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While adjusting the pressure sensor can be done (and has been done too often in the past), it has two concentric screws, and if they both move you can't easily get back to your original position. It is extremely unwise to make any adjustment without monitoring the CO as you do it. Even if an adjustment that slightly enriches the fuel mixture stops this 'hunting', it can be a result of the ignition timing changing too. When you adjust the timing, a little advance will often speed up the idle. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ----- Original Message ----- From: "Roush, Norman" <norman.roush@hp.com> To: "Type 3 Mailing List" <type3@vwtype3.org> Sent: Monday, February 10, 2003 4:55 PM Subject: [T3] Idle question follow-up - a little long On 1/17/03 I sent this out to the list: Here's my situation: 1968 Squareback w/FI all stock Start fine Idles @ 1100-1200 when cold Runs fine Idles @ about 800 when warm for a while Then drops to 600 jumps to 1000 and drops to 800 again But still runs fine and smoothly At night I do notice the headlights dim and brighten with the idle fluctuation Points/plugs/trigger points/timing/value adjustment all OK Check fuel pressure some time ago but was at 28-30 lbs Any ideas?? Throttle switch, recheck fuel pressure? ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/