Louie, In our cars, the O2 sensor doesn't do ANYTHING until it reaches 300- ish degrees. The element has to be heated by the exhaust (Bosch K-E- Jetronic actually has a heater for the O2 sensor to speed this up) before it can start sending voltage to the ECU. While your sensor may need replacing, that's not why you are so rich when cold. When we had the tech session here, we put the fuel test rig on my car and it was noted that my "cold" control pressure was -way- below spec. (Bummer because it's the 2nd new regulator so far) I suspect you have the same problem. Your "cold" control pressure is too low, and in the meantime the little heater element in the regulator is warming up. When it finally does warm up, your "warm" control pressure is probably correct and the car drives fine. There are other "enrichment" cycle things happening at that time too but the smell of fuel points me in this direction. You and Bill should split the cost of a fuel pressure test rig ($50.00 from JC Whitney) and see what's what. Get it? Got it? Good. Rich #5335 --- In DMCForum@xxxxxxxxxxxxxxx, Louie Golden <louie@xxxx> wrote: > I've always noticed that my car runs very rich when cold. By cold I mean after it's sat overnight, or as in this evening when it sat for almost 4 hours in sub-freezing temps. And I'm not just talking a little rich, the car almost drowns itself for a couple of minutes before something changes and it starts running perfectly. The car puffs out unburned fuel, and is barely driveable until it's warm. Again, this only lasts about 2 minutes after the car is initially started. I know that the car likely needs a new O2 sensor because it also hunts at idle when the engine very cold. Is my O2 sensor drowning my car at start-up, or is something else faulty? Bill has tried to explain the DeLo idle and warm up system to me many a time, but my understanding of the system is pretty foggy. Anyone have any idea what's going on with my car? This evening was the worst I've ever seen the car behave. It was stumbling terribly, and I didn't go away as fast as normal. I pulled over to make sure I didn't have a clogged glowing cat, and when I got in the car and pulled off it was running perfect. It was the strangest damn thing. I'm totally befuddled. -Louie > > _____________________________________________________________ > Buy and sell stocks in NFL teams! Get paid dividends every time your team wins! Free limited-time trial at http://www.AllSportsMarket.com/Index.asp?Refer=delomail To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx _____ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/DMCForum/ * To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx <mailto:DMCForum-unsubscribe@xxxxxxxxxxxxxxx?subject=Unsubscribe> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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