A/F Gauge Problem......
Senior Member
Joined: Aug 2001
Posts: 660
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From: Alberta
hmmm...
I am running the Bosch O2 sensor on my '89 TII and I get straight up rich when WOT, with cruise control I get it bouncing between lean and stoich (crossing into rich sometimes).
Fifth gear is a little odd though, at cruise at 60 MPH (100KPH) it cruises at the top of lean boucing back and fourth between low lean and top lean, then it sometimes floors it and goes straight rich. So I just cruise at 130 KPH so that it is boucing between rich and lean.
It could be reliant on the O2 sensor as well.
Letting off the gas makes for no lights (nothing but air going through the engine).
For installation I just stripped my a/f gauge signal wire (which I ran a second one off the one that came with the meter) and stripped it long enough to fit around the little pin in the connector from the O2 sensor to the wire mess in the engine, then I just closed the connector (the wire has to be stripped enough so that the plastic part of the wire doesn't get squished into the connector.
Anyways, mine reads good and works fine, with minor discreptencies.
Fifth gear is a little odd though, at cruise at 60 MPH (100KPH) it cruises at the top of lean boucing back and fourth between low lean and top lean, then it sometimes floors it and goes straight rich. So I just cruise at 130 KPH so that it is boucing between rich and lean.
It could be reliant on the O2 sensor as well.
Letting off the gas makes for no lights (nothing but air going through the engine).
For installation I just stripped my a/f gauge signal wire (which I ran a second one off the one that came with the meter) and stripped it long enough to fit around the little pin in the connector from the O2 sensor to the wire mess in the engine, then I just closed the connector (the wire has to be stripped enough so that the plastic part of the wire doesn't get squished into the connector.
Anyways, mine reads good and works fine, with minor discreptencies.
Last edited by PraxRX7; May 28, 2002 at 09:40 AM.
Thread Starter
Full Member
Joined: Jul 2001
Posts: 92
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From: Anchorage, AK
Originally posted by HAILERS
Try the 13th pin, top row, counting from the right to the left. Thats with the connector connected and lookin in the back of the plug.
Try the 13th pin, top row, counting from the right to the left. Thats with the connector connected and lookin in the back of the plug.
Passenger
Posts: n/a
how many sheilded wires run to the ecu??? after fudging with trying to attach it to the sensor wire itself, i tapped into the wire by the ecu. i just looked for one that was sheilded and taped into it, it works just about the same as it did before, but when you start it now its in lean until it warms, and before it started in rich till it warmed?????????
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 27
From: FORT WORTH, TEXAS,USA
http://www.fc3s.org/ That site, under MANUALS, has the pin out for the 89 ECU.
I'm a boost creep...
Joined: Jan 2002
Posts: 15,608
Likes: 8
From: Auckland, New Zealand
Originally posted by chris-reed
how many sheilded wires run to the ecu???
how many sheilded wires run to the ecu???
i just looked for one that was sheilded and taped into it
it works just about the same as it did before, but when you start it now its in lean until it warms, and before it started in rich till it warmed?????????
Senior Member
Joined: Mar 2002
Posts: 359
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From: San Lorenzo, CA, USA
so... without the o2 sensor you cant connect the a/f guage? thats the idea i'm getting... the 87 TII i got had straight pipe and the DP doesnt have a sensor (well it's welded close), and the car already has a a/f guage
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 27
From: FORT WORTH, TEXAS,USA
Gotta have the o2 sensor for the gauge to work. Need the 02 sensor for the ECU to work to its full potential, although the o2 is not in the loop at idle or full throttle. But you spend a lot of time in between whether you admit or not.
Lives on the Forum
Joined: Feb 2001
Posts: 26,664
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From: n
Re: umm...
Originally posted by PraxRX7
doesnt the car need an oxygen sensor to run properly??
doesnt the car need an oxygen sensor to run properly??
The engine will actually run pretty good with one.  Hell, some people even claim the cars runs better without one.  The ECU will default rather rich if it doesn't "see" and O2 sensor, so this does is decrease our gas mileage.
-Ted
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