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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Do I need an O2 sensor?
Lately I've noticed that my fuel economy is getting pretty bad. There is also a coating of carbon soot on the inside my exhaust tips that can be wiped off with a finger. And the (under boost) knock counter has stayed at 0 for the last 4 or 5 tanks of fuel, but I guess that is a good thing. All of this indicates to me that the car is running too rich. Others (non-porsche people) have told me that the most likely cause, if the exhaust pipes are sooty, is a bad O2 sensor. Am I correct in assuming that everyone here is in agreement with that?
Since I don't have a lift, I don't do much under-the-car work, and I don't know exactly where the sensor is located. But I assume it has to be accessed from underneath. Is getting to it & changing it a relatively easy job (the underpanels are already off)?
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) Last edited by wild man; 10-12-2009 at 07:02 AM.. |
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10-12-2009, 06:56 AM
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Architect / Car Guy
Join Date: Jan 2009
Location: Atlanta, Ga
Posts: 699
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you know that A/F wideband i was talking about?
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Looking Forward to getting my First "car" Porsche 951 |
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10-12-2009, 09:51 AM
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That Guy
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Not that hard to change, its located on the crossover pipe right as it goes into the hotside of the turbo. In my opinion easier to change than the n/a sensor.
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Jon 1988 Granite Green 911 3.4L 2005 Arctic Silver 996 GT3 Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1 |
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10-12-2009, 10:43 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Quote:
At least it's good to know the the stock sensor is an easy change (i.e. very low "hassle factor"). Gotta do it soon though - I just noticed my plugs are starting to foul out. What is the NGK# to use? I think I will give them a try.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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10-12-2009, 03:17 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Never mind - I found the # - BPR6ES (normal heat range), and BPR7ES (one step colder). Considering the point we are at in the annual cycle, where on the planet I am located, and the fact that my engine temp gauge barely makes it out of the "white" zone, I will probably opt for the 6's now, possibly going 7 in the spring.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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10-12-2009, 04:11 PM
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Rogue Tuning
Join Date: Feb 2007
Location: Denver
Posts: 448
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A good "inbetween" range is using the non-projected tip plug:
BR6ES They are a little colder then the normal BPR6ES, but not as cold as the BPR7ES... -Rogue
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-Joshua www.RogueTuning.com |
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10-13-2009, 09:43 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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I already purchased the BPR6ES's, but I would like to try the BR6ES's, at some point. Thanks.
Anyways, I just discovered the problem. The O2 sensor was disconnected, probably because the connector was not properly secured in the holding clip. But since I don't know how many miles are on it, and the fact that a new one has already been purchased, I am still going to replace it.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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10-21-2009, 09:51 AM
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Registered
Join Date: May 2009
Location: Hawkinsville / Perry, Ga.
Posts: 1,239
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Hi Wildman, When you replace the 02 sensor, drop a weighted string down to tie on the new 02 wire to pull it back up. Makes life easier.
Cheers, Larry |
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10-22-2009, 10:36 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Thanks for the tip. I probably would have been swearing for quite a while before thinking of something like that.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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10-22-2009, 02:37 PM
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The Kraut Burner
The Bratwurst Burner
Das Boost
