apparent lean running issue?

[Dave Yentema]

apparent lean running issue?Thanks Ben, I'm definitely doing the seals/plastic inserts/etc asap, I'm just looking up as much info on doing them as I can because I know mine are the originals and the plastic inserts will be stuck and like eggshells. I was recommended to keep a vacuum with a crevice adapter on it right next to where I'm working while picking out the pieces of the insert so as to not drop TOO many plastic bits in... I was also told there is a mercedes CIS injector that is a lot cheaper than the audi one, do you or anyone know anything about this?



----- Original Message ----- 
  From: Ben Swann 
  To: yentemad at rider.edu 
  Cc: 
  Sent: Tuesday, November 11, 2008 9:04 AM
  Subject: apparent lean running issue?




  Dave, 

  If you have not replaced your injecvtor seals yet then by all means - do it! You could actually be blowing fuel out of the injector seal area while under boost and at idle pulling in too much air making it lean.  New injectors are not a bad ideal and in the interest of labor, I'd do sealks and injectors at same time, to save on labor.

  Ben 

  [ate: Mon, 10 Nov 2008 19:33:07 -0500 
  From: Dave Yentema <yentemad at rider.edu> 
  Subject: apparent lean running issue? 
  To: quattro at audifans.com 
  Message-ID: <000001c94395$765e9d30$ae033b0a at Daveslaptop> 
  Content-Type: text/plain; reply-type=original; charset=iso-8859-1; 
          format=flowed 

  OK well, I've got every vacuum leak that I know of taken care of, just put a 
  new VC gasket on, replaced 90% of my vac lines (the rest I know are fine), 
  put a new o-ring on my oil dipstick, new oil filler cap, silicone breather 
  hoses from 034, etc. I wish I had a WB 02, but my narrowband shows a 
  definate trend of running lean. At idle sometimes it'l wobble back and forth 
  around stoich, going slightly(like one "bar") rich which is the way I had 
  originally set it. But most of the time it bounces slightly lean to high 
  stoich, sometimes rich, and the idle surges as it changed. When I first hit 
  the gas to accelarate, it'll snap down so lean its not on the gauge and then 
  come back up, bouncing from like 3 bars of lean to 1 bar of rich, while 
  spending more time in lean. Under full throttle it'll go rich like it 
  should, but the second I let off the slightest bit it'll start bouncing lean 
  again even under boost!!!. on decel(letting my foot off completely from 
  doing like 50) the exhaust pops irradically, and the gauge is all over the 
  place but likes to hang out in the rich area( my car's an autobox, so no 
  decel valve) I felt it miss twice the other day under mild accelaration. I 
  was thinking perhaps it was my injectors/seals because for a while I had a 
  leaky VC gasket, so maybe the seals got soaked with oil and got destroyed. 
  Any suggestions are awesome 

  Oh yea, its a 87 5ktcs 

  TIA 
  -Dave]