1985-1998 [Subscribe to Daily Digest] |
 | [Main 9000 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
running rich, front O2 sensor replacement needed? Posted by geoguy [Email]  (#711) [Profile/Gallery]
(more from geoguy) on Sat, 16 Jun 2007 14:04:10
Members do not see ads below this line. - Help Keep This Site Online - Signup
|
My car is a '97 9K CS, manual trans, with a few mods. For the past couple hundred miles, it has been running extremely rich.
This began after installation of a custom 3-inch downpipe. The installer noted that the front O2 sensor bung on the custom downpipe was located several inches from the stock position, & the sensor's wire wouldn't reach. His actual description, initially, was "the parts you're needin', are still in Sweden" . . . funny guy. :)
So, his boss pulled on the wire until a couple inches of slack behind the motor was re-located to the front (he didn't loosen the cabling clamp beneath the A/C compressor before tugging on the wire; neither he nor I realized that clamp was there, at that time).
No CEL or other indication that anything was wrong, until a couple days later when I was driving to the Carlisle, PA import car show. I noticed then that my fuel consumption was significantly higher than ever before.
Jak Stoll (who built the downpipe) hooked up his scan tool at Carlisle, & said the front O2 sensor had absolutely zero output, & I needed to replace that sensor. Oddly enough, there were no codes set when Jak checked, & I never saw a CEL during the return trip. My assumption at that time was that the exhaust guys had pulled hard enough to damage one or more of the four O2 sensor wires. No idea why no CEL or codes stored as of when Jak checked (I don't have a scan tool . . . yet).
The car has been parked since returning from that trip (getting some paintwork done, actually). I just disconnected that sensor today, & measured 2.5 ohms across pins 1 & 2; the Haynes manual says it should be 3.5 ohms, +/- 0.4 ohms, for a car running unleaded fuel. Is this correct? Frankly, I had expected to see an open circuit.
Getting that sensor wire out of the engine compartment appears to be non-trivial, because of insufficient room to slide the connector in front of the alternator.
Would it be ok to cut off the old connector, leaving a few inches of wire attached, & splice that old connector & wire onto the new sensor cable (after cutting off the new connector & routing the cabling properly), to extend the new O2 sensor cabling? I realize that I'll need to sort out the two white wires correctly (I'm planning to mark the outside one prior to cutting each of the two sensor cables).
Or, is this time to replace the serpentine belt & pulleys, & thereby be able to move the alternator out of the way to make room for the O2 connector? The stock sensor cabling is pretty taut right now, & I'm thinking that a couple extra inches of slack wire (from extending the cable) would be a good thing.
I'm not driving the car until I get this fixed; hopefully I didn't ruin the new cat during that trip to Carlisle.
TIA,
- Mark
, Sat, 16 Jun 2007 14:04:10 <-- Viewing This Message, Sun, 17 Jun 2007 14:02:21
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
