Car is bogging down, have no power at all past 3500 or at any positive boost level Options

[6gsillyca]

Took the vert out today, after firing it up for the first time last night, and am having some problems. I'm not sure wether it is rpm related or boost related, but at 3500-4000 rpm the car will bog down and not have ANY power what so ever, but the car also bogs down when the boost (gauge) goes positive. Since boost starts to kick in around 3500-4000 rpm i'm not sure which it is. Even when I downshift, I still cannot get the car past 3500 rpm. I can get going, but either need to keep under 3500 or under positive boost levels. The car drives fine until either of those points.

When i'm idleing I can get the car up to redline with no problems, but once I let off the gas, the rpm's shoot waay down, enough to stall it out. If I rev it then get off the gas slowly the car will idle fine at 1500 rpm (i need to adjust the tb, so thats why its idleing high..)

Could a vacuum line cause this. I had a bunch of things off over the winter, and could have possibly forgotten to reconnect one.

Anything I can do to see wether it is rpm related or boost related?


Help?

Thanks

[presure2]

sounds like a major boost leak.

[6gsillyca]

I will double check all the couplings/piping. If I can't find anything then maybe i'll see if one of my buddies still has his smoke machine...

Can someone with a 2nd gen 3's tell me what lines are supposed to be plugged in on the intake manifold? I have a few that are capped off, and i think one or two that are unconnected and uncapped...i'm going to double check right now though.

This post has been edited by 6gsillyca: May 26, 2007 - 11:12 PM

[lagos]

you shouldnt have anything uncapped.

[6gsillyca]

I checked over as best as I could, and the rear nipple (closest to the intake mani) is capped. Thats the only one I found that was capped. The one infront goes to the bov.

There is a nipple that looks as if it had something runing into it (it has a clamp) on the pass (t belt side) on the BACK on the manifold itself (the nipple is right next to the firewall, on t belt side, behind the brake booster line). What is that nipple for? That was the only one that wasnt capped/connected that I found.

Could it have sometihng ot do with the tvis? I'm not very understanding of that system/function yet, but doesn't/shouldn't it "open" at around 3500 rpm?



This post has been edited by 6gsillyca: May 27, 2007 - 2:37 AM

[6gsillyca]

Well I found my leak. (I hope...) One of the nuts for my bov flange came off, and made it loose. I didn't notice it at first because it was on the underside of the bov, and when I quickly checked it on the side of the road, it still seemed tight and secure. After the drive home, i noticed it was loose, and because the bov is so close to my tb I'm guessing thats how the small leak made such a big difference.

I threw a ziptie through the flange hole and tightened it down, took it for a spin, and it seemed to have cleared things up. When I cut the ziptie off, and loosened the bov, the problem came back.

Off to find another bolt/nut/set of washers tomorrow to secure it properly, and I guess we'll see if that was it for sure.

Thanks for all the help guys!

[normality78]

let us know what is the outcome after you fix change it

[6gsillyca]

It was the BOV. tightened it down and she boosts beautifully now.

Not related, but for some reason I dont seem to be running as rich as I was last year. Before I parked it, when I would idle, I would spit black drops out the back. Anywhere I idle'd I would leave a little spray of gas just behind the muffler. I would also blow a huge cloud of black/gray smoke out of the tailpipe on heavy boost (as in the vid jay has posted of his autox)

Now I can idle with no spitting, and under any boost (high boost, heavy load) i have no cloud of smoke, except for when I shift, but I have the bov vented right now, so thats probably why...and when I first started it up this year, for the first 10 mins of idle I made a spray, but then it stopped.

I'm trying to get a dyno done sometime soon, so I can make sure i'm not leaning out anywhere, and am trying to keep the boosting down (as much as I can) but I just find it interesting how I "leaned" up over winter. Only thing I changed was the csits, water temp sensor, plugs, wires (except coil wire) and cap...