Is there anything more I can do to pass here? I already retimmed, changed plugs, and will replace airfilter. I know I can use the carb to lean it out, but I don't know how. I mostly know motorbike carbs...


Here are my emision results.
Please god let the formatting survive.

<TABLE style="TABLE-LAYOUT: fixed; WIDTH: 368pt" cellSpacing=0 cellPadding=0 width=490 border=0>

<COLGROUP><COL style="mso-width-source: userset; mso-width-alt: 4498" width=123></COLGROUP>
<COLGROUP><COL style="WIDTH: 68pt; mso-width-source: userset; mso-width-alt: 3291" width=90></COLGROUP>
<COLGROUP><COL style="WIDTH: 48pt" width=64></COLGROUP>
<COLGROUP><COL style="WIDTH: 64pt; mso-width-source: userset; mso-width-alt: 3108" width=85></COLGROUP>
<COLGROUP><COL style="WIDTH: 48pt" span=2 width=64></COLGROUP>
<TBODY><TR style="HEIGHT: 15pt" height=20>

<TD class=xl68 style="HEIGHT: 15pt" width=123 height=20> </TD>
<TD class=xl67 style="WIDTH: 68pt" width=90>HC (PPM)</TD>
<TD class=xl67 style="WIDTH: 48pt" width=64>CO (%)</TD>
<TD class=xl67 style="WIDTH: 64pt" width=85>CO+CO2 (%)</TD>
<TD class=xl67 style="WIDTH: 48pt" width=64>O2 (%)</TD>
<TD class=xl67 style="WIDTH: 48pt" width=64>RPM</TD>

</TR>

<TR style="HEIGHT: 15pt" height=20>

<TD class=xl67 style="HEIGHT: 15pt" height=20>Cruise Limit</TD>
<TD class=xl68 align=right>400</TD>
<TD class=xl68 align=right>3</TD>
<TD class=xl68 align=right>6</TD>
<TD class=xl68>N/A</TD>
<TD class=xl68>N/A</TD>

</TR>
<TR style="HEIGHT: 15pt" height=20>

<TD class=xl67 style="HEIGHT: 15pt" height=20>Cruise Emissions</TD>
<TD class=xl68 align=right>48</TD>
<TD class=xl68 align=right>1.51</TD>
<TD class=xl68 align=right>16.01</TD>
<TD class=xl68 align=right>0.15</TD>
<TD class=xl68 align=right>2580</TD>

</TR>
<TR style="HEIGHT: 15pt" height=20>

<TD class=xl67 style="HEIGHT: 15pt" height=20>Cruise Result</TD>
<TD class=xl68>Pass</TD>
<TD class=xl68>Pass</TD>
<TD class=xl68>N/A</TD>
<TD class=xl68>N/A</TD>
<TD class=xl68>N/A</TD>

</TR>
<TR style="HEIGHT: 15pt" height=20>

<TD class=xl67 style="HEIGHT: 15pt" height=20>Idle limit</TD>
<TD class=xl68 align=right>400</TD>
<TD class=xl68 align=right>3</TD>
<TD class=xl68 align=right>6</TD>
<TD class=xl68>N/A</TD>
<TD class=xl68>N/A</TD>

</TR>
<TR style="HEIGHT: 15pt" height=20>

<TD class=xl67 style="HEIGHT: 15pt" height=20>Idle Emissions</TD>
<TD class=xl68 align=right>130</TD>
<TD class=xl68 align=right>6.53</TD>
<TD class=xl68 align=right>17.23</TD>
<TD class=xl68 align=right>0.68</TD>
<TD class=xl68 align=right>890</TD>

</TR>
<TR style="HEIGHT: 15pt" height=20>

<TD class=xl67 style="HEIGHT: 15pt" height=20>Idle Result</TD>
<TD class=xl68>Pass</TD>
<TD class=xl68>Fail</TD>
<TD class=xl68>N/A</TD>
<TD class=xl68>N/A</TD>
<TD class=xl68>N/A</TD>

</TR>



</TABLE>

 

I'm sorry, I wish I knew how I did that. It when I tried to edit it won't let me delete the spaces. I'm gonna try and use a non-beta browser when I get back on a XP machine...

 

It would probably help if you identified what you're working on and which state you're dealing with....

Steve

 

Sorry, late night [*grin*]

Its a 1985 F250 with a 460. I'm in Washington.

Are you the same project SHO guy form PerformanceProbe.com ?

 

Nope, not me....

Was this a tailpipe idle test or a dyno/treadmill test?

Perhaps someone with specific experience can jump in, but high CO levels are due to unburned fuel in the exhaust. Common reasons are timing off, too rich mixture, not enough airflow, carb issues, etc...

My experience is mostly with fuel injected systems, haven't worked much with carbs..

Good luck.

Steve

 

High CO is a rich condition.

For idle, there is an 'idle mixture screw' on the carb, right at the level of the throttle plate. Screw it in until the engine stumbles, then back it out just until it smooths out. You may have two, one for each primary.

At above idle, there could be a high float level, partially blocked air bleed, leaking needle/seat valve, too large a main jet, restricted air intake or an internal leak in the carb.

 

I was able to get a '76 F250 w/ 460 from Washington to pass California emissions. What kind of carb do you have? I had to rejet my carb to get it dialed in. You seem like it's rich with CO that high. I had the same problem at idle and high rpm was OK.