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89 930.
 
Benny771's Avatar
 
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Oxygen sensor symptoms......

Hello:
Seeing that i have no "scan" tool for the Porsche 1989 930. I was wondering how you know if it is working, and what the symptoms are of a bad Oxygen sensor?
Has anyone run into this?
I have had the car for 3 years now and dont know how old it was when i got it?
Is there a test for this?

Old 09-29-2010, 03:27 PM
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At operating temperature, Verify the duty cycle of the frequency valve, (diagnostic connector next to C.D. box), Do this using a dwell meter, During closed loop operation You will see a variable duty cycle and should confirm CO is within parameters,

But, Lambda sensors definitely have a service life, A replacement may be in the cards.
Lou / AERO DYNAMICS
Old 09-29-2010, 04:11 PM
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Good advice. Mine, on the other hand, is to trash the entire lambda. Well, we can't really trash it completely as the frequency valve running fixed in open loop is still needed, but you sure can unplug the O2 sensor and re-tune your car to run without it....and never look back.
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Old 09-29-2010, 06:43 PM
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Amen, Mark !

Lou / AERO DYNAMICS
Old 09-29-2010, 06:52 PM
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my car is also an 89 .would using a o2 sensor am I going to save on gas in cuty driving?
Thanks
Old 09-29-2010, 07:20 PM
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89 930.
 
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Quote:
Originally Posted by ertech View Post
my car is also an 89 .would using a o2 sensor am I going to save on gas in cuty driving?
Thanks
Prob. Yes...

I take it there is no idiot light on these to say that they are going.
Old 09-30-2010, 10:18 AM
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the symptom for my car was a horribly running 930. Unplugging it returned the car to stock drivability
Old 09-30-2010, 10:24 AM
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Quote:
Originally Posted by Benny771 View Post
Prob. Yes...

I take it there is no idiot light on these to say that they are going.
Yes there is. It works like this: You stomp on the gas, but that old VW bettle next to you still beats you off the line. You say to yourself "damn, this thing is running like $hit. That guy next to me must think I'm an idiot".

Unfortunatley without the benefit of EFI and ECU's for fuel management, there isn't any computer to tell you anything. Poor gas mileage, poor idling, poor performance is all you can go by.
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Old 09-30-2010, 12:10 PM
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^ what he said
Old 09-30-2010, 12:18 PM
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Thank-you all
Old 09-30-2010, 01:40 PM
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What is the cheapest o2 sensor to use if I use my original conector?
Thanks
Old 09-30-2010, 04:44 PM
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Quote:
Originally Posted by ertech View Post
What is the cheapest o2 sensor to use if I use my original conector?
Thanks
Bosch, if you search, ive seen them for 58$ at lagitimate stores.

Old 09-30-2010, 06:38 PM
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