no boost, no power, no pull. HELP !

[InCoGNiTo]

sup guys
my car has been acting funny for the last while and I cant figure it out, hopefully someone can give me some advise on what to check or what to fix. let me explain.

a while back, I noticed my car not making full boost, it always made 15psi according to the gauge, it use to hit it and hold it nicely.
lately, its been hitting 12 psi and dropping off to 10psi.
it always makes atleast 10psi, always holds atleats 10psi, but like i said, sometimes it will hit and hold 12, others it will hit 13 and drop off to 10.
and sometimes, the gauges reads 10-12psi but the car barley moves.
everything sounds normal, but the car wont pull, its showing its making the boost, and you can hear the "spool" but the hesitation is ridiculous, its as if something was holding it back.
sometimes when it gets really bad, I let completly off the gas and go back on it and the car seems to work better, it still only makes the 10 or 12psi, but it doesn't lag and sit there as much. its hard to explain.

so far i've changed, plugs, wires and downpipe.
still getting the same results, I also took the inlet pipe off the turbo and checked it out, no visible signs or damage there, no play.
i've checked for leaks and breaks in any piping. only thing I did not test that I could get at was the intercooler, I plan to test that out this weekend.

theres no funny noises, no vibrations, no nothing, the car seems to be the same way it was, with the exception of the not enough boost.
I don't know how big a difference 3-5psi makes but to me the car is "gutless", it doesn't seem to have near the pull it used to.

what can I check ? what could cause this ? anyone have a similar problem before ?

 

[InCoGNiTo]

anyone ? any suggestions or info would be great

 

[jott5555]

mabey a boost leak? have you done a intake leak test as shown in the vfaq?

http://www.vfaq.com/mods/ICtester.html


you could be getting unmetered air into your engine causeing the hesitation..

 

[Anomoly#5]

what mod's do you have?

 

[InCoGNiTo]

what mod's do you have?

Bone stock :thumbdown


So far Ive checked for leaks in the intercooler and pipeing, all looks good there.
Did a very close inspection on just about everything under the hood and everything looks ok.
Still cant figure this out, i dont know what to do or to check for

 

[x camaro owner]

have you tested the pressure the bov releases at.

you also say it is bone stock then how are you getting 15 psi of boost.

last time i checked stock eclipse were about 7-8 psi

 

[blackGSX2g]

Yea, like X Camaro said, check the BOV. My stock 2g BOV held till about 13psi, then nothing beyond that at all. I tried tried turning up the boost controller and was dumbfounded as to why it wouldn't go up (in my less experienced days), then got my 1g BOV and it fixed everything. Hook a vaccuum pump to the upper nipple of the BOV and see what kind of HGs it'll take. Those cheap springs go bad pretty easily.

 

[InCoGNiTo]

ok, heres an update.
checked for leaks in piping, intercooler, intake mani and exhaust mani, nothing, all is good there.
Had some exhaust work done after this started to happen, Got a new flex pipe and I removed my Converter.
Its been about 2 weeks sence I got the exhaust fixed.
Still not working right, made about 12psi then dropped off to 10, not near the power/boost it use to make.
So, last night im driving, 3rd hear rpms at about 3000 and Bang, Check engine light pops on.
I figured it because of the missing cat.
So I figure the talon would be like most other cars and by "unhooking" the battery you can reset the ECU and clear the codes, so this is what I did, let it sit for about 10 minutes before attaching the batter cable again.
So I fire the car up, check engine light is gone, thats one bonus, and hasnt come back on sence.
even more odd to me, according to my boost gauge im Making and holding 13psi.
I tried a few times and it hit and held it with no probs, engine sounds nicer while under boost and seems to have a lil more pull, to me its still Not the same as when I first got the car, but more then what I had non the less.

How and Why can resetting my ECU make me gain and hold 3 psi more then before ? it makes no sence to me ?

something messed up ? just a wild fluke ?

I also checked for shaft play back when I was in test mode, theres was minor side to side, no in and out.
I dont think its enough to hurt anything bacuse it seemed like a tiny amount of play to me.

thats my update. any ideas ? suggestions ?


ok, update #2

My problem came back, now worse then ever, it will not pass 10psi on the gauge, car feels slow, not near the pull, no matter the rpm it wont pass 10psi.
So, I was bored today and decided to vent to the asmophere for a few minutes by removing that recirc pipe, now, with doing this I decided to give the car a little run on the highway, by doing this I hit 13 psi, now at this point im stumped, so I took the car home, re attached the recirc pipe and "un vented" and the car is back to 10psi.

I must add that when I was venting it hit 10psi like it always did for the last while, then as I got up in the rpm's it jumped over to 13psi in a hurry and there was a noticable differnce in pickup, best I can discribe is it hit 10psi and held it, then as the rev's got higher, Im thinking around 4500-5000 the gauge moved itself from 10 to 13 in a hurry, it was a very fast change on the gauge from 10-13psi, faster then ive seen the gauge move before, its was as if I went from 3 cylinders to 4 (expression), it was an instant jump on the boost gauge and an instant jump in the pull of the car. very noticable. it pulled better and even sounded better.
I was focusing watching the boost gauge so im not to sure about where the revs were, from a quick glance I seen a little under 5000rpm.


now, I must point out that even when the car hit 13psi it still didnt feel right, still nothing near the pull the car used to have or it should have in my opinion.

The last comment I got from a mechanic was I might have a dead injector and or its not spraying the way it should be, thoughts on that ?
thoughts on the psi jump while venting ?

This problem is really starting to bother me

 

[psidtsi]

I didn't read all the replies, but I read the main thread. Did you check the wastegate actuator? I had the same problem with a 1g, changed that, right back to normal.

 

[mitch83]

I'm having the same problem only I have an intake and MBC use to jump to 15 and hold pretty good and damn near almost put me back in the seat. I took it to the races one weekend and did hella good man I pulled on an SR20 powerd 240 that was running a 20g only by a fender but damn was I happy. Well I take it out the following weekend and it's feeling a little week well I take it to the races again and get beat by a whole car by a GST from a 2nd gear roll he says he has a 6-bolt swap but has a T-25 and all 2g stuff like manifold and intake manifold and TB so it just would not go like it use to and it makes this horrible vibrating sound in the upper RPM range now like the exhaust is rattleing out of control or somthing it's coming from the right rear side of the engine bay so I dont know but I'm pissed just like you are.
mitch

 

[Towlieee]

Blown turbo?
My boy ran stock setup on his 91laser turbo runnin 18psi for a couple months..

After a long time one day it started spooling to 10psi.. Then later it woudlen't spool at all..

Ended up the turbo had like a cm of shaft play, a bunch of the fins were bent, and the exaust side had a crack in it..

 

[SummerWolf]

turbo damage :thumbdown or a small but constant boost leak.....time to upgrade....50 trim, hard intercooler piping, 1g bov, and an fmic :laugh: hope you figure it out man