<VV> 828 miles this weekend - car running lean - adviceappreciated
deltainc at grm.net
Wed Oct 7 15:53:11 EDT 2009
----- Original Message -----
From: <BobHelt at aol.com>
Subject: Re: <VV> 828 miles this weekend - car running lean -
> In a message dated 10/5/2009 6:04:33 A.M. US Mountain Standard Time,
> guusdehaan at me.com writes:
> On our trip to Germany it was almost on lambda 14,7 all
> the time (mine has a Safe Guard system with sensor in the exhaust).
> But on the way back home it started running leaner and leaner (near
> 11). Does anyone have an explanation what could cause this?
> 11 would indicate a rich mixture rather than a lean one. Are you sure that
> it's 11:1?
> In my experience and research, I have found the rubber accel pump
> a problem area. The rubber hardens from natural aging and it causes the
> mixture to go rich. I don't know why this would happen during operation,
> it happens otherwise. The diaphragm is fairly easy to replace. I would
> start with that.
> Bob Helt
Also, the older fuel/air oxy sensors are notorious for only being "accurate"
when the mix is near 14.7 ..... if he is reading 11/1, with the older
sensors.... it really only means he is rich... not too dependable on " HOW "
rich. Maybe it is really 13.7, which is not too bad.
First thing I would check if its the older type Oxy sensor ... I would call
Safe Guard and ask for a short discussion, giving them the serial # on his
Hmmm. wonder if he went thru any great altitude change, or even
Just a thought... ken campbell, deltawerkes
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