back fire

[geno414]

hello every one.
i have a problem with my 2g dsm.
when i take it up to about 5k i get a back fire or a bang as you could say and i thought it was a boost leak but now i really dont know what it is.
my gage says 25psi on it my boost controler is set as low as i can get it i only want to run about 15 psi but it wont go down. and i thought it was a fuel cut but i really dont know what it is i have tryed lots of stuff but im clue less will sombody help?

 

[scott90gsx420]

hello every one.
i have a problem with my 2g dsm.
when i take it up to about 5k i get a back fire or a bang as you could say and i thought it was a boost leak but now i really dont know what it is.
my gage says 25psi on it my boost controler is set as low as i can get it i only want to run about 15 psi but it wont go down. and i thought it was a fuel cut but i really dont know what it is i have tryed lots of stuff but im clue less will sombody help?

Well have you done a boost leak check to be sure thats not what it is. What are your mods? Shed some light on your fuel mods? If it is all thats on your profile then you need to remove that Manual boost controller and run it directly to the wastegate, then if your boost is still above 14psi id remove that turbo and put the stocker back on until you have proper fuel mods to keep up with it. You cant just throw a bigger turbo on your car and expect to run 20psi on a stock car. I was originally going to say it was due to running rich but as it looks like you have no fuel mods, its from running way way to lean. Keep running it like that and youll be buying a new motor.
If you have fuel mods what are they? And do you have a way to tune it?

 

[EvoInside]

hello every one.
i have a problem with my 2g dsm.
when i take it up to about 5k i get a back fire or a bang as you could say and i thought it was a boost leak but now i really dont know what it is.
my gage says 25psi on it my boost controler is set as low as i can get it i only want to run about 15 psi but it wont go down. and i thought it was a fuel cut but i really dont know what it is i have tryed lots of stuff but im clue less will sombody help?

What type of turbo does the car have? What type of wastegate?

 

[scott90gsx420]

What type of turbo does the car have? What type of wastegate?

Its on his profile. He is running a B16g at 25 psi WITHOUT supporting mods

 

[Quicksilver1695]

no supporting mods is bad news bears. Is the MBC installed backwards?

 

[geno414]

i bought a car with a 16g on it i have a fmic intake boost controler headers full 3" from headers back i really dont know what it is i did a boost leak test and the only boost leak i have is from my bov the last owner of my car put the turbo on he had a shop do it i have no fuel mods done to it at all or what i know of if theres anything you need to know about my car i can tell you just ask

i dont want to run 25psi i want to run 15 thats why i put the boost controler on it and turned it all the way down but its still at 15psi and still gets that back fire

no supporting mods is bad news bears. Is the MBC installed backwards?

i tryed both ways and nether of the ways work

 

[scott90gsx420]

Is it a bleeder type MBC? IF so i have the same type. I had to open mine a bunch to get it to reduce boost mine kept hitting like 30 and would keep going? So If you don't have fuel mods and cant go back to stock do not boost it. Your asking for trouble if you do. So your saying with the MBC removed and the line hooked straight to the waste gate you still get 25? That sounds like a sticky waste-gate actuator or that the dump hole isn't big enough which is pretty common with the 16g turbos, and even worse with the evo3 16g's. If your running the stock 2g BOV then go buy a 1g BOV and do the crush mod if it isnt already done, then swap them out the 1g BOV are a lot better then the crappy plastic ones 2g's have. And even with the recirc. tube on my Blow off is still pretty loud.

 

[96awd]

Proper grammar and punctuation would be cool too!

I'm going with a stuck wastegate actuator as well. With the MBC off, you should be running wastegate pressure which sure in the hell isn't 25psi.

 

[empie1]

i bought a car with a 16g on it i have a fmic intake boost controler headers full 3" from headers back i really dont know what it is i did a boost leak test and the only boost leak i have is from my bov the last owner of my car put the turbo on he had a shop do it i have no fuel mods done to it at all or what i know of if theres anything you need to know about my car i can tell you just ask

i dont want to run 25psi i want to run 15 thats why i put the boost controler on it and turned it all the way down but its still at 15psi and still gets that back fire


i tryed both ways and nether of the ways work

So how about you ditch the mbc and just connect right to the wastegate? If you still have crazy boost, than you know its the wastegate not opening. Dont keep driving it like that.

 

[geno414]

all my mods r thes i have gready blow off valve fmic. headers. full 3" all way back o2 houseing is open for wast gate all ic piping i think its cammemd not shure short thro shifter intake and 16g evo turbo i never had this problem before and i dont know what happened and dont know how to fix it i was thinking it was a fuel cut becaseu fuel i think cuts off at 20psi and its hitting 25 and i dont even want to boost that hi i only want 15 psi i was thinking a fuel presser reg but i dont know if that will fix it to be honest thats why im posting

So how about you ditch the mbc and just connect right to the wastegate? If you still have crazy boost, than you know its the wastegate not opening. Dont keep driving it like that.

ok well if it is that then how will i fix it?

Proper grammar and punctuation would be cool too!

I'm going with a stuck wastegate actuator as well. With the MBC off, you should be running wastegate pressure which sure in the hell isn't 25psi.

yes the mbc is off so how will i fix the problem then? im clueless ha

 

[scott90gsx420]

As for the boost levels off just the waste-gate your totally right when i was trying to diagnose my issues just like this(except my boost would just keep going and going) i pulled the MBC off and went straight to the waste-gate and only hit like 10 or so. Then i decided to open the MBC up couple turns and walla haven't had any issues with it since i don't even get boost creep.
And if you are still hitting that high off boost with the MBC off take a pair off pliers and see if the waste-gate is really sticky. It will have resistance but it will move, or if you have access to a air compressor hook it up to the line from the waste-gate and slowly add air until it opens. If its anything above 10 or 11 the waste-gate actuator is stuck. If it opens when its suppose to then its the waste-gate itself and will need to be ported. Simple fix untill you can fix it properly. 1 is don't drive the car if you can. 2 is if you have to drive, do not boost it

 

[geno414]

im just a 17 year old kid trying to fix my car i have no help from any of my family or anything i bought the car not running and i did all this by my self so far i just need some help some things i know and others i dont ya im a noob but i love dsm cars and its my dream car

 

[empie1]

im just a 17 year old kid trying to fix my car i have no help from any of my family or anything i bought the car not running and i did all this by my self so far i just need some help some things i know and others i dont ya im a noob but i love dsm cars and its my dream car

You fix it by replacing the wastegate actuator.

 

[geno414]

I hope your not talking to me about the proper grammar and stuff.
As for the boost levels off just the waste-gate your totally right when i was trying to diagnose my issues just like this(except my boost would just keep going and going) i pulled the MBC off and went straight to the waste-gate and only hit like 10 or so. Then i decided to open the MBC up couple turns and walla haven't had any issues with it since i don't even get boost creep.
And if you are still hitting that high off boost with the MBC off take a pair off pliers and see if the waste-gate is really sticky. It will have resistance but it will move, or if you have access to a air compressor hook it up to the line from the waste-gate and slowly add air until it opens. If its anything above 10 or 11 the waste-gate actuator is stuck. If it opens when its suppose to then its the waste-gate itself and will need to be ported. Simple fix untill you can fix it properly. 1 is don't drive the car if you can. 2 is if you have to drive, do not boost it

no he was telling me because i cant spell for anything .. so i should just take the mbc off then what?

I hope your not talking to me about the proper grammar and stuff.
As for the boost levels off just the waste-gate your totally right when i was trying to diagnose my issues just like this(except my boost would just keep going and going) i pulled the MBC off and went straight to the waste-gate and only hit like 10 or so. Then i decided to open the MBC up couple turns and walla haven't had any issues with it since i don't even get boost creep.
And if you are still hitting that high off boost with the MBC off take a pair off pliers and see if the waste-gate is really sticky. It will have resistance but it will move, or if you have access to a air compressor hook it up to the line from the waste-gate and slowly add air until it opens. If its anything above 10 or 11 the waste-gate actuator is stuck. If it opens when its suppose to then its the waste-gate itself and will need to be ported. Simple fix untill you can fix it properly. 1 is don't drive the car if you can. 2 is if you have to drive, do not boost it

i know this is asking for a lot but can you show me some pics of the porting?

 

[empie1]

For the last time...remove the mbc and just connect the wastegate directly to the nipple on the housing (or where ever yours is). Dont worry about porting anything. That is not why you are boosting to 25 psi. You have a either a mbc or wastegate issue. Eliminating the mbc will tell you which it is. Porting is for curing boost creep. This is where once the wastegate opens at the specified psi, boost pressure slowly creeps higher and higher as a result of exhaust not being able to exit efficiently.

 

[geno414]

The guy up there said something about your grammar and punctuation. Id advise you listen to him or hell get you bumped(thats how people are on hear got to remember they all started working on there dsm's with all the know how in the world.) They didn't have to ask for help so they spent there time in English class instead of reading these forums. I personally don't see what the big deal is as long as its understandable who gives a S***. But its not my website i don't make the rules.)
Its all good dude we all have to start somewhere(unless you fit into the category above) just keep calm and don't get frustrated well get it fixed just read, read, and read some more. Then ask questions if your still confused. Also if you didn't read my last post(we posted about the same time) then read it theres some troubleshooting ideas for you on it.

allright thank you so much i actully think it is what you are talking about. with the
wastegate actuator but i don't understand were porting come's into play or were to do it. i have been reading and reading i'm starting to think i will never find it.

 

[jwahl16]

allright thank you so much i actully think it is what you are talking about. with the
wastegate actuator but i don't understand were porting come's into play or were to do it. i have been reading and reading i'm starting to think i will never find it.

Well first test the waste gate like he said. Hook up an air compressor to it and see at what psi it opens. If it needs porting you will end up taking the turbo off and porting the waste gate opening to increase airflow out of the turbo. That is usually necessary if you are experiencing boost creep. Just try the things that have been suggested first, and keep reading.

 

[geno414]

sorry every one for spelling wrong i was just trying to get my car fixed no need to report me for it i didn't mean any harm

Well first test the waste gate like he said. Hook up an air compressor to it and see at what psi it opens. If it needs porting you will end up taking the turbo off and porting the waste gate opening to increase airflow out of the turbo. That is usually necessary if you are experiencing boost creep. Just try the things that have been suggested first, and keep reading.

allright thank you