Date: Fri, 9 Aug 2013 09:06:34 -0600
Reply-To: OlRivrRat <OlRivrRat@COMCAST.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: OlRivrRat <OlRivrRat@COMCAST.NET>
Subject: Re: Failed Emissions - High HC at Idle
In-Reply-To: <CD12C84B-5ACD-49B8-ADBD-5E746943DE67@comcast.net>
Content-Type: text/plain; charset=WINDOWS-1252; format=flowed; delsp=yes
Scott
Since your previous Eng was an oil burner your O2Snsrs or Cat may be
Dirty/Fouled ~ it's my understanding that an overnight soak in
Gasoline can clean an O2Snsr ~ I'm not sure if a Cat is Cleanable or
not but it might be worth a try. Also be sure you have GoodConnections
on the O2Snsr Circuits ~ are you running both Up&DownStream O2Snsrs ~
ORR ~ DeanB
On 9 Aug , 2013, at 1:09 AM, OlRivrRat wrote:
> According to a 2002 Impreza ServiceManual that I have ~
>
> Idle speed at Park/Neutral position (A/C OFF)
> 650(MT) 700(AT)
>
> 650 is where mine idles most of the time with brief dips to 637 &
> bumps to 662 ~ on very rare occasions
>
> it will do a brief dip 625 ~ Idle is very smooth @ any of those RPMs.
>
> If you want it to run @ 700 you can alter the ECU to think it
> is in an A/T ~ My ECU was originally set
>
> for A/T & I switched it to M/T ~ It's a real GasSipper @ 650RPM,
> only .17GPH on SummerGas.
>
> ORR ~ DeanB
>
>
> On 7 Aug , 2013, at 9:13 PM, Dennis Haynes wrote:
>
>> Being this is a Subaru engine isnt the idle electronically
>> controlled? 650 rpm seems low and that could be part of the
>> problem. The CO of .15% may indicate a "lean miss fire" condition.
>> The HC reading 0f 87 at 2,500 rpm is also a problem. I'll bet a new
>> catalytic converter will take care of both problems. I would do a
>> compression and leak down test to make sure all is in order, then
>> look for vacuum leaks or bad injectors. The should be able to check
>> emissions pre and post the Cat to see if it is working.
>>
>> Dennis
>>
>>
>> -----Original Message-----
>> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
>> Behalf Of Gmail
>> Sent: Wednesday, August 7, 2013 12:17 PM
>> To: vanagon@GERRY.VANAGON.COM
>> Subject: Failed Emissions - High HC at Idle
>>
>> Just failed UT emissions with high HC at idle. Strange thing is
>> this is the exact set up I had before installing a different zero
>> time rebuild due to the first using too much oil. The only
>> difference with this new rebuild is the idle is now around 650 rpm
>> where as the original rebuild idled at 800-900 rpm.
>>
>> Im wondering if I adjusted the idle back up to the higher numbers
>> it might pass.
>>
>> Idle CO2 12.96 O2 3.14 HC 287 CO .15
>> 2500 CO2 14.75 O2 .47 HC 87 CO .21
>>
>> Thanks
>>
>> Scott