Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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How do you check the EGR valve? should there be vacuum at the line on top all the time?
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solarcrew
Mudrunner
Reged: 03/08/03
Posts: 433
Loc: coastal nc
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 Maybe one of the pro's will pop in with the exact answer.I think vacuum increases around 2500 rpm and that opens(or is it closes?)the egr diapram. 
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87'4runner-22re,5spd
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Esquire812
Trail Leader
Reged: 04/25/02
Posts: 5688
Loc: Port Orchard, Washington
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No vaccum to the EGR at idle. Basic way to check EGR function is to apply vaccum directly to the top of the diaphragm while idling (I use a vac line from a VSV)...the engine should stumble and die as soon as vaccum is applied.
The way the EGR works is there is vaccum routed through the BVSV (Beavis  ) from the throttle body. When the BVSV opens due to coolant temperature the system will be active. As the throttle plate rotates open it exposes a vaccum port to manifold vaccum thus applying vaccum to the vaccum modulator above the EGR valve. Exhuast pulses in the egr system are trasmitted to the modulator via that larger hose coming off the side of the EGR valve body...this controls the actuation of the valve inside the EGR. Kinda complicated and requires typing vaccum alot incorrectly....seems overkill for something that is most often plugged with carbon huh? lol
EGR activity shouldnt come into play until above 2000 RPMS +/-. ECU doesnt compensate for its activity until around then. Below that RPM any flow from the EGR valve will be unmetered air and cause the engine to die.
See what I mean Vern?? 
Hope this helps....I'll go looking for the pages that describe the whole process using normal technical terms in detail.
~Darin 
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88' 4x4 *22R-EB Gen II*
87' $Runner *22R-EB Gen I*
85' Sillyca 22R-Esq
"I LIVE IN MY OWN WORLD...THEY KNOW ME WELL THERE"
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Anonymous
Unregistered
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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Thanks for the info, I will check The filter in the modulator and apply vacuum to the EGR and let you know what happens. thanks again.
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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Hey all,
My truck is really running bad now, I can not even drive it now, as soon as you hit the gas it spitters and sputters just at light throttle , idles great. I Put vacuum to the top of the EGR valve and truck stumbles and dies, I check filter on modulator and it looks good. what to check now? There are those two SVS valves or what ever you call them can anyone post a pic or explain which one go where and how the vacuum lines are ran to them. Maybe when I rebuilt the engine I mixed them up?? Man I am running out of ideas anyone have any ideas??
-Rob
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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me again, I put a vavuum guage inline with EGR started truck no vacuum then when got warb BVSV opened and vacuum. I checked the other VSV where you blow in one port and then apply battery voltage to it and air should switch but that one did not seem to work. also with truck set to fatory timing it runs the worse, when I bump it up it seem to run alot better but there is just not anough adjustment. could I be off a tooth maybe? any ideas???
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Anonymous
Unregistered
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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thanks,
I will try that in the morning, when I check for vacuum at EGR none at idle and it only had vacuum when warm you could almost here it click in and slight vacuum at higher idle.
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Anonymous
Unregistered
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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Is the modulator vacuum line connected to the Top of the EGR? mine is hooked down the the metal rail and from the pic you sent mine might be wrong. thanks for all the help. I took the TB off cleaned and blow out all the passages and cleaned the TPS, checked the throttle plate and it dos not block any of the top vacuum ports.
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DRTDEVL
Roll Me Over
Reged: 08/14/01
Posts: 2881
Loc: HELL Paso, TX
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Want me to come over?
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"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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DRTDVL, I just got home, I double checked the EGR vacuum and there is none at idle and under 5 at light throttle and it does not come on till the engine is warm.
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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can I use a newer style 3 port EGR modulator or do I need a specific one for 86 22RE? I looked at a 88 22RE to check the vacuum line to compare to mine and the 88 has a extra VSV 3 total and my 86 has only two DAMN THIS IS STARTING TO $%^&$ ME OFF. Thief what do I check now come on bro pull me through this one?
-Rob
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Anonymous
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Anonymous
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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Thief,
no problem, I just rebuilt the motor,only 3,000 miles on it. bored 40,EB cam,big valves,new plugs,wires. It idles great, as soon as you hit the gas it spitters and runs really bad, checked timing and if you advance it it runs better but still bad, at first it kind of felt like the trans(auto)was slipping then it was getting worse and now I can not even drive it. I thought it was a bad TPS so pulled TB and cleaned TPS checked ok, then went to EGR everything there looks good. I did have my vacuum lines wrong,fixed them and that made it even worse. What do you think? this truck is driving me crazey.
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Anonymous
Unregistered
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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The head was not shaved,new EB cam, it ran good for a few but not very long, I had a bad 02 sensor for a while and my cat is probable origanal, my intake hose was bad at the TB and a glued it up till I can find a new one, but I changed it out with a known good one. I will let you know what I come up with this weekend. Can you use a newer style 3 port modulator valve? are they all the same? I also have another EGR do you think I should change them out? thanks for all the help.
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Anonymous
Unregistered
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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could I have the distrbutor off a tooth or two because it runs better fully advanced,but it like there is not anough adjustment? where do I go from here?
-Rob
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Anonymous
Unregistered
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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Thanks I will check that this weekend. I set the timeing by jumping the plug on driver side, idles drops then use light set at 5 deg. Is that right? I could not make out the decal on the hood and the book says check the hood. what is the valve adjustment for the EB valves? stock? I quess some people have had the same problem as me and the EGR spring was week, I think I will fab up a block off plate and try that aslo. fun,fun. thats what I will be doing this weekend. I will let you know what happens. Later
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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well I put a blockoff plate in and still runs like crap. checked plugs and they look new,wires good.timing set to spec. what am I missing that would cause a stumble just off idle? should I go back to the tps and check that again?
-Rob
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DRTDEVL
Roll Me Over
Reged: 08/14/01
Posts: 2881
Loc: HELL Paso, TX
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How does your rotor look??? I forget when you said the last time you changed out the cap and rotor was...
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"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy
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solarcrew
Mudrunner
Reged: 03/08/03
Posts: 433
Loc: coastal nc
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 Darin or thief mite need to jump in here for comfirmation on this.There is an air gap on the distributor that needs to be checked and gapped.Darin gave me the gap spec's but I forgot.Maybe try the search engine for distributor air gap or someone will chime in quickly.Also check your injector harness.Their known to have bad crimp connections,so if you wiggle it around maybe you'll catch the burp in the motor.Good luck!
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87'4runner-22re,5spd
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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cap,rotor look good. I will check the injector harness in the morning but if that was the fault I think it would cause the probblem through out the RMP range and not just at 1/4 throttle and if you push really slow it will not do it, under load is worse. Thanks for all the help I will let you know what I find tomorrow.
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Anonymous
Unregistered
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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Good points thief, I will drive it today nd let you know,thanks a bunch.
-Rob
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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I just tried to drive it and it kicks and bucks the whole way I dont think I got over 30mph, All intake bolts are tight. I am going to try and put some fresh fuel in it and some dry gas and see if that helps.
-Rob
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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I just topped off the fuel and put some injector cleaner and dry gas in let in run for 10 min, and it seems to be running alittle better, I drove it and got up to 50 still a slight spitter,sputter and hesitation. check fuel pressure regulator with steathiscope and it seems to be pulseating fine all injector are clicking. I think I am going to take the old cat off and hollow it out or put a test pipe in its place.
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Dieselshop
Wheeler
Reged: 02/02/04
Posts: 138
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well I droped the cat or I should say the shell, hollow as can be, I quess that is not glogged then. on to the next thing.
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