Bypassing the EGR

Bypassing the EGR

Postby WoodButcher [OP] » December 18th 2010, 2:35am

chevymaher wrote:
thehermit wrote:OK...I sense a little confusion here...

chevymaher: what you've done is to block off the EGR ports on the front of the intake manifold, and reroute the PCV (on one of the valve covers?) to the atmosphere. Correct?

I'm thinkin' I might just do this once spring/summer rolls around. It does make sense to simply set the exhaust go down the exhaust pipe, and the crankcase air just go to atmosphere. This way the engine's breathing cleaner, and quite possibly more efficiently.

Yesterday I took the van down to the mall to pay my cell phone bill. It had rained the day before, so it was a little slick out, but not too bad. I'm still not quite sure if the van just doesn't like this weather, or if it's got more serious issues. Seeing as it's not summer, and I don't have a shop/garage to work in, I don't really want to do any work on it. Oh well, as long as it doesn't quit on me!

Yes block EGR and reroute PVC and I added extra one on other valve cover where it connected to breather or plenum whichever yours has.It makes a huge difference in part throttle operation and oil consumption of van



grasshopper wrote:
chevymaher wrote:Yes that stopping oil from coming from engine to intake that the PVCs EGR should be bolted to intake I go look and see if I can find illustration for your type engine


The EGR is molded in the upper intake. To remove it it takes a quarter turn and it pulls out with a rubber o-ring seal.
I only plugged the port to this EGR.
Maybe this could be a thread of its own. But if the emission enforcers get wind of this they could cry foul?




Yeah, I agree, this needs a thread. A few questions, for me anyway,
I cleaned my EGR and added the clean screen chasing a code which is now reading as random misfire which I'm working on as the weather permits.
Is this something that will improve our vans performance?
Won't this throw a code thereby alerting the emissions police?
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Re: Bypassing the EGR

Postby chevymaher » December 18th 2010, 2:44am

As for emissions police I dont have to deal with them. Do what we used to do when we had emissions here hook it up right to smog then go home and put it back.Yes it makes a big difference in performance on mine.My niebor ask me if I put on a different muffler because it sounded so deep now.Nope same holes in my muffler I talked about in another thread now it just running right.It amazing how little gas I have to give it to pull hills now on freeway.Half throttle on steep hills to almost nothing.Punch it and we got wheelspin now.
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Re: Bypassing the EGR

Postby WoodButcher [OP] » December 18th 2010, 3:30pm

Does it give a code? engine light on?
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Re: Bypassing the EGR

Postby chevymaher » December 18th 2010, 3:49pm

No it gives mine no code light.I tried to make video of thing running because it sounds awsome now as example.But even with holes in muffler I made it still quiet enough it wont pick it up.It not quite as loud as a stock dodge truck.
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Re: Bypassing the EGR

Postby WoodButcher [OP] » December 19th 2010, 3:58am

Cool, I'm going to give this a try. I'lll make a gasket of tin for the EGR, rubber cap on the intake port and the two valve cover s will be vented down and out with soft copper tubing.
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Re: Bypassing the EGR

Postby phessler » December 19th 2010, 1:23pm

I am curious to know how this has affected your fuel economy.
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Re: Bypassing the EGR

Postby chevymaher » December 19th 2010, 1:42pm

I have not actually checked it.But a trip that used to take a quarter tank is not using a quarter tank anymore.I think it doing better.Makes sense I giving it half as much gas to hold speed on the freeway.It runs like a 250 hp two bbl 350 in an older impala now.That the way it acts and sounds.I cant believe I did not do this a long time ago.I always did this stuff to my cars.But I never considered it racey just transportation so untill it whacked me off because it struggled up hills so much.I looked up flow numbers on these heads.Per cylinder they the same as a 350hp/350.Do the math that 300 hp.So I figured with tuning I could get alot more out of it than advertised 200 hp.I beating mustangs on a regular basis now so it definately puttin out more than stock.EGR PVC A little port matching Timing opened up the exhaust some.Anything free I could do to her.It all works on my race cars I knew it would on this motor to.It a true vortec got the counterbalance shaft and all.I encourage these mods van a different animal and it can all be done except port matching in a few hours.
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Re: Bypassing the EGR

Postby chevymaher » December 19th 2010, 1:51pm

WoodButcher wrote:Cool, I'm going to give this a try. I'lll make a gasket of tin for the EGR, rubber cap on the intake port and the two valve cover s will be vented down and out with soft copper tubing.

I used aquarium tubing that clear stuff for air pump.It actually came from fountain pump
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Re: Bypassing the EGR

Postby bosco2023 » December 19th 2010, 9:06pm

Is your van a throttle body 4.3. I really think it will throw a code on my 94 4.3.
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Re: Bypassing the EGR

Postby chevymaher » December 19th 2010, 9:11pm

Yes a TBI 94 safari
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Re: Bypassing the EGR

Postby WoodButcher [OP] » December 20th 2010, 11:00pm

Done an' did!. I made a solid gasket from tin to replace the "cleanscreen" on the EGR, disconnected the breather tube from the valve cover to the intake behind the MAF, capped the intake. On the other side pulled the PCV and put a piece of hose over the valve about a foot in length, tucked the open end away so it gets clean dry air. (I was thinking maybe to run this hose to the intake that I capped, It would be getting filtered air,,, :think: any thoughts on this?) Ran another length from the valve cover away to the back of the engine. I got pics so when I have the oportunity I'll post them up.
I've only run a few miles so far, CM, I think wheelspin in my case would be a whopper of a tale but I did notice improvement. 31"x 10.50" on the rear and generally overloaded kinda kill any hopes of smoking rubber. Not bad for the snow but not much for the strip! :layrubber: :rofl:
I had hesitation when getting on it, that is gone, a code was coming up for random misfire, so far that has not come back. When first run I got a "pending code" notice of p0174, too lean (using the UltraGuage) but I believe the computer has made adjustments as it never turned on the engine light.
So far so good, I'm very happy CM, thanks for the tip. :clap: :ty:
I'll keep you all updated.
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Re: Bypassing the EGR

Postby chevymaher » December 20th 2010, 11:12pm

Did you crank the timing up.I do got wheel spin.Your tires alot bigger to.Dead stop straight line she spins on dry pavement.Pulling on the main road right hander I nail it then she runs through first into second before it stops spinning.That was new just have to watch drillin her till I going straight.it took a couple days for my computer to ajust to.
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Re: Bypassing the EGR

Postby thedarkshadow » December 20th 2010, 11:43pm

Ok you've seriously got my curiosity peaked...how far did you crank the Timing after doing the bi-pass and is there a trick to doing the timing on these beasts?? :think:

Thanx so much and I'll keep ya posted on what happens w/our beast....
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Re: Bypassing the EGR

Postby chevymaher » December 21st 2010, 12:01am

Sorry answer took so long had to send pic back to e mail load into computer and picture to dark so I had to photoshop it to lighten it up.Anyway loosen bolt at base of distributor with it runnin turn clock wise it will idle faster. then it will start to miss again back it up till it smooth.Picture is where mine at like I said in last post flat part of distributor basically pointing at your right leg as you sit in seat.Just go a little less than picture shows and you will be good.If you go to far it will miss like crazy.My initial timing is 16-18 degrees now 12-14 you will see a big improvement with out risking to much.That why I sayin use a little less than I got so you safe.I brake torqued it in gear to see if it right but I a hillbilly old school fart
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Re: Bypassing the EGR

Postby WoodButcher [OP] » December 21st 2010, 12:29am

ROFL!
Seems we're in the same boat. You old fart! :rofl:
No, I didn't touch the timing, I've changed it in the past but now runs good where it's at. Idle is smooth at 550- 600 rpm, no hesitation. If I tromp the gas in a corner I will break loose and drift like the kiddies do. No, really, I avoid that kind of driving as this is my 3rd rear end since I bought it in '01. Tools, rack w/ ladders, often more material than I care to carry, I'm hard enough on my trucks w/o adding foolishness. I would like to find another to play with if I could manage the funds!
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Re: Bypassing the EGR

Postby chevymaher » December 21st 2010, 12:44am

Like I said in other post I wont load mine down I treat it like my chevelles and camaros ive had.I dont beat it to death but I do like showing the V-8 mustangs and trucks what up.Obviously I well known around here for these shananigans so no one really surprised.I limit wheel spin because I like my expensive tires to much and the rear end be getting posi and beefed up but in the mean time I dont want to tear her up she my driver.Roll in the throttle till half if the car next to me gets frisky nail it.That about all I do she my baby.
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Re: Bypassing the EGR

Postby Artistro » December 23rd 2010, 3:24am

I'm wondering what kind of effect these mods would have on a second generation van. I remember reading something about the timing being completely controlled by the ecu, but the egr block might work although it is electronic as opposed to vacuum. Either way great post!
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Re: Bypassing the EGR

Postby chevymaher » December 23rd 2010, 4:12am

I dont know about computer on yours since it different year(gen 2).But my timing and EGR both computer controlled on my van.No vacuum on either.It acts silly till computer levels out on mine.Then it over it and it runs great.Ran better imediately but had a couple quirks.Rolling into throttle from half to full it pulled better than before then pulled harder a few seconds later like 4BBL would act.second trip after change just runs when you give it gas.other quirk was started idled then missed a few seconds second time I started it.Never done it since.I chalked that one up to air in fuel line since it just had intake off for gaskets.It been running flawlessly since second day without fail.
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Re: Bypassing the EGR

Postby Artistro » December 23rd 2010, 4:26am

Okay I've got to try this. Do you think all three are necessary at once? I'm going to block the egr with a hand made plate, disconnect the crankcase ventilation tube and run it to the back of the engine compartment(?), and advance the timing on the distributer. I might start with just the egr plate and see how that works out. I recently cleaned it up and put the clean screen on and after seeing all that carbon build-up I don't understand how this could possibly do anything positive for the engine to re-breath it's own crap! Thanks for the great and cheap performance ideas!
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Re: Bypassing the EGR

Postby chevymaher » December 23rd 2010, 2:04pm

I waited forever to do the EGR because like you I was afraid it would mess up the computer on mine to.Then I met a guy who did it to his.I looked through old threads here and way back someone had done it.Same thing with the timing.But there that easy to put back if it did not work so I did that years ago.PVC I did years ago.When the intake went was when I did the EGR.I was figuring the engine was gone after the water in the oil so what the harm.But so far everything roses.
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