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flosho · Posted: Sun Apr 15, 2007 12:13 pm Post subject: Still Lean Air Fuel Reading

Ok, so I got the same problem I had last year before I put my car away for the winter.

I've had the o2 sensor and the air/fuel gauge tee'd into into one. Basically at warm up it would idle fine and run good when giving it 75%+ throttle it would be right near the "rich" and "stoich" line. However once it warms up, it basically cruises on the line between "lean" and "stoich." When I go WOT it basically stays the same, which I do not like.

So tonight I decided to disconnect the oxygen sensor. Now it's even WORSE. At idle the idle is a bit rough and low. While cruising at speed its BARIED rich and soon as I get in the gas, it goes waaay lean, leaner than before.

So it seems like the a/f ratio wasn't set very well from the get go. Any suggestions on where to start with this?

*The air/fuel gauge IS a narrowband, and I know they are semi-worthless but its good for telling you to stop before you blow up.
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Rasta Monsta · Joined: 12 Jul 2006 Posts: 11723 Location: PacNW

A wise man recently told me not to adjust the mixture until system & control pressure are checked. JC Whitney has a cheap tester that people around here say works fine.

Another said he had never tested a factory-installed WUR that didn't suffer from some sort of sporadic failure.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

leadfoot · Posted: Sun Apr 15, 2007 4:51 pm Post subject:

and check for vacuum leaks/exhaust leaks...
leadfoot
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

flosho · Posted: Sun Apr 15, 2007 4:55 pm Post subject:

I think I'm going to get my wideband bung welded into this coming week... Then maybe just finish buying the rest of the Megasquirt and say SCREW CIS!

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[This Space For Rent]