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Thread: Oxygen Sensors, OL faults, and crazy volts Reply to Thread
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Topic Review (Newest First)
01-21-2013 10:02 PM
goinloco1 May want to go to the parts store and grab a can of maf cleaner. May take care of some of the other problems or at least smooth them out some. no telling how long its been since its been cleaned last.
01-21-2013 09:59 PM
goinloco1 my bad, missed that
got to reading everything else and musta skimmed it.
01-21-2013 09:47 PM
SanduskySerpents The erratic readings came from th OL fault and bad wiring. But it's fixed now. The car only has what I would call the usual stumble. It's not perfect but it runs
01-21-2013 09:41 PM
goinloco1 The downstream o2 does nothing but monitor the cat. If your getting wierd readings on it and your upstream your cat may be shot. your saying it runs like crap and isn't drivable also leads me this way.
By the way, stay away from bosch sensors, they are either crap right from the factory or burn up shortly. Definitely stay away from the bosch universals where you have to splice wires.
As was said, stick with oem.
01-21-2013 08:56 PM
SanduskySerpents Yeah I didn't solder them but I did use heat shrink over the connectors to weather proof.
01-21-2013 08:49 PM
amc49 Well I had that in there somewhere and redid my post since it wandered too much.


Point was, O2 sensor circuits are low voltage, when cut they need best connection possible, I've cut them before, preferable to solder them to prevent later humid conditions messing up the connection by corrosion, it doesn't have to be visible corrosion to cause trouble there.
01-21-2013 08:38 PM
SanduskySerpents When I rewired the o2 sensors they started functioning again. In all this mess I think I have solved it. Idle was ruff sounding like an overly aggressive camshaft were in it always about to die. I performed a smoke test after rewireing failed to fix everything and I found a that the EGR gasket failed catastrophically . After this I pressurized the cooling system a found 3 hoses leaking. Replaced gasket and hoses and it started idling 90% better. The unmetered air was causing it to go into open loop fault which just exasperated the problem.
01-21-2013 08:08 PM
1turbofocus Did you ever check the o2 fuses ? You wouldnt have a bad ECU for these issues and it doesnt surprise me your not getting any codes for this , check the o2 fuses

01-21-2013 08:04 PM
SanduskySerpents I know it's not a series circuit, just a a turn of phrase. I think I have it solved not sure yet. Update in a few
01-21-2013 07:54 PM
jetrinka Just trying to help...

The fact that the car isn't setting any codes and running so poorly gives me the gut feeling that something is wrong with the ECU or one of the power or ground feeds to it. The ECU will have several powers and grounds, not just one. It is not in a series circuit.
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