NF engine running too lean

[Ben Swann]

Clean, part disassemble if need be and reinstall.  Use new O-ring kit available from
dealer.   Replace O2 sensor if still having problem

CIS-E3 DPR current occillates around 0, so current  may not be detectable if near Stoich
at idle.  Best to have idle mixture set slightly lean so DPR has to compensate and then
enrich ever so slightly for best idle – not over ¼ turn from lean side of good idle.

Ben

[Date: Mon, 24 Sep 2007 00:03:21 +0200
From: "Eyvind E. Spangen" <200q20v at bluezone.no>
Subject: NF engine running too lean
To: <quattro at audifans.com>
Message-ID: <001501c7fe2d$8dff9830$a9fec890$@no>
Content-Type: text/plain;	charset="windows-1250"

Thanks a lot! Now I went to the junkyard and pulled a DPR from a car there.
I was thinking about pulling the whole metering head/air flow plate thing, but it was
just too messed up with connectors left open etc, so I left it alone, only got the DPR,
which was not messed with like the one I had on my car.

I installed this, and now the car feels a lot better and has got almost perfect CO
content. But when driving, it's too lean. The car lacks a lot of power and feels like
it's slightly missing. If I try going up a hill in 5th at about 60 mph, it almost won't
keep the speed.. I tried richening the mixture almost 1/4 turn, but that was far too
much. Tried 1/8 turn and did not feel very much difference at all. I have the Bentley
manual and will try all the measurements there, but it is kinda weird that the car is
running so lean, but richening the mixture makes no difference until it gets to 1/4 turn
and far too rich.. With the old DPR, the car was running far too rich, CO content over
10%, but it had the correct power. Now it's slower than a school bus.. :P

I tried measuring the DPR current using some cables I made. I'm sure they are working
and connected the right way, I set my multimeter to 200 mA, but I got nothing except
0.00 anyway. Will the current stay at 0.00 all the time if the car stays in open loop?

--
E. Spangen]