Hi my car seems to be running a little on the rich side. It's just a stock GSR with an intake. Just replaced the plugs, wires, cap and rotor. So how does one lean out the motor so it doesn't run so rich? Thanks.

-Shonn

 

anyone?

 

How do you know its running rich??

Do you have a CEL?? COuld be your o2 sensors? Dirty air filter??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by teknoracing &raquo;</TD></TR><TR><TD CLASS="quote">Could be your o2 sensors</TD></TR></TABLE>

 

Check the timing. o2 sensor/s. If you're getting a code, check if it's not the MAP sensor. In my case I was getting 14 instead of 22 before I got it to work.

 

do you have any exhaust leaks before the o2 sensors? If so fix them

A good sign of an o2 sensor going out s the car running rich (because the o2 reads lead so the ECU tries to compensate)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adseguy &raquo;</TD></TR><TR><TD CLASS="quote">do you have any exhaust leaks before the o2 sensors? If so fix them

A good sign of an o2 sensor going out s the car running rich (because the o2 reads lead so the ECU tries to compensate)</TD></TR></TABLE>

 

well my cars not throwing a code. but the exhaust leak is most likely my problem. I have 2 bolt holes that are stripped out on the head. Other then that it runs fine. Anyone know where I could get the holes fixed? Oh yea i'm in washington by the way. Thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Shonn &raquo;</TD></TR><TR><TD CLASS="quote">well my cars not throwing a code. but the exhaust leak is most likely my problem. I have 2 bolt holes that are stripped out on the head. Other then that it runs fine. Anyone know where I could get the holes fixed? Oh yea i'm in washington by the way. Thanks.</TD></TR></TABLE>

By running rich, do you mean that you can smell uncatalyzed exhaust from your leaking manifold?

 

wow, thats a big word.

fresh air is being sucked into the exhaust stream and flowing across the O2 sensor, since fresh oxygen is going across the O2 the ECU thinks the car is lean and goes rich to a point BUT the MAP sensor will limit the fuel delivery based on vacuum, were the valves adjusted, how many volts is the MAP at idle please.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Duane_in_Japan &raquo;</TD></TR><TR><TD CLASS="quote">wow, thats a big word.

fresh air is being sucked into the exhaust stream and flowing across the O2 sensor, since fresh oxygen is going across the O2 the ECU thinks the car is lean and goes rich to a point BUT the MAP sensor will limit the fuel delivery based on vacuum, were the valves adjusted, how many volts is the MAP at idle please.</TD></TR></TABLE>

At best, a pre O2 sensor exhaust leak would cause a pressure reduction of the exhaust stream. There is not vacuum in the exhaust to draw extra oxygen inwards. A throttled (this referrs to a pressure drop aross a tortuous crack, not a throttle body) leak at the exhaust manifold flange is also not going to have a Venturi effect.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">At best, a pre O2 sensor exhaust leak would cause a pressure reduction of the exhaust stream. There is not vacuum in the exhaust to draw extra oxygen inwards. A throttled (this referrs to a pressure drop aross a tortuous crack, not a throttle body) leak at the exhaust manifold flange is also not going to have a Venturi effect.</TD></TR></TABLE>

I AM SORRY MY FRIEND, it is extremely possible to casuse a venturi affect and it is real world, maybe this is not this vehicles problem but it is very possible.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Duane_in_Japan &raquo;</TD></TR><TR><TD CLASS="quote">

I AM SORRY MY FRIEND, it is extremely possible to casuse a venturi affect and it is real world, maybe this is not this vehicles problem but it is very possible.</TD></TR></TABLE>

Perhaps for a large hole where gasses could freely move in both directions across the hole. But in this case, the throttling effect of the leak would prevent gasses from flowing back into the exhaust. As I mentioned above, the OP is thinking rich because he can smell uncatalyzed exhaust leaking from the manifold. I'm sure this is making its way into the cabin as well.