Ok so I replaced all my vaccume lines with silicone hoses, new fuel lines, emissions removed, ac removed, ps removed, got myself a RB downpipe and cat replacement pipe, stock catback, and did the TB mod. I have a FCD on the way here, and I was planning on getting it on the wideband then driving it like that until I get my Haltech in May.What happened was me, BigTurbo74, and 1Revvin7 had everything back together and she started right up, but was ideling a little high at 1500rpm's, so we took starter fluid to it to try and find a vaccume leak, no luck. We decided to take the uim back off and check around all over. Found a couple things I forgot to cap off, but while it was off we decided to go ahead and do the TB mod for shits. I now have it bypassed so no coolant is runnning to the tb. Just got everything back together and started it up, as soon as it starts it revs up to about 6k and my boost gauge shows 10psi all vaccume and I have to shut the car off right away. Any thoughts or help would be greatly appreciated, and Brad maybe if you see this thread you could come over and take a look. https://www.nopistons.com/forums/pub...IR#>/blink.png



Brandon

This is with the throttle cable off the car. I think either something under there is keeping the throttle stuck open or you guys did something wrong on the tb mod. We should have kept playing with it. Eh maybe I will just come out again tommorrow https://www.nopistons.com/forums/pub...IR#>/smile.png

TB mod did not go right. Just like a carbereutor(spelling). Mess with that screw, you are revving up to 3000rpm on start up. But 6000rpm on start up would scare me.

sweet. I don't know what could have gone wrong on the TB mod. It was pretty easy, I mean unscrew the plates, pull the pin, JB WELD the holes, and walla, unless one of those holes arn't JB welded good enough. It's possible one is leaking cuz the stupid **** dripped when it was drying, ended up not being nice and smooth like i wanted, but I'm pretty sure it was sealed through and through.

ok so I found that the throotle was being held open cuz it was caught on an extra little bracket I neglected to take off the TB. Now thats all fixed. Still having some problems though. Now when I turn the car on it gradually climbs to about 4k rpms and shows 20psi vaccume on my boost gauge. I took off the front of the throttle body and the plates are closed now and the rest looks totally fine, so I dont think its got anything to do with the TB. Could the absence of coolant to the TB be making it idle high or maybe I need to just adjust the idle. I just dont want to adjust it if there really is a problem somewhere. I've checked and double checked all vaccume lines and this is now driving me crazy!

You forgot to take off the fast idle cam...

Dont listen to 1Revvin7 he tried putting low compression pistons in my 13b......lol...

https://www.nopistons.com/forums/pub...R#>/violin.gif

Took the fast idle cam off. Has to be some huge vaccume leak somewhere, or maybe the TPS needs to be adjusted, but I don't think you can adjust the idle down from 4k with the TPS (just for fine tuning).

did you leave the thermowax on?

nope we took that off. we didn't touch any other idle adjustment screws but he has yet to reset his tps. but would the s5 tps system make it idle that high if it was mis-calibrated? i'm thinking some hidden leaks still have to be serviced

sounds like the fast idle cam to me. When mine was idling at 1500 or so I couldn't figure it out either. Apparently when I rebuilt the engine I somehow messed up the fast idle cam. I never touched the damned thing but somehow it got messed with. and you are positive that the throttle plaes are fully closing even with the throttle cable hooked up?

reread the thread, yes we took it out, and the plates are closed https://www.nopistons.com/forums/pub...1047683664.gif

lol I know, Its just I went through the same crap about a week ago. Gotta be a leak somewhere though....

yeah I took the uim back off, double checked all vaccume lines, double checked everything on the TB mod and its all good. made sure evrything was clamped with metal clamps, then adjusted the TPS a little. Got it all put back together and it held a solid idle at about 950-1k. After about 3 minutes of solid idle it started surging up and down from 1k-1500-1k-1500 ect. I think its got to be the TPS. I'm going to work with that a little more and see if I can't get it to hold a steady idle. I don't believe there could be a vaccume leak, I have checked everything over and tightened everything down over and over again.

you say tou did the throttle body mod, did you happen to polish the area under the throttle plates themselves? you may have a little air leak there. Also check to make sure your o-ring between the TB and the elbow is still there...

Also a quick thought, is your recirculation valve open to the atmosphere? the stock BOV. If it is, put your hand over it and see if you have vacuum pulling on your palm... they are not the best pieces of plastic...and commonly over looked when troubleshooting.

Hes got a blizt unit open vented. But the thing is the car was FINE before he dove in. https://www.nopistons.com/forums/pub...DIR#>/wink.png

Ok so Now the car is still surging. It starts up and holds a solid idol at about 1k, then after a few seconds it will drop to about 800 and jump up and down constantly from 800 to 1500. 1Revvin7 and myself have inspected all work done on the TB mod and everything looks good, I have clamped every single vaccume line and hose on the motor, and have went gunhoe with starter fluid and havn't been able to find any leaks. We also adjusted the TPS to spec today, and still no help. This is driving me crazy!!! https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif https://www.nopistons.com/forums/pub...1047683358.gif

I kinda still have this problem. I KNOW it isn't a vac leak and i have isolated many electrical things. I know its got to be either tps or something electrical in the emissions system for me. Seeing as you have removed all emissions that narows it down quite a bit. Try unplugging the tps and see what happens. my idle drops about 300 rpm when I unplug mine and it just idles that much better. Try that and see what happens.

Well whats so strange is it idles steady for a different intervals, 5-25secs, then goes surging. I cannot figure this out. We need to decifer the codes the ecu is giving off.

the s5 ecu needs to idle in a certain rpm range, other wise it will go hunting for the right range. you need to set it to the spec idle speed

hrmm ok mikey, but he backed the throttle stop off all the way. Won't idle any lower.

Yeah I just don't know anymore, I wen crazy with that starter fluid and couldn't find anything. I think the TB mod is just making it all messed up. It idled steady at 1500 before we did the TB mod, and we found a vaccume nipple that didnt get capped which was probly the leak that was causing the slightly high idle before. Then we did the TB mod and it won't even idle steady.

OMG so crunk with BigTurbo74 and 1Revvin7 we screwed up we been drnkn beer and takn shots like carzy whoa and now we gunna go figur

e ou6 my idle aND **** DUDE sweet! my ecu sucks I hate stock ecu and I hate stoc TID and stock SUCKS! I want my HJaktech now!

https://www.nopistons.com/forums/pub...IR#>/bigok.gif Another fun filled night at your house drinking with all the motor heads.

ok so i let the car warm up all the way to see if it ould stop surging once warm, but instead this weird ass noise that I have never heard before started. Every time the car would rev up on its surges a noise like a telephone ring when your calling someone started coming out of my intake. It was very electronic sounding, but I have no idea what could have been making the noise. Almost like a electronic bird chirping every rev. Has anyone ever heard this noise before??? I'm going to drive it this weekend when i get my tires and see how it runs, but it sure would be nice to have it idle steady. I have some pics of the TB mod so I'll post those as well as some motor pics.

TB mod throttle side

numbah 2

motor 1

motor 2