Well first of im not sure if this is the right place to post this, but i am boosted so i did this here.
Let me say that i have been boosted for 3yrs running without any problems until last september. Here is what happened... From what i remember from this time...
Of course i was messing around, but a mile from home something happened...AHHH.. The car all of a sudden sounded like a effin race car super loud, sorta seemed like it idled super high. So i babied it home the rest of the mile, just barly hitting gas and letting it coast down the hills and around the corners to my driveway. Well i got it in my driveway, got out while it was still running real fast, nothign was smoking, no fluids leaking anywhere. But was just really loud and idleing fast. I have checked the oil, there is nothing mixed with it, i checked the plugs. Those seem to be fine, but a little black. Not smushed or anything no oil on those either.
Now this is all i can remember for the most part from when it happened. I want to go start it up and see what happenes and listen to it again so i can be exact on what it sounds like, but i am afraid to do that. Because i don't want to hurt anything more that what it already is, if anything. Im thinking im gonna do a compression test on it and start from there, but i was wondering what all you boost/engine gurus though!
2004 Turbo cavalier 11PSI and blown!
Sounds like you have a vacuum leak which is causing the high idle and maybe an exhaust leak aswell for the loudness. The only think I can think of that relates the two of those directly is the wastegate. Maybe blew the wastegate bladder? idk, but a vacuum leak could almost be anywhere, maybe brake booster line popped off? Anything strange with the brakes happened?
I can invision a situation where if a WG breaks in such a 1:1,000,000 chance you could end up with a vacuum leak(sucking in exhaust) and an exhaust leak all the same time which would give you the loud noise. Not too sure if that's really likely since the valve stem on WG's are relatively small....and at worst it would only be a crack in the housing so actually pulling enough air for high idle would not be likely.
Edited 3 time(s). Last edited Wednesday, May 20, 2009 12:11 PM
"Never argue with an idiot. They'll drag you down to their level, then beat you with experience!" -Anonymous
Yea i was gonna say check the connections off the downpipe, wastgate etc for the exhaust leak. Check all the vacuume connections on the TB. Check your IAC sensor on your tb. Start there.
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
^as stated above check every spot after the turbo (fmic,iat,bov diaphram,vaccum lines,charge lines). check the snap ring that holds the exhaust housing to the center section. check flapper door, wastegate diaphram, o2 sensor loose-o2 housing-o2gasket, downpipe gasket. if your throttlebody is sticking it could cause the waste gate to stay open.
what it sounds like is the wastegate is open, that would make for the dump truck sound and high idle.
Thanks everyone... I will be sure to check all this.
But i was talking with my GF earlier about this. And she reminded me that when all this happened not only did it idle high and be super loud, the RPMs were jumping up and down between 500 and maybe 1000 RPMs. As it was idleing high.
????????
2004 Turbo cavalier 11PSI and blown!
huh, it looks like you have the same turbo as me with that in mind. take off your o2 housing and look and see if anything is blocking the flapper door,(hope its not a piece of turbine fin or ring) check over your throttle body, use a tire air pump and check and see if your bov is working correctly same for the WG. do you vent to the atmosphere with the WG/BOV?check and verify that all your sensors are good but due to the loud sound id say it has to be mechanical.
The Boost Creep (ECOsleeper) wrote:huh, it looks like you have the same turbo as me with that in mind. take off your o2 housing and look and see if anything is blocking the flapper door,(hope its not a piece of turbine fin or ring) check over your throttle body, use a tire air pump and check and see if your bov is working correctly same for the WG. do you vent to the atmosphere with the WG/BOV?check and verify that all your sensors are good but due to the loud sound id say it has to be mechanical.
What do you mean by mechanical?
2004 Turbo cavalier 11PSI and blown!
by mechanical to the turbo system, i mean nothing to do with a sensor/fuel/spark/motor/intake mani. its something after the head, so that leaves manifold, turbo, ehxaust housing, center section, waste gate, o2 housing/downpipe, ALL charge lines, fmic, blow off valve, throttlebody. also maybe a sensor came loose and fell out.
Alrighty, i will be sure to check all this...
Could this possible be due to anything internal or in the head?
2004 Turbo cavalier 11PSI and blown!
a stuck valve or broken rocker maybe but i highly doubt it.
Well Yesterday i finally got around to messing around this... I took the turbo off checked everything at the turbo and header. Everything thing seems to be fine. All fins move freely nothing broken just the exhaust fans are really black.
Also yesterday i was cleaning up some tool boxes and found some older spark plugs that i changed last year before this mishap happened. Well i remember putting in this post my plugs were BLACK when i checked them and my older ones still looked like new... Now is it just me or does this seem like a problem. My plugs should not be black black.
When all this rain clears up, im gonna go out and check a few more things all the way to the TB.
Anymore input? Anyone?
2004 Turbo cavalier 11PSI and blown!
did you figure out your idle surging and such? I had the same thing on my car when i replaced my intake manifold and 1 damn bolt was a little loose. had a leak.
Lols.
daythecountrydied21 ok wrote:did you figure out your idle surging and such? I had the same thing on my car when i replaced my intake manifold and 1 damn bolt was a little loose. had a leak.
No i have not figured out what any problem was yet... I took off turbo and Piping the other day. Turbo seems to be fine, nothing blocking anything nothing broke. So I dunno...
For the ones who said to check the BOV and WastGate... How would one go about making sure these are working properly without starting the car, cuz they are off and won't be put back on just yet... I broke a bold to the hahn manifold that holds the turbo in place... OOps
2004 Turbo cavalier 11PSI and blown!
Ok soo i have what may be some good news....
I just went outside a few min ago to mess with the car before it rains here... put a new battery in it and fired it up. Let me tell you it sounds 100 times better (even tho there isn't and exhaust) than when this mishap happened and i drove it into the driveway. The RPMs are not jumping and its not even as loud now w/o the exhaust as it was when this first happened with the exhaust. So my guess it has something to do with the #1 Turbo #2 BOV #3 EBC (electronic boost controller)
Now my question is... What could these 3 things have done to make this happen?
2004 Turbo cavalier 11PSI and blown!
Put it back together put fresh plugs in it and start it up. If all is well take it for a normal drive. To me seems you are pussy footing around with it. If it was something internal then it is @!#$ anyway. You can't find a problem like this without running the car.
FU Tuning
^ebc failure possibly could have been triggering the bov or wastegate to accuate and dump most of your exhaust gases or a bad gasket at the turbo/o2 housing-head/mani-turbo/mani. use a tire air pump with a psi gauge and see how many lbs of air its taking to open/close the WG and BOV and see if thats correct with where your ebc is set at. sounds like you had a bad exhaust leak and now its gone... you must have resealed it when you took everything apart and put it back togather. did a large pressure spike ever occur to your notice?(a sudden jump in boost pressure10-15lbs difference) that could have torn or warped a gasket.
also you can check a MHI wastegate by pulling the rod out and covering the vaccumm line hole, if the rod stays out until you open the vac line then its good, if it doesnt then your diaphram is bad. if thats the case, get another stock WG and do the "peepers" mod(lets the wastegate fully open,by extending the valve bodies)[most stock internal wastegates only open 30-40% of the flapper door].
The Boost Creep (ECOsleeper) wrote:^ebc failure possibly could have been triggering the bov or wastegate to accuate and dump most of your exhaust gases or a bad gasket at the turbo/o2 housing-head/mani-turbo/mani. use a tire air pump with a psi gauge and see how many lbs of air its taking to open/close the WG and BOV and see if thats correct with where your ebc is set at. sounds like you had a bad exhaust leak and now its gone... you must have resealed it when you took everything apart and put it back togather. did a large pressure spike ever occur to your notice?(a sudden jump in boost pressure10-15lbs difference) that could have torn or warped a gasket.
Thanks...
I havn't put everything back together yet, but i will be sure to check all that when i put it back togeather. All the gaskets looked good that i took off, but i am gonna replace all of them just to make sure. I never noticed any pressure spike at all. I drove the car pretty much all spring and summer until this happened with no problems. running a steady 12.5 lbs boost.
Now when i check all that u mentioned above, i have to have everything all hooked up right?
2004 Turbo cavalier 11PSI and blown!
the wg and bov can be pressure tested without being installed. all your looking for when you pressure test is to see that the valve is manually working and that the diamphram is intact and not ripped and holds a constant pressure when accuated or not.
get a compressor or airtank and attach a adjustable pressure gauge to the end of the hose. then clamp a peice of hose around the gauges air outlet. attach the piece of hose to the wg vac line. turn on the air source and adjust at the gauge for 12.5lbs psi or just higher and see if the wastegate pushes the rod out and holds it there until you decrease the pressure. if so its good, if it doesnt push the rod out or the rod goes back in the diaphram is bad.
do the same with the bov, but keep the bov on the chargeline. with it still on the charge line hook a shopvac to one side of the charge line and seal the other side off. turn the shopvac on in the blow direction, then hook the piece of hose coming from the air source on the vac line on the bov and adjust to 12.5lbs or higher. if the bov is good and works correctly then the valve should open and expell all the air the shopvac is pumping in, if not and just a small amount of air escapes meaning there is a rip or tear in the diaphram.
Well i checked the WG with a compresser today... And it seems to hold pressure well, the rod stays out until i let of the trigger for the air pressure. So i guess that rules out the WG. I will check the BOV tomorrow.
Then i will just reinstall everyting, start the car and see what happens... Right now im guessing it probably somthing to do with the EBC but wont know untill i hook everything back up.
2004 Turbo cavalier 11PSI and blown!
Well i got everything put back together... Replaced all the vac lines fromt he turbo and BOV. Im gonna go get some oil do a oil change, then start her up. N, We will see what happens..
2004 Turbo cavalier 11PSI and blown!
Well i started it back up and..............
IT RUNS!!
I replaced the vac lines with new ones. So somewhere there must of been a vac leak. Now tho, i think there is somewhat of a boost leak somewhere. Reason is, it takes a sec or 2 to pickup boost or feel it kick in. But on the bright side, it runs. Tomorrow im gonna switch out plugs and put some newer ones in. OH, and another thing. The temp gauge says 195 when its warmed up, but when i pop the hood WOOOOSA it feels hoter. But maybe thats just me, from not messing with it in a while or it running. Im gonna have to drive it for a while to get the feel for how it was before and know if there is any more wrong.
2004 Turbo cavalier 11PSI and blown!
^^Man nice job on getting it together.
My water temp gauge reads at 180 because we HPtuned it that way. But yea when I open the hood its like I get smacked in the face with a heat blanket!! My turbo creates so much heat it's crazy, I know how you feel.
~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ
EcoEnvy wrote:Well i started it back up and..............
IT RUNS!!
I replaced the vac lines with new ones. So somewhere there must of been a vac leak. Now tho, i think there is somewhat of a boost leak somewhere. Reason is, it takes a sec or 2 to pickup boost or feel it kick in. But on the bright side, it runs. Tomorrow im gonna switch out plugs and put some newer ones in. OH, and another thing. The temp gauge says 195 when its warmed up, but when i pop the hood WOOOOSA it feels hoter. But maybe thats just me, from not messing with it in a while or it running. Im gonna have to drive it for a while to get the feel for how it was before and know if there is any more wrong.
Well i am retracting this last statement i said about it running...
It ran for about 70 miles then this incident happened again. I have been driving it all week on about 6 lbs of boost. Then all of a sudden today on my way home i just left my stop, started going shifted into second, barley got into boost then it all started all over again. Once again, it isn't throwing codes, nothing leaking, nothing mixed with the oil. But now i noticed that it is smoking from the turbo. After i shut the car off, the turbo sounds funny slowing down to stop.
Im wondering if all this has to do with the turbo itself, what is causing it i have no idea. Im going to take the turbo itself off again and start it back up and if it runs like last time w/o the turbo. Im ruling in TURBO itself as the problem.
Anyones input?
2004 Turbo cavalier 11PSI and blown!
