Porting the Intake Manifold
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NewZJ
I Don't Know
My driving style is completely erratic.
I take short trips constantly for 3 or 4 days then drive up to 3 hours non-stop highway and park it for a month, then drive 3 hours home and the cycle repeats.
I try and drive it harder on the short trips after it has warmed up a bit. And the highway miles are all mpg oriented usually driving 55-60.
I take short trips constantly for 3 or 4 days then drive up to 3 hours non-stop highway and park it for a month, then drive 3 hours home and the cycle repeats.
I try and drive it harder on the short trips after it has warmed up a bit. And the highway miles are all mpg oriented usually driving 55-60.
Luv2xlr8
New member
Just noticed the tumblers you guys are talking about, I had something similar on my civic except it was on the intake manifold gasket and was called the "Venturi plate" made by spoon sports. Good for auto crossing but for redlining it each for example at the drag strip wasn't good.
Do the 1.8s have these as well?
Do the 1.8s have these as well?
sx sonic
New member
Hmm well it sounds like you take steps to clean it out on short trips and those long drives should help keep it from getting fouled up. I usually do 15-50 min drives usually putzing around or doing the speed limit, a few super short trips, and occasionally runner balls out. Doesn't sound terribly different than your commutes, maybe those few short trips still do it, or maybe yours is just a bit different.
I remember reading that some people were seeing more residue from the PCV system in the intake tract (charge tubes or turbo inlet) then others. A few made oil catch cans that seemed to remedy the problem, maybe something you should look into.
Link to thread:http://www.sonicownersforum.com/for...ing-oil-catch-can-accessing-your-tophats.html
Not sure if the 1.8s have it, several members have asked but I've not heard of nor seen anyone taking the manifold off and looking.
vento
New member
So.. Im gonna be buying a new intake to try this on, hoping to find a salvage car (rear end damage would be preferred). I rather take some time porting/cleaning it first before putting it on and still be able to drive.
Also, does anyone have instructions on how to bleed the fuel pressure... never had to do that before.
Also, does anyone have instructions on how to bleed the fuel pressure... never had to do that before.
I just unbolted the fuel rail with the injectors/fuel line still intact and moved it out of the way as stated on the first page. No need to bleed fuel pressure though. As long as the injectors stay in the rail, and the fuel lines stays connected, no fuel will spill during this process.
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sx sonic
New member
Maybe
If it has the "tumblers" in the runners like the 1.4t mani then Yes.
Look up a few post and you'll see no one has confirmed if the 1.8 has a similar intake mani.
AdorableKaren
Asian Elite
sx does this work for my 1.4t auto or just manual?
sx sonic
New member
Go for it! At the very least we will all know more about the 1.8's intake, and at the most you'll get alot better topend pull.
Take lots of pictures either way.
Yep works for both transmissions.
Are you gonna pull the trigger on this mod?
AdorableKaren
Asian Elite
In the future 
sx sonic
New member
In the future
That-a-girl! This mod makes a big difference.
Stew
Sedans Rule!
You may want to hold off, I found this cutaway pic of the 1.8 intake manifold and it doesn't look like there are any tumblers, or anything you could get to easily.
The picture could stand to be a little larger to give a better view though, and holy smokes I didn't realize the 1.8 intake manifold is so huge! Well compared to the 1.4 at least.
GM Inside News Forum - Engine Guide
Stew
Sedans Rule!
I'm officially a member of the club now, yay! And while I was in there I also ground the screws flush in the throttle body, and smoothed out just behind the TB in the intake manifold. Haven't got it all back together yet, soon though.
And like everyone is saying, getting the intake manifold out is pretty straight forward, if you can do brakes and for sure if you've done a timing belt you'll do fine.
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Edit for follow-up report: All went back together without issue, car started up and ran perfect with no codes being thrown, my car is not tuned. Other observations were my throttle body was dry as a bone but like others there was a little oil in the intake.
After making sure everything ran fine I got under the car and wiped off the back of the engine where some of the oil from the intake manifold dripped and I re zip-tied the ones I cut to move wire harnesses out of the way. If you cut the molded in zip-tie off the base that presses into the hole you can fit new zip-ties on to them for a very factory look. And believe it or not the heater hose and wire harness you'll have to re zip-tie to the back underside of the manifold is really easy to get to from under the car.
And like everyone is saying, getting the intake manifold out is pretty straight forward, if you can do brakes and for sure if you've done a timing belt you'll do fine.
------------------------------------------------------------------
Edit for follow-up report: All went back together without issue, car started up and ran perfect with no codes being thrown, my car is not tuned. Other observations were my throttle body was dry as a bone but like others there was a little oil in the intake.
After making sure everything ran fine I got under the car and wiped off the back of the engine where some of the oil from the intake manifold dripped and I re zip-tied the ones I cut to move wire harnesses out of the way. If you cut the molded in zip-tie off the base that presses into the hole you can fit new zip-ties on to them for a very factory look. And believe it or not the heater hose and wire harness you'll have to re zip-tie to the back underside of the manifold is really easy to get to from under the car.
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Oh come on. You gotta start it 4 hours before work, in the dark, with limited intructions if you want to keep your mancard
Not once, but twice have I done this, once on a buddy's car and when I was walking into his house after finishing he was stepping out to leave for work, and the other time I didn't have time to take a shower before work after 6 1/2 hours of working through the night on my truck.
Stew
Sedans Rule!
Are you talking about one of the nylon zip ties? There's two back there that are a pain, one on a heater hose and one on a wire harness. Just carefully cut them, leave the base of the zip tie pressed in and later when you're neatly putting everything together you can fit new zip ties on the base.
If you're talking about an electrical connector, every one of them has a tab you have to press to release it; look carefully, some connectors have a lock tab to release an internal part of the connector on the back side which keeps the pins nice and stable so look on the other side of the connector.
Edit: also after you grind off the tumblers stick your finger about a half inch or so further in the intake manifold port and you'll feel a rough plastic seam that you should also smooth out.
If you're talking about an electrical connector, every one of them has a tab you have to press to release it; look carefully, some connectors have a lock tab to release an internal part of the connector on the back side which keeps the pins nice and stable so look on the other side of the connector.
Edit: also after you grind off the tumblers stick your finger about a half inch or so further in the intake manifold port and you'll feel a rough plastic seam that you should also smooth out.
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