1g talon hesitates and fuel runs rich all the time.

[assassin3117]

Hey guys. i just bought a 92 Talon from a friend. he had issues and didnt even try to fix it. so i got it off him for 500 bucks. these are the symptoms. first off i did read the other threads. ok it takes more than a few cranks to start. and when it does it idles high then slowly shuts down. so it takes a few times before she stays on. i can hear the blow off valve pretty loud but its an after market one. not sure what type. but the vacum line goes back to the intake. so while i am driveing, if i try to keep a steady speed of any speed it will not re act and start sputtering and jerking. but if i press the gas pedal a little more she gets up and goes. also while idleing for only 15 minutes it ate up alot of gas. driving from my house to the gas station which is like 10 miles it drank almost 8th of a tank. i can smell unburnt fuel coming out the exhaust and see black smoke. if i press the gas pedal while idling it struggles and stutters as the RPM needle goes up like its choking. i am in the military so i dont make much to buy alot of parts to try and limit what the cause is. so i am hoping for a pretty good answer to what the coperate is. thanks in advance.

Mike
US Navy

 

[assassin3117]

how would i go about doing that?

 

[16vtawd]

You can't do it with the bov you currently have but you just put a hose on the open end of the bov to the hole that is capped on the intake pipe.

 

[assassin3117]

where can i see a picture of this? cause there is a vacuum line on the end of the BOV going to the intake

 

[16vtawd]

its not the hose the goes to the manifold it would be a rubber hose that goes from the bov outlet back to the intake.[/url]

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[assassin3117]

ok i see what your talking about. but is it going to destroy my engine venting like it is now? i would like to know what the draw back would be. thanks for the pic helped allot i mean since i change the ECU its not running rich at all. gas mileage seems great for a turboed car. idleing like it should and i dont notice any lag while driving or shifting.

 

[->PrOjEcTGS<-]

You'll run rich whenever the BOV is venting air.

 

[assassin3117]

You'll run rich whenever the BOV is venting air.

its not running rich at all runs lime a dream I wish so e one will explain exactly how venting will hurt my engine. Idont run rich and I have no loss of power

 

[->PrOjEcTGS<-]

its not running rich at all runs lime a dream I wish so e one will explain exactly how venting will hurt my engine. Idont run rich and I have no loss of power

Bolt-on Modifications
after market BOV K&N air filter custom turbo back exhuast
Engine Management
none
Engine Internals
none
Drivetrain Modifications
none

Are these your mods? I got them from your profile. If indeed they are correct they do not specify that you have either a Wideband O2 sensor nor a Datalogger of any kind. Therefore you cannot prove to me that it does not run rich with the BOV vented to the atmosphere.

With that said... On to the drawbacks of venting your BOV. The concept of the MAS is to measure the mas of the airflow coming into the engine. On our cars it measures this before the turbo. Therefore the air goes through the MAS into the turbo, into the IC pipes, through the intercooler into the upper IC pipe and into the throttle body. Any leak from the point of the MAS to the engine is called a boost leak. Now, if the MAS sees all this air coming into the engine it assumes that it is making it to the engine. Well, if your bov is venting air into the atmosphere and not getting redirected into the intake stream post MAS then you will be running rich since the ECU believes there is air getting to the engine and is injecting fuel according to that calculation. That means any time your BOV is open your ECU will be injecting the wrong amount of fuel for the air it is actually getting.

There are ways around this. It's called the GM Mas Airflow Translator. Where we take the GM 3" Hotwire MAS and place it in the upper intercooler pipe after the BOV and before the throttle body. Since it is after the BOV you can vent to the atmosphere all you want and it will make a difference with the airflow calculations. You can also convert your car to speed density. This is where you get rid of the MAS all together and replace it with the GM Intake Air Temp sensor and GM Manifold Absolute Pressure sensor. These two sensors along with the speed of the car determine a load range that you are in and base what fuel needs to be injected off of a VE chart that is hard coded into the ECU. This also will allow you to vent to the atmosphere.

So really all you are gaining by venting is the cool whoosh sound you hear when letting of the throttle....