Modifications I did and I need everyones thoughts

Modifications I did and I need everyones thoughts

Postby KHPower [OP] » June 28th 2010, 8:06pm

I have read the "hot rodding a 4.3" and many , many other blogs bout how to make the 4.3 v6 run a little better.

i did (4) things last night and since I am a tad inexperienced I would like to know if what I did was good or bad to my motor and what not?

1.First I removed the aire intake tubing until i can install the ductwork to somewhere where more air flow would be better and also added a K and n filter(because thats all orileys had) and the retrictor thingy that opens up on the intake? i pryed that open so its open 100% of the time

I apologize for not knowing what all he parts are called so p[lease bear with me and hopefully some of the oics tell ya what ive been doing

2. On the drivers side crank case that tube here that leads from my crank case to my tbi that is suppose to reburn the oil gasses? well i didnt want my tbi getttin all filthy anymore so I unhooked it from the TBI and boucht some tubing and ran the exhaust under my van a ways down so the smoke would go elsewhere than under my hood.
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So basicly Im running the tubing well under the van from the crank case exhaust instead of the tibi

3.the right tube input on the TBI that leads to the right passenger side crank case that has suck-shun well I did this to that port on the tbi
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I plan on running it to a cooler place but this is just a test and is why im on this wonderful forum to ask these questions

4. Now we have that thingy thats lodged in the right crank case that make a rattling noice , PCV valve? and how I did the same to that port as i did with the drivers side crank case
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I have noticed increased horsepower. no gas smell and it seems that shes running very well. i do not have anything on the tbi port from the tube to the drivers sidfe crankcase sould i block that? of find a way to opus more air through that?

Any and all criticism is appreciated and all knowledge on this is helpful. im not looking to make this thing crazy fast of anything but just run as a good as it can for what it is. a ol 88 GMC Safari van hats lost a little kick over time

Thanks everyone in advance
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Re: Modifications I did and I need everyones thoughts

Postby workinVan » June 29th 2010, 12:19am

well just an fyi for now
but it looks like regular tubing that your using and that stuff doesn't hold up well when exposed to co2, it will break down pretty quick and possibly melt in excess heat exposure.
the black tubing would be a better choice for longevity

and the little air filter you have hooked up you could put directly on the hook up with out the tube.
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Re: Modifications I did and I need everyones thoughts

Postby Mr_Bowtie » June 29th 2010, 2:18am

I would never remove a PCV valve from the engine setup & it works with vacuum. It set up to work in a closed system & keeps your motor clean. Keep an eye out for oil useage or blow by out those tubes. I doubt there was a huge increase an anything by just removing the PCV & routing the tube from the TBI to somewhere else.

But, I'm no expert....so I await the more knowledgable ones to tell us what they think.

Interesting choices of mods....I give you credit for doing them and posting them up here for us to discuss further! :clap:
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Re: Modifications I did and I need everyones thoughts

Postby KHPower [OP] » June 29th 2010, 2:47am

Mr_Bowtie wrote:I would never remove a PCV valve from the engine setup & it works with vacuum. It set up to work in a closed system & keeps your motor clean. Keep an eye out for oil useage or blow by out those tubes. I doubt there was a huge increase an anything by just removing the PCV & routing the tube from the TBI to somewhere else.

But, I'm no expert....so I await the more knowledgable ones to tell us what they think.

Interesting choices of mods....I give you credit for doing them and posting them up here for us to discuss further! :clap:


So your saying the rightside crancase pcv valve that sucks up the motor smoke into the tbi is a good thing for my tbi? the only reason i did all this was to keep a clean tbi/ and believe it or not I do get more torque so yes id like to find out more of why the pcv valves oily smoke would be good for my tbi.

Not to sound rude or anything :)
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Re: Modifications I did and I need everyones thoughts

Postby $uperJoe » June 29th 2010, 3:07am

have you drove it for a long period of time with that set up? i would think the temperature from the exhaust would melt that clear hose and then be a potential fire hazard. keep a keen eye on that. a plastic fire would probably total a van inside 10 minutes.

as for the pcv not being hooked up it is not a big deal either way. race trucks do not have a pcv and small hose on them. they are rebuilt engines at least twice a year though. the factory set up is so that it will reduce potential carbon build up inside the valve covers and help promote long engine life. if it is not being sucked out then only the fumes by the vent will be pushed out from crank case pressure. i do know that in some states having the current setup you do and also having it on the road is a federal fine of up to 25000 bucks and is enforced by the epa.
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Re: Modifications I did and I need everyones thoughts

Postby KHPower [OP] » June 29th 2010, 4:27am

I undertsand why they have it set up this way regarding the pcv valve but i find no reason on a performance stand ponit of how this is helping . yes it tries and burns this carbon smoke and then sends it out the exaust but im just meesin around to see if i can actually get better horsepower and torque from this vehicle. the egr is already shot has been for years and if there is no ther reason then to be "envirmentally safe" then iwould like to know what if any performance this increases. not to sound like i hate the enviorment just playing around and learning more on motors.

also , the tubing doesnt even touch the exaust it juts takes the crancase fumes out underneathe the vanl
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Re: Modifications I did and I need everyones thoughts

Postby KHPower [OP] » June 29th 2010, 4:44am

Wait mayb I do understand. So would i be okay just running the pcv valve back to the the TBI but still keping the drivers side crankcase the same?
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Re: Modifications I did and I need everyones thoughts

Postby jeff's93astro » June 29th 2010, 7:22am

i would hook the pcv valve back up
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Re: Modifications I did and I need everyones thoughts

Postby Astroplane » June 29th 2010, 8:26am

Nice pics, keep us updated on what you do.
The PCV valve is a metered vacuum leak. Meaning, the fuel management calibration is taking that factory leak into account. There is a spring and plate inside the valve. The breather you have now on the hose to the TBI is a wide open vacuum leak which could cause a slight increase in performance at the risk of running the engine lean.
KHPower wrote:the retrictor thingy that opens up on the intake?

Are you referring to the flap in the air cleaner? Thermactor. Designed to pull heated air from the surface of the exhaust manifold to help reduce cold start emissions.
Thoughts on the EGR valve: Since the ECM is calibrated for a properly working valve, see what you can do to make the EGR work. That valve will help cool combustion temps to reduce NOx.
The price of paying attention is cheap considering the alternative.
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Re: Modifications I did and I need everyones thoughts

Postby KHPower [OP] » June 29th 2010, 9:09am

jeff's93astro wrote:i would hook the pcv valve back up


Okay k aI can o that easiy , but is it still okay theat I take the frivers side crankcase tubig away fri the tbi an dleavit runnig underneath the van>
Does any one see a problem with hooking back up the egr valve back to the tbe and the just leavig the crankcade tube in the driver sid the same away from the tbi aand ran towards the miiddle of the van ,

Aso , could somene please explain to me what damage if abny i am doing with the current setup/ ANS ALSO IS THERE ANY OTHERE COOL PLAE i can mount that smaller spectre filter?

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Re: Modifications I did and I need everyones thoughts

Postby $uperJoe » June 29th 2010, 9:27am

what? are you typing from a phone? some of the letters are missing and its hard to make out your sentences.
Don't explain it poorly 5 times. Take the 15 seconds to go out and take a picture of it!!
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Re: Modifications I did and I need everyones thoughts

Postby KHPower [OP] » June 29th 2010, 3:05pm

jeff's93astro wrote:i would hook the pcv valve back up


Okay i cand do that easily , but is it still okay that I take the drivers side crankcase tubing
away from the tbi an
and leave air running under the vqn underneath the van?
Does any one see a problem with hooking back up the egr valve back to the TBI and the just leaving the crank case tube in the driver side the same away from the tbi


Also if i do convert back what do i do with my cool spectre filter?

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Re: Modifications I did and I need everyones thoughts

Postby KHPower [OP] » June 29th 2010, 3:07pm

$uperJoe wrote:what? are you typing from a phone? some of the letters are missing and its hard to make out your sentences.


Ye s sir and I apologize for that. i work the night shift and i hope to reply to all info at night so when I get up everyones already chimed in. i looked at my spelling this morning and it looks like a drunk 4 year old wrote it. Sorry guys
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Re: Modifications I did and I need everyones thoughts

Postby lotuseclat767 » June 29th 2010, 3:25pm

Hook your PCV valve back up! It won't give you any more power. It is an integral part of the emissions control system and in some states it will not pass an emissions test. PCV good.

Now, as for the dirty TBI, routine maintenance will keep it clean. My favorite technique is to remove the breather, and while the engine is running, slowly pour Sea Foam into the TB without choking down the engine. I usually use two cap fulls of the stuff per service. The rest of the Sea Foam just dump into the tank with a full tank of gas. Talk about your fuel injection tune up in a can! My fleet of five vehicles have run smoothly and problem free since I've started this regimen.

I may get flamed on this, but, the little flapper in the breather, hook it back up! It acts as a "choke" during cold start. Make sure the little tin foil looking tube is also connected to it. Mine went missing during my engine swap and I ran it for years without the tube. There were times that engine would run richer than it should and I eventually determined that the little flapper was only partially opened. Replaced the little tin foil tube and all is well.

Your "horsepower" gain was from the addition of the K&N air filter. Every vehicle I've added these filters to have suddenly become more responsive and I've even noticed a gain of gas mileage in my little hot rod truck. Another help that really works if done right, "ram air". Tightly clamp a dryer hose to the snout on your breather, route it down through the engine compartment and put the other end somewhere where it can get fresh air. I haven't tried this on my Astro yet, but, my Dakota R/T, Lotus, and both my wife's PT Cruisers have this modification done and it really does work. Actually, I've been doing this little trick to my vehicles since the late 1970's. Cold air into an engine produces a little more horsepower and improved throttle response. Caveat, some vehicles respond well to "ram air" and others just don't seem to make any difference at all.

One big improvement you can make to throttle response is to replace the factory muffler with a Flowmaster. I have yet to find a person in my circle who have not had even a minor improvement by replacing their mufflers with a Flowmaster. Besides, they sound really cool also. People debate on this next one, use a platinum or better plug. All of my vehicles run either on Bosch or NGK platinum plugs and every vehicle has stayed in better tune, ran more responsive and actually improved gas mileage. Go with a high quality ignition wire also. Don't forget to upgrade your coil to a better coil with higher voltage rating. Hotter spark means more efficiency during the combustion process. Also, people suggest indexing the spark plugs, I've always been too lazy to try that little trick.

For the ultimate power gain, try a V-8!
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Re: Modifications I did and I need everyones thoughts

Postby JaxSPL » June 29th 2010, 4:26pm

If you increase the amount of cold air coming in, you really should think about increasing the amount of hot air going out (exhaust). One without the other is pretty much useless. Yes, you'll see some gain, but not get the full benefits of having both.

I have seen filters put in place of the PCV valve. Usually the get dirty and clogged, then don't do the job.

For the ultimate power gain, try a V-8!


Exactly. God I can't wait until I'm able to do that.
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Re: Modifications I did and I need everyones thoughts

Postby afroedastro » June 29th 2010, 6:16pm

Very few home made "tricks" really work. You might give your van some love and change the PCV valve, fuel filter, and a good tune up with cap, plugs, wires, rotor, and any other check engine goodies it needs. Advance the Dist CCW @ 2* and try that.

+1 on the Sea Foam treatment.

Check ALL of your vacuum lines for cracks and leaks. My guess is replace them all as the small diameter,hard plastic vac. lines will crumble. You will probably see some real world power gains with what I have suggested.
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Re: Modifications I did and I need everyones thoughts

Postby Mr_Bowtie » June 30th 2010, 2:26am

Plain and simple...

If you want long life out of your motor then keep it stock and well maintained....


If you want performance out of your motor/Van get your wallet out for real mods....


Gotta pay to play or your just pretending!!! :lol:
1985 Astro - 350/700r4....loud & low! :chevy:
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'68 VW Bug 1600cc
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Re: Modifications I did and I need everyones thoughts

Postby KHPower [OP] » June 30th 2010, 8:32am

afroedastro wrote:Very few home made "tricks" really work. You might give your van some love and change the PCV valve, fuel filter, and a good tune up with cap, plugs, wires, rotor, and any other check engine goodies it needs. Advance the Dist CCW @ 2* and try that.

+1 on the Sea Foam treatment.

Check ALL of your vacuum lines for cracks and leaks. My guess is replace them all as the small diameter,hard plastic vac. lines will crumble. You will probably see some real world power gains with what I have suggested.
Barry :2:



Thanks for all the suugeestions! And "afroedastro what di you mean by Advance the Dist CCW @ 2* and try that
1988 GMC SafarI 292 4.3 L V6 Motor "Z" metallic red 200,000 + miles
Audio System (1) AWT Linear Compression 5cf ported tuned to 32 ran on a 2200HC and a 3800 Kinetik
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Re: Modifications I did and I need everyones thoughts

Postby astroturf » June 30th 2010, 1:36pm

KHPower wrote:
$uperJoe wrote:what? are you typing from a phone? some of the letters are missing and its hard to make out your sentences.


Ye s sir and I apologize for that. i work the night shift and i hope to reply to all info at night so when I get up everyones already chimed in. i looked at my spelling this morning and it looks like a drunk 4 year old wrote it. Sorry guys


Ah, Its OK, We know you're not 4... But Drunk, well that may be another story. May I suggest an iPhone...
My Cup is neither half empty nor half full... But has a hole in it. Holy Cup Holders Batman. LOLz, Jim
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Re: Modifications I did and I need everyones thoughts

Postby KHPower [OP] » June 30th 2010, 2:56pm

astroturf wrote:
KHPower wrote:
$uperJoe wrote:what? are you typing from a phone? some of the letters are missing and its hard to make out your sentences.


Ye s sir and I apologize for that. i work the night shift and i hope to reply to all info at night so when I get up everyones already chimed in. i looked at my spelling this morning and it looks like a drunk 4 year old wrote it. Sorry guys


Ah, Its OK, We know you're not 4... But Drunk, well that may be another story. May I suggest an iPhone...


LOL
I read all of your replies everyone and it seems I might of did more harm than good in some of your eyes. Its hard to tell from the way the van is running well. Stil idles a little rough at times but has done that for years
Just to clear things up , the reason why I did these few mods regarding the PCV valve on the right side crank case and the other hose from the left crank case to the TBI wasn’t to keep the TBI “Clean” I’ve always thought that the cleaner ,cold air and mass flow to the TBI is the TBI’s optimal need to perform the best, When I think about what the PCV valve and the other tube on the other crankcase pushing hot and smoky un-burnt oil back into the TBI it kinda defeats the wants of what a TBI needas to perfrom great correct?

I read a good amount on the EGR system and when it properly working it does help the atmosphere a little ect… But My vans actual EGR valve has been disabled for probably 8 years. The mechanic then just pulled the tube from the EGR valve and shoved a screw in the tube and said “don’t worry about it it will run better now”


So Iets say I hook the PCV valve up back to the port of the TBI just like from the factory , What performance will I get? And if there is bad resuts in the way I have it rigged now what bad results will happen?
I notice with it plugged in normally my idle almost shakes the whole motor but when its ran out with a tube to the spectra filter like bit the pics the idle is higher and it does seem to run better

The van needed a small over hall of cheaper mods (kinda) here what I have done in the last year or so.
1.Changed the gas filter(after running fuel cleaner and system cleaner treatments

2. Last oil change I did what another recommended as a performance upgrade on this forum: I changed to a Wix oil filter and now I run royal Purple (I chose 10 w 40 after weeks of contemplating)
3. tried every spark plug from what’s recommended from the factory , Bosch platinum’s(the whole line of em) then now I went with the E3s and noticed no more fouling in the first spark plug closest to the grill like it always has and a better idel.
4. ran seafoam through the break booster a couple times to clean out the upper intake also through the fuel and oil (40 miles b4 I changed the oil)

5. ive also replaced the cap and rotor with a MSD one and then got a MSD higher voltage distributor but have yet to change the spark plug wires from the AC delcos that are most likely the originals

BTW I was typing from a Touch pro 2 wth 10 people asking me questions lol so I don’t think a iphone would help 

Other than that fellas shes running very well and I might today buy a screendled EGR gasket. Id also like to hear a few others chme in on what I have done. We have NO emissions testing or anything to worry bout here that why I might just rip off my performance robbing cat of get a high flo one

Thanks everyone
1988 GMC SafarI 292 4.3 L V6 Motor "Z" metallic red 200,000 + miles
Audio System (1) AWT Linear Compression 5cf ported tuned to 32 ran on a 2200HC and a 3800 Kinetik
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