idle problem (hm im pics!)
 

i just installed my new homemade intake manifold (pics later) and throttle body that i bored out from 58mm to 63.5mm and i have an idle problem. it used to idle at about 1100rpm, now it is 2200rpm even after warming up! there is no vac leak, infact i am getting 22 in/hg of vac at idle, whereas with the stock setup i was getting 21 in/hg of vac at idle. i checked the tps and it is set up properly reading .4ohms at closed and 5.0 at wot. i am pretty sure that it is a tb problem because i tried to install the overbored tb on the stock im before and had the same problem. my fuel pressure is set correctly and my oil pressure is now always around 60psi because of the high idle. i tried adjusting the idle adjustment screw all the way in and it doesn't seem to make a difference. why would i get such a high idle without a vac leak somewhere? any help would be greatly appreciated.

Re:idle problem
 

Don't take offence, but I ask this only because I don't know what you know about machining etc. You did make a larger butterfly to fit the newly bored throttlebody right? Might as well get the simple questions out of the way first :P

Re:idle problem
 

yes. if it didn't fit properly i probably wouldn't draw more vacuum than when i had the original tb on right?

Re:idle problem (now pics)
 

here are some pics of my homemade im.

http://www.villagephotos.com/pubbrow...elected=823546

Re:idle problem (hm im pics!)
 

hmm...thats a tasty IM you fix the problem yet?

Re:idle problem (hm im pics!)
 

maybe u got a vacuam leak somewhere. the welds dont loook lik they hold up all that great. heh the whole peice look nice but the welds look like ---- man

Re:idle problem (hm im pics!)
 

they look a little thick, but I don't know about "looking like ----" 8) that's a little harsh

Re:idle problem (hm im pics!)
 

Have you bored a throttle before. What did you use to make the new plate. I'm assuming you used a lathe? i would take the throttle body off and drop some water into the base of the plate if it leaks onto the other side you have your problem.

Re:idle problem (hm im pics!)
 

They look a little thick, but not like ----. Welding aluminum takes alot of skill. I think it turned out nice. Looks like you have alot of nice tools at your dispose. And a nice welder too!

Re:idle problem (hm im pics!)
 

i am pretty sure the leak is the butterfly valve not sealing off properly. i can't see it being anything else. i've uploaded some more pics and you can see where i got a little aggressive when i was boring it out and had to fill a hole with some jb weld, hmt style! i just ran the bore again after patching it up and it looked fine!

i'd say they aren't too bad for only having had one lesson. welding aluminum is a lot different than welding steel. perhaps you could show me some of your aluminum welding, ya know, how it should look? or maybe we could do an educational trade off... you could show me how to weld properly and i could teach you how to spell.

Re:idle problem (hm im pics!)
 

teach me how to spell ehh? ever heard of a typo? dont post pics of something if u dont want it to be commented about. i was just telling u the welds look like ----. im sure anyone could tell you that. and sorry i dont have pics of me welding aluminum. never done it before. but ive done some sheetmetal in my welding class. and no i dont have pics of that.

Re:idle problem (hm im pics!)
 

you need to eat a big can of "shut the hell up". sure, make comments, make crappy ones... but have something to back it up with. sheet metal and aluminum are worlds apart as far as welding. if you have no experience with something it is pretty lame to be critical of someone else's work. i'm sure anyone could tell you that. perhaps provide some constructive criticism.

Re:idle problem (hm im pics!)
 

u can tell something is ugly by looking at it. some of the welds look good. but in some spots. looks like there could be pin holes in the weld. thus causing a vac. leak. u said u had a vac leak somewhere and i was just saying that maybe your welds have pin holes somewhere. and u had to go all crazy.

Re:idle problem (hm im pics!)
 

hey man, i'm just defending myself. trust me, there are no pin holes in those welds. it'd have to be a pretty big pin hole to make the idle jump a 1000rpm. but seriously, you really do need to back up your statements if you are going to talk smack like that. otherwise you're just a punk kid with his head so far up your own ass when you start to talk only ---- comes out.

Re:idle problem (hm im pics!)
 

Looks pretty good IMO. I too would have to agree that the butterfly possibly isn't making a good seal at idle and allowing more air than necessary to flow by, resulting in a higher idle. How about the idle air screw? Have you tried to lower it adjusting that?

Re:idle problem (hm im pics!)
 

Oh c'mon, you two start fighting again. Its been my entertainment for the hour

Re:idle problem (hm im pics!)
 

theres a little screw where the butterfly is adjust it so it closes further. that might fix your problem its like uses an allen wrenche to adjust it. theres a 8 mm locking nut. or check your throttle cable. u might have tightened it too much. i really never read your first post. if there was a vac leak your idle would just up and down. that was actually my bad. im not here to start anything. and dont be calling me a punk kid. but im guessing your throttle cable is too tight

Re:idle problem (hm im pics!)
 

i accept your apology. thankyou for your helpful insights but i set the tb up properly before i installed it. the cable wasn't too tight although i could see that as being a cause of high idle. i took it out and put the stock one back on. it seems to be a little sticky when closing- a result of poor fitting. it has a hard time closing all the way unless it is helped a bit with an extra push. i am going to try fitting the butterfly valve a bit better, or perhaps make a new one. i also tried the idle adjustment screw as mentioned by tranceminister but it didn't seem to make a difference when i turned it all the way in.

Re:idle problem (hm im pics!)
 

use the old school vacuum leak test, get a spray bottle fille it with watter and spray down the manifold and if the idle dips there is a leak

Re:idle problem (now pics)
 

how much would one of those go for, for a b16a?

Re:idle problem (now pics)
 

i'd make you one for $750 US or $900 CDN. i may have a website soon hopefully. i know it is actually probably on the real pricey side, but there is a bit more work involved in mine as opposed to the venom or str style. i incorporate the iacv into my design. also i don't want to be getting requests from tons of people because i wouldn't have time to make a whole lot of them right now. i'd recommend picking up an edlebrock. they are pretty reasonably priced i believe.

Re:idle problem (hm im pics!)
 

Dyno tested to be better? Without dyno results i wouldnt pay that much for one just cause it looks better then stock