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1994-1995 5.0 Mustang SN95 Tech Forum

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Unread 04-29-2010   #1 (permalink)
brando8912 is offline Rookie


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Default 311 and 314 Codes

I have a 95gt and need some help. I ran an obd1 test and was getting a 311 code. I was checking the red and green vacuum lines on the intake and EGR and broke both of them because they were so brittle. I replaced them both all the way to the 3 way connection underneath my CAI. I started the car and it will not flash the check engine light where it didnt before. I pulled the codes again and now I am getting a 314 and 311. I checked all the hoses and they all look good. The only thing I did different is I switched the hoses from that hard plastic to the soft vacuum hose. Is this going to make a difference? If not what is the next thing to check?
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Unread 04-29-2010   #2 (permalink)
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311 - AIR system not working - Single, Right or Rear HO2S - Air Injection

314 - AIR inoperative, Left or Front HO2S - Air Injection

First, those codes are for the SMOG / AIR system, not the EGR, which is OK, since the hoses you replaced under the CAI are SMOG related (I think you replaced the lines to the AIRB and AIRD valves).

When you did the KOER test, the computer made the car run rich on purpose, then operated the two valves, and then looked at the O2 sensors. With the valves open, the computer expected the car to move towards a lean condition. These codes indicate that did not happen.

The check engine light will not come on because of these codes.

I wouldn't worry about it if you don't have any other symptoms. The change in vacuum hose is not the cause of the codes. You could have one of the valves sticking or something. The pump could be shot. It is hard to sya for sure, as there is no way to test any of the components individually.

I would yank the crap out, personally. It isn't working anyhow and won't affect driveability
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2006 GT - Vortech polished w/ intercooler, Eibach suspension, Hurst short-throw, some other goodies - tuned by Paul's High Performance. It moves...

and it collects dust admirably while parked for repairs in the garage...

SOLD - 1995 Black Mustang GT, AODE. Loved it, but I had to let it go...

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Unread 04-29-2010   #3 (permalink)
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We have emissions here in my county. So i need it all hooked up i assume to pass emissions. Originally the 311 code didnt cause the check engine light to come on. I noticed it come on today. When i checked the codes, the 314 was there. I checked and the red hose is on the intake and the green on the egr valve.
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Unread 04-29-2010   #4 (permalink)
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OK then, don't remove it. It is fixable. I read your initial post wrong. Sorry.

Just to double check:

The pink line that has the straight boot / connector on it goes to the AIRB up by the alternator.

The line that comes from the fenderwall (cant remember what color, maybe light bluish or light green?) with the 90 degree boot hooks up to the AIRD right under where the throttle body hooks up to the CAI.

The red line hooks up to the intake next to the throttle body.

The green line hooks up to the EGR.

The pink, red, and green all hook together into a plastic thingy. All good?

If the red and green lines were bad, it is possible one of the other lines is bad as well. Heck, they could all be bad. Might as well replace them just to be sure.

I am confused about the CEL. The SMOG will not throw the CEL. I am thinking it is going to end up being EGR related, but at this point without a code, that is a complete guess. Was the car idling when it flashed? Were you driving down the road? At a little bit of throttle or a lot?

Maybe someone else can chime in with something I am forgetting...
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2006 GT - Vortech polished w/ intercooler, Eibach suspension, Hurst short-throw, some other goodies - tuned by Paul's High Performance. It moves...

and it collects dust admirably while parked for repairs in the garage...

SOLD - 1995 Black Mustang GT, AODE. Loved it, but I had to let it go...

mjmalegalsolutions.com
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Unread 04-29-2010   #5 (permalink)
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Yeah all the hoses are on the correct spot. I just replaced the red hose from the back side of the intake to the 3 prong adapter and the other was the green hose from the egr valve to the adapter. I dont get the CEL when i drive slow. Say under 45mps. If i open it up a little and get on the highway is when i get the CEL. I had the 311 code originally not the 314 has shown up since i replaced the hoses.
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Unread 04-29-2010   #6 (permalink)
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also lemme get this right on how it works.... the egr vacuum regulator causes the airb and aird solenoids to open the respective valves? Or am i totally off?
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Unread 04-29-2010   #7 (permalink)
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I believe the AIRB solenoid gets a signal via a white/orange wire connected at pin 31? AIRD gets a signal from a brown wire from pin 34? I have no idea how that crap hooks together though. I don't know where to find those wires in the harness or what plug it is in or anything off the top of my head. My guess is that its in the passenger side fender area, but other than that I don't know.

I also believe that the little vacuum tree is just a way to get three different lines to run off of a single vacuum source. The vacuum for the two systems, although it hooks together, is not interdependent. But, if there is a vacuum leak anywhere, it may affect any other vacuum operated device that draws form the same source as the leak will reduce the amount of available vacuum. So, a leaky vacuum to AIRB, for example, can possibly have an effect on the EGR. That effect, though, is because the vacuum will essentially be "stolen" by the leak, thereby reducing the vacuum available for the EGR to operate.

Kinda deep for me, but I think I am accurate.

Of course, I am always open to being corrected...

Here is a link that shows the connection the the EGR and the SMOG system being independent. Over on the right side you will see the different electrical going to the EGR and SMOG.

http://www.veryuseful.com/mustang/te...ansmission.gif

Here is a link that identifies the pin outs:

http://www.veryuseful.com/mustang/te...ng_Diagram.gif
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2006 GT - Vortech polished w/ intercooler, Eibach suspension, Hurst short-throw, some other goodies - tuned by Paul's High Performance. It moves...

and it collects dust admirably while parked for repairs in the garage...

SOLD - 1995 Black Mustang GT, AODE. Loved it, but I had to let it go...

mjmalegalsolutions.com
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