart82]

Cap all open lines on the intake manifold as it will create vacuum leaks. The blue/black object is a vacuum modulator. I'm not sure what system its for, but if you have removed the line to it, then it can be removed. I also deleted the fuel pressure solenoid and ran a vacuum line from the manifold to the regulator. I also deleted the evap system completely. There are oem vacuum caps for the 3.4l motor available but they are pricey. I used these to caps all my connections but I get a big employee discount.

 

[lt403]

i'll be replacing all those hoses soon

 

[CruiseOrlando]

Cheap way to cap things is to just route them back into themselves. Use vacuum hose and loop stuff up...

 

[swampfoxSC]

I am about to do this to a 94 myself. We need to make this a one source thread for all emission related removal. Including PAIR(93-94). There is info on here. But its all over the place. Lets try and make it very detailed of exactly what you can pull. And keep your rig running right.

 

[dudedude]

alright so pair can be deleted with exhaust manifold block off plates, egr can be deleted with block and manifold block off plates, evap system is deleted including the charcoal canister and vsv and vcv? and the fuel pressure vsv can be deleted and "replaced" with a vacuum line from the manifold? what did you do to the tvv on the intake side block? and I assume just block off all the other vacuum hardlines on the intake manifold? if all of these things are disconnected do you just leave the electronics disconnected also?

bsmart22 any pics of your current set up?

Im going to try to make some more labeled pics for future reference and again this is for '93-'94 with the pair system only.

if anyone has part numbers for oem block off plates or vacuum plugs or anything applicable please post!
as most of our 93-94's are getting up there in age and mileage more of us will be doing HG jobs and this is one of those "while you are in there" things that would be great to document and really nail down a definitive parts list/parts source and can/cant should/shouldn't remove list depending on state emissions and general consensus

 

[swampfoxSC]

Got a question. What do you do with the vent line when you pull the charcoal cannister? I assume it needs to vent to prevent vapor lock or some other issues.

 

[CruiseOrlando]

Subscribed...

 

[jessejman]

oh, this is right in time... Subscribed!

 

[Sept987]

This is the next project on my list. Subscribed!

 

[FrankTorres]

I would not consider removing the EVAP system at all, it is designed to maintain stable pressures in the fuel tank and burn off excess vapors when the motor is warm enough.

read more here...
http://www.autoshop101.com/forms/h62.pdf

 

[bsmart82]

Evap system is more about emmisions than anything else(fuel vapor damaging ozone). If the vent line us left open, the tank won't build any excess pressure, but some fuel will be lost by vapor. This amount is negligible though. Think about how many cars don't have evap systems. I will snap a few more pics today, and there are some in my build thread also.

 

[dudedude]

here is a link to bsmart's build


https://forum.ih8mud.com/80-series-tech/598879-new-80-owner-head-gasket-build.html

I figured I'd start with the PAIR delete

the part number for OEM exhaust block off plates used for deleting the PAIR

manifold block off plates from a yr series van: 17148-41010
the gasket for the exhaust block off plate is: 17376‑66010
Its probably a good idea to replace the studs and nuts:
studs:90116‑08211
nuts:90179‑08059

you can make your own or use these very nice block off plates or replace with
a pair of O2 sensors.

Left O2 Sensor 89465‑69075
Right O2 Sensor 89465‑69065
O2 sensor gasket 89466‑20020

This is a pic of the OEM block off plates

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IMG_0830 by dudedude51, on Flickr[/IMG]

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IMG_0831 by dudedude51, on Flickr[/IMG]

bsmart has some custom aluminium plates in his build thread

anyone have picks of O2 sensors moved into the manifold?
edit: this thread has some pics of the o2 sensors instaled

https://forum.ih8mud.com/80-series-tech/235754-93-one-o2-sensor.html


for the air cleaner side, what has been the best solution?
could you use a later model air cleaner lid with no pair port?
just shove an old sock in it?
is there an OEM plug?

[/url]
IMG_0832 by dudedude51, on Flickr[/IMG]

 

[bsmart82]

Don't use aluminum on the manifolds. I swapped mine for the oem plates since the aluminum started to bow out and leak. My egr plates are aluminum and are holding up great.

 

[CruiseOrlando]

Man, that O2 sensor move is a great idea - they're actually accessible in that location!!

 

[bsmart82]

I removed everything between the intake manifold, removed the evap system, canister, and left the vent hose from the tank and tucked it away in the engine bay. I plan to add a filter to the hose to keep trash out. I also removed the egr valve, modulator, fpr solenoid(and all others), and all vacuum lines to associated items. I ran a vacuum line from the intake manifold to the fpr and the solenoid pack harness plug I just left hanging. The throttle cable bracket where the pair valve was is pn# 78185-60030, it is available through Lexus only. I salvaged one of the brackets from the pair valve and made a L bracket to bolt to the battery tray. The small hose caps are from a taco/4runner 3.4l engine(I don't have the pn handy but can get it if wanted), the larger hose cap is a aftermarket cap. There is also a port under the intake that is blocked off with the smaller cap. The egr ports were blocked off with custom made aluminum plates I made from aluminum flat stock. I used the oem block-off plates for the manifolds, and plan to relocate the O2 sensors to the pair ports. I used a Toyota brake fluid bottle cap to block off the pair port on the air cleaner lid. I plan to swap to a later style lid to eliminate this port and to convert to a newer style maf(another project). Some of the hard vacuum lines just connect components via rubber hose and can be left open(see pics). None of these systems are monitored by the ecu for the 93-94 obd1 models and will not set any engine codes.

 

[jdeitch]

None of these systems are monitored by the ecu for the 93-94 obd1 models and will not set any engine codes.

Excuse my ignorance... I'm a noob. It's my understanding this system is exactly what causes the check engine light and EGR code on my 1994. Please explain.

 

[bsmart82]

Do you or have you had egr codes? According to the fsm for 1993, there are no codes associated with any of these systems, and there are no sensors to detect failure(no egr temp sensor, or vapor pressure sensor for evap). Now its possible that the 94 model is different, but I was under the impression they were the same. California emission spec models are most likely different, so my post above applies to federal emission models. I can double check when I go back to work Wednesday and have access to TIS.

 

[tucker74]

Code 71 on the '93-'94 OBDI trucks is the EGR, you can run a simple jumper in the EGR sensor harness side plug to disable this (or the OEM non-US spec plug I run). I did a very similar de-smog on the 3FE in my FJ40, but it's somewhat less complicated on that engine. Can't delete all of this for 6 more years on my '94 here in Austin, good to know it can be done

Tucker

 

[bsmart82]

I just checked TIS and for the '93 models Code 71 and 26 are listed in the fsm for use on California spec only, and not federal spec. The '93 federal spec does not use an egr temp sensor, which means all emisions systems can be deleted with no cel. For '94 models, codes 71 and 26 are both used since this year has an egr temp sensor. No other emissions systems appear to be monitored and can be removed with no cel. Egr removal for '94 model would require an egr temp sensor bypass with a resistor or the plug mentioned above('93 federal spec comes with this). I will try an locate the pn on this plug and check availability because mine has one.