RE: [DMCForum] Re: weirdness (On Topic)

["Travis Goodwin" <tgoodwin@xxxxxxxxxxxx>]

True true. My car ran great during the winter with the BTTF conversion on
it, but now it's a little sluggish and the temp doesn't seem to get up
high
enough to activate the 02 sensor.

> -----Original Message-----
> From: cruznmd [mailto:racuti1@xxxxxxxxxxxx]
> Sent: Thursday, December 18, 2003 7:01 AM
> To: DMCForum@xxxxxxxxxxxxxxx
> Subject: [DMCForum] Re: weirdness (On Topic)
> 
> 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
> >
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