Confusing Issue/s

[Mattheww044]

Hey guys I have a few small things that are confusing me ATM. I guess ill start off saying before I swapped my TD04, i would have this very strange problem. I would start the car up, and sometimes it would just run like crap, sound like crap, read a vac leak, and NOT let me hit boost, as soon as I hit boost, it cuts out like fuel cut, but it doesn't stop. ( this seemed to have happened on warm or cold starts, just completely random). The strange thing is, after driving around for 15 minutes or so, it would return to running like normal and let me boost fine, runs fine, etc.

The codes that came up were: BCS and IAC

So, I swapped my turbo, and while I was under there, took out the IAC and sprayed carb cleaner in it, flushing out a bunch of black stuff. So, I got the turbo installed and all is well. So I decided to go back to stock boost management instead of my hallman MBC for now. (until I get my FCD installed). So i guess my first question would be, which line off of the BCS goes to the turbo nipple, and which goes to the wastegate?
Second of all it is still doing the CEL thing and not letting me boost while running like crap. Except now it wont go away. It did it this morning on the way to work, on the way back to work, and all around town running errands. The cel stays on, the car runs like crap, and I can't hit boost at all.

And finally, after installing my TD04, the car actually seems slower. After I first did the swap, it wasn't doing this stupid CEL crap and actually let the car run fine and boost. But the car boosted fine according to the gauge, but just wasn't nearly as fast as before......

The only things I could think of would be a boost leak, but it doesnt seem to drastically drop boost or anything according to the gauge, etc. or my silicone 90 is being squished by the manifold and possibly restricting flow. What do you guys think.

Again:
For the stock BCS, which line(top, bottom) goes to which nipple on the turbo (turbo or wastegate)?
Any ideas what the hell is going on with the CEL/no boost issue?
Why would my car be noticably slower after putting a bigger turbo on?

Thanks in advance!

[brweber352]

Top of BCS goes to Turbo nipple, next one down goes to wastegate, very bottom one goes to the intake(black box/ coffee cup mod area). I'll have to think alil before helping with the rest.

Brian

[Mattheww044]

ok well that helps for now haha. thanks. and last night the CEL was off almost the rest of the night, after being on and not going away all day long. I dont get it. But considering the codes are BCS and IAC, ill replace the BCS and see if it keeps happening, and if so buy a new IAC

[skid542]

I have an IAC you're welcome to try. I'll throw it in with those struts. It worked fine best I could tell when I had it but I haven't run it recently. But it's at least free .

I also have a spare BCS that I'll never use. It's missing the connector (it's the one from the Radio Flyer) but you can have it too.

Are you getting any MAP sensor errors? If the MAP sensor fails then it'll fuel cut right as soon as it goes from vacuum to pressure. That's what was happing on the Radio Flyer and what Gabe fixed.

Is this related to the other issue you are having by chance?

[Mattheww044]

ahhhhh that makes sense. I am not getting any other CEL codes except the IAC and BCS last time I checked. I really appreciate you throwing in the parts. I am buying a BCS from another member and I don't wanna go back on my word, but ill take the IAC. If those 2 don't fix the problem, then I might as well try a Map sensor as well. Its basically the same issue as the radio flyer had (completely random, no boost), but i dont recall the radio flyer idling like absolute crap when it did that, it just randomly wouldnt hit boost, but I could be wrong. Anyways, Ill try replacing that 90, and give you a call friday to pick up the parts either frieday night or sometime during the weekend. Thanks alot Lee,
Matt