My car fart! help me diagnose problem?

[Kroze]

Well I'm going to ask this question again...hopefully someone knows what's wrong with the car.


- Everytime i press the gas pedal, instantly the car make a pssht sound.

- Everytime I let my foot off the gas pedal, instantly it make the same sound.

- The sound comes from underneath the car,

I don't know how to explain it but i'll try my best. The sound seem to be created as if there's a small hole in the downpipe and something is clogging it, and when enough pressure is build, it kinda "pop" and release the air but then quickly reseal itself again. hence the pop "pssh" sound every time.

If that's the case, what i don't get is, why does it do it when i let go of the gas pedal also.

I think it's from the exhaust because everytime it make the pssh/pop sound. my exhaust skip a beat...

it really bother me and it's embarrassing. driving around and the car keep popping and farting any suggestion on what's going on?

 

[FrustratedUser]

Maybe the previous owner was a ricer and installed a fake wastegate.

 

[BadNewsBears]

Im not too good with newer import more than one cam engines, but I will take a stab. Check all the flanges and connections in the exhaust with a cool engine and some water on the seams. If its leaking the water will spray around. Pull the downpipe and inspect. Cracked exh. manifold?

 

[Eli]

Exhaust leak.

Either that or a rattling heatshield or somesuch.

 

[Kroze]

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

what does that have to do with anything relating to my problem? care to explain or you're just talking just so you can talk?

 

[BadNewsBears]

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

Good idea! Cheap quality wastegate or blowoff valve? Maybe the spring is sticking?

 

[Kroze]

Originally posted by: Munchies
Im not too good with newer import more than one cam engines, but I will take a stab. Check all the flanges and connections in the exhaust with a cool engine and some water on the seams. If its leaking the water will spray around. Pull the downpipe and inspect. Cracked exh. manifold?

if it's cracked, shouldn't i hear the noise at anytime instead of just when i first press the gas pedal and when i let go of it?

and it couldn't be the manifold because the sound is like directly underneath me.

 

[FrustratedUser]

Originally posted by: Kroze

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

what does that have to do with anything relating to my problem? care to explain or you're just talking just so you can talk?

See reply from Munchies.

 

[Kroze]

Originally posted by: Munchies

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

Good idea! Cheap quality wastegate or blowoff valve? Maybe the spring is sticking?

i just replaced the BOV.

about the actuator... how could it cause the sound?

 

[Kroze]

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

A wastegate job is to open and let the excessive exhaust air flow through so it can regulate boost pressure.

so what you're saying doesn't make sense. even if it doesn't have a wastegate, in your case, a fake wastegate. all that just means is that my turbo will just keep on building boost until it spins so fast and explode.

how does that relate to the poping noise?

again. are you just talking to talk?

 

[Eli]

Originally posted by: Kroze

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

A wastegate job is to open and let the excessive exhaust air flow through so it can regulate boost pressure.

so what you're saying doesn't make sense. even if it doesn't have a wastegate, in your case, a fake wastegate. all that just means is that my turbo will just keep on building boost until it spins so fast and explode.

how does that relate to the poping noise?

again. are you just talking to talk?

Bah, STFU. Your attitude sucks.

Just fix it yourself.

 

[BadNewsBears]

Just take a day off work, pull anything that has exhaust or pressure in it and inspect, find it and replace. Just do it.

 

[ironcrotch]

Originally posted by: Eli

Originally posted by: Kroze

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

A wastegate job is to open and let the excessive exhaust air flow through so it can regulate boost pressure.

so what you're saying doesn't make sense. even if it doesn't have a wastegate, in your case, a fake wastegate. all that just means is that my turbo will just keep on building boost until it spins so fast and explode.

how does that relate to the poping noise?

again. are you just talking to talk?

Bah, STFU. Your attitude sucks.

Just fix it yourself.

 

[Ryan]

Originally posted by: Kroze

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

A wastegate job is to open and let the excessive exhaust air flow through so it can regulate boost pressure.

so what you're saying doesn't make sense. even if it doesn't have a wastegate, in your case, a fake wastegate. all that just means is that my turbo will just keep on building boost until it spins so fast and explode.

how does that relate to the poping noise?

again. are you just talking to talk?

Well, I was going to drop some suggestion, but after reading that - No.

 

[Klixxer]

Originally posted by: Kroze

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

A wastegate job is to open and let the excessive exhaust air flow through so it can regulate boost pressure.

so what you're saying doesn't make sense. even if it doesn't have a wastegate, in your case, a fake wastegate. all that just means is that my turbo will just keep on building boost until it spins so fast and explode.

how does that relate to the poping noise?

again. are you just talking to talk?

You obviously don't have a clue yourself, so shut it, i COULD tell you what it is, but since you are such an asshole, i won't.

Go away and don't come back.

 

[Klixxer]

Umm after all Frustrated, let's be nice, after all this might blow out his top.

It is the exhaust valves, you need to replace then, after some time they tend to clog up and that could actually make them stick so hard you could blow your top You need to remove them, i am sure you know how, just remove the top and you will probably need to use an iron and a screw driver, don't worry about the springs, just keep them for reinstalling, then you dip them into a saline solution, that will make them nice and clean and then just put the springs on them and shove them back in, again, use force if neccessary, a good hammer will do the job, make sure it is flat though, and hit them head on, not sideways or you might cause leakage.

Well, there you go, no more sounds, i am willing to make a bet on that.

 

[DivideBYZero]

You say replaced your BOV. Did it make this sound before you did this? Is it a VTA (Vent to Atmosphere)? If so, you WILL get a Pssht when lifting the throttle, but not when applying.

If you have a boost gauge, is it holding boost? If not, the BOV may be to blame with a ripped diaphram or busted spring.

However, it sounds like you messed up the BOV install. Get a mechanic to check your work.

 

[DivideBYZero]

Also, VTA Dump valves can cause exhaust popping and you say you are getting that.

BOV BOV BOV.

Check it.

 

[StageLeft]

Originally posted by: Kroze

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

A wastegate job is to open and let the excessive exhaust air flow through so it can regulate boost pressure.

so what you're saying doesn't make sense. even if it doesn't have a wastegate, in your case, a fake wastegate. all that just means is that my turbo will just keep on building boost until it spins so fast and explode.

how does that relate to the poping noise?

again. are you just talking to talk?

If you're going to ask for help from people, get a better attitude. If you're as smart as you think you are, you wouldn't be here asking for help.

 

[Klixxer]

Originally posted by: DivideBYZero
You say replaced your BOV. Did it make this sound before you did this? Is it a VTA (Vent to Atmosphere)? If so, you WILL get a Pssht when lifting the throttle, but not when applying.

If you have a boost gauge, is it holding boost? If not, the BOV may be to blame with a ripped diaphram or busted spring.

However, it sounds like you messed up the BOV install. Get a mechanic to check your work.

I always figured the VTA was Vent To AIR, but as i see tit now it is qite clearly the circiumvent to Atmosphere that bypasses the sir filter.

Thank you for that info.

OTHOH i have a lot of experiences with BOV's i have seen cars with over five of them (big, diesel) and it just does not make sense, i still say ithas to be the exhaust valves, well i know, they are hard to et loow but you need to pull that valve untill the spring let's go.

Well, that is my analysis, it COULD be the ATV actually i would check that before diasswmbling an engine.

 

[GasX]

The noise is the OP's id blurting out things without the appropriate filtering. Check your filters.

 

[DivideBYZero]

Surely 5 BOVs would mean 4 were for Air brake applications? Unless they had 5 turbos?!

There are two types that are commonly used on cars: Vent to atmosphere and recirculating. A recirc leaves the air in the intake so that the MAF sensor outputs are correct. A VTA losses the excess boost to the air, and can mean a little over OR underfueling (dependant on the car and ECU parameters AFAIK) for a very breif time. The overfueling would give pops in the exhaust as the unburnt fuel ignites in there.

Forgive me if any of the above is bollocks, but I try.

 

[Klixxer]

Originally posted by: DivideBYZero
Surely 5 BOVs would mean 4 were for Air brake applications? Unless they had 5 turbos?!

There are two types that are commonly used on cars: Vent to atmosphere and recirculating. A recirc leaves the air in the intake so that the MAF sensor outputs are correct. A VTA losses the excess boost to the air, and can mean a little over OR underfueling (dependant on the car and ECU parameters AFAIK) for a very breif time. The overfueling would give pops in the exhaust as the unburnt fuel ignites in there.

Forgive me if any of the above is bollocks, but I try.

Well, we needed them for reassembly of tanks in the 60's, you know, the duals.

This guy is going to blow his top and he will never know what hit him when steel meets steel and it cuts and burns, melts in seconds.

Good luck punk, you are going to end up on some gas /cheap repair station, with a cut engine, a blown top and valves resembling a frisbee hit by a cannonball.

 

[Klixxer]

Originally posted by: Mwilding
The noise is the OP's id blurting out things without the appropriate filtering. Check your filters.

Actually i still think it is a valve job necessary.

 

[Howard]

Originally posted by: FrustratedUser
Maybe the previous owner was a ricer and installed a fake wastegate.

I don't see why even a fake wastegate would make a noise at the beginning of an application/release of throttle.