Stalling Open Loop.

[jvskater51789]

Hey my msp has been having this issue recently. When i start the car the fuel starts at normal afr's but start to go super lean to the point where it stalls or comes real close then idles rele high just to repeat itself. This will happen only in open loop. once the car is driven for a few minutes it runs and idles perfectly. what could this be? ne input would be great.

 

[mazdaspeedp]

maybe faulty egr

 

[jvskater51789]

would this throw a cel because as of now i have none

 

[JCell]

yep, faulty egr will trow a cel, get it checked out just to be sure

 

[jvskater51789]

Started getting a few cels popping up. P0103 and P0507. Im thinking its my IACV. Any opinions?

 

[ogsp5]

I had that problem, check your primary 02 sensor. How many miles on the car ? Disconnect the sensor and see how the car runs.
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[jvskater51789]

will try tomorro. only 80000 on the car

 

[jvskater51789]

thanx for the input. but wouldnt the 02 sensor affect the idle all the time not just at first start up?

 

[ogsp5]

thanx for the input. but wouldnt the 02 sensor affect the idle all the time not just at first start up?

It will run rich and you will get a code. See if the car starts and idles w/o a problem. Snap back the connectors and see what happens. I tried to tune out this with my SS afc but no luck

 

[jvskater51789]

its running too lean not rich. my afr gauge is off the charts lean and when it tries to stall i lose a bit of vacuum. when its done having a tantrum and warms up its all perfect

 

[ogsp5]

When you disconnect the o2 sensor the car runs a little rich. The car will idle fine. Then snap the grey connectors back and see what happens. If the car struggles and goes lean. New o2 sensor. I changed mine, now the car runs great.

 

[jvskater51789]

ok gotcha. thanx for the advice. will get back with updates

 

[jvskater51789]

so i did this and it didnt even idle fine when the o2 was diconnected so im thinking its something else

 

[ogsp5]

Did you start the car first, then disconnect the grey connectors ?

 

[jvskater51789]

nope disconnected them first. should i have?

 

[ogsp5]

nope disconnected them first. should i have?

That is what I did. Start the car, when the car goes lean, then disconnect. See what happens.

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