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Join Date: Mar 2005
Location: Ellington, Ct
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Replaced oxygen sensor but no power
I own a 1985/2 955 with 149500 miles on it. The car failed the emision test. My CO was 5.11 and the limit is .64. I had the oxygen sensor replaced. Drove the car home from the shop and it ran great.
Went for a little ride and after the car warms up there is no power. Let the car sit all night and started right up and ran great until it warms up, then again feels like no power. What's up? Seems like it's running to lean. Thanks for the input.
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1985/2 - 944 Good ten foot car |
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05-05-2007, 09:58 AM
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winter-hater club member
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Location: salt lake city, utah
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hmm.... what were the rest of the numbers like?
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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05-05-2007, 10:09 AM
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O.K.
HC was 230 should be 200 and NOx was 590 should be 1400. Did not pass the HC but passed the NOx.
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1985/2 - 944 Good ten foot car |
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05-05-2007, 11:03 AM
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winter-hater club member
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Location: salt lake city, utah
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well, low NOx is not a problem.
i think the system that is supposed to lean out the engine when it is warmed up is not working and it is actually running too rich. hence, the high HC and the high CO. there is a temp sensor on the block at the front, just below the cylinder head, that you should test. i am sure others will have things to say.
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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05-05-2007, 11:20 AM
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The system I think was running rich before I got the emission test. The car ran very well that way.
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1985/2 - 944 Good ten foot car |
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05-05-2007, 12:35 PM
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winter-hater club member
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besides running poorly, what makes you think it is running lean?
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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05-05-2007, 01:05 PM
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You give it gas and you get nothing.
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1985/2 - 944 Good ten foot car |
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05-05-2007, 01:44 PM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
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perhaps it is an unrelated issue that popped up coincidentally with the replacement of the O2 sensor.
have you tried unplugging the new sensor?
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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05-05-2007, 02:21 PM
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Redline Racer
Join Date: Jan 2007
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could be running rich. i think I need a new O2 sensor as well. Mine would surge and feel lethargic around 5000-6500 rpms. It runs really solidly and is definitely stronger with the sensor unpluged and it gets almost 30 mpg instead of ~26. Hmm...I wonder if there's even a reason to get a new sensor?
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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05-08-2007, 08:30 PM
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Location: Ontario, Canada
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I love having wilk's chip...
dont need to worry about stuff like this!
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Kyle 2008 Mini Cooper // '83 Porsche 944 // '01 Mazda Protege [sold] // "Never break more than you fix!" - SoCal Driver |
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05-08-2007, 08:55 PM
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Location: Markham, Ontario, Canada
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Quote:
The reason it runs OK at start up is that it runs on predetermined fuel maps until the engine gets to the correct temterature range then it starts reading the O2 sensor, thats when you start having problems with driveability.
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Mark '86 944NA '10 VW Golf 2.5 5sp '99 BMW 540i Sport Wagon Last edited by mlue; 05-09-2007 at 02:59 PM.. |
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05-09-2007, 02:57 PM
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winter-hater club member
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Location: salt lake city, utah
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what does your air filter look like?
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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05-10-2007, 05:54 PM
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New 2 years ago.
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1985/2 - 944 Good ten foot car |
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05-11-2007, 05:16 AM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
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so, what you are saying is that it is OLD. (depending on miles driven, of course.) i personally don't go over one year without cleaning my K&N.
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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05-11-2007, 05:23 AM
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