What if O2 sensor is bad? - Team Camaro Tech
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post #1 of 11 (permalink) Old Mar 25th, 03, 08:07 PM Thread Starter
 
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What whould my car run like if my O2 sensor is bad? this might be a step to why my car wont sart???

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post #2 of 11 (permalink) Old Mar 26th, 03, 10:18 AM
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In general you may not notice much of a difference in drivability. You will notice a decrease in your gas mileage, hard starting, and at times an eratic idle.What type of vehicle is this?

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post #3 of 11 (permalink) Old Mar 26th, 03, 11:37 AM
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Keep it all in one thread! Post a response to your last thread, don't start a new topic for the same question!

And, no, the O2 sensor has nothing to do wth the way your engine starts. The O2 sensor doesn't even get looked at by your engines computer until the water temperature comes above 135 degrees F.

We told you once already, it sounds like you have a fuel pressure problem. If you don't want or trust our advice, why did you ask??

Paul D.

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post #4 of 11 (permalink) Old Mar 26th, 03, 01:44 PM Thread Starter
 
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ok, I dont what to come off rude, but i have a whole buch of problems with this car, and i wasnt posting a REPLY, I was asking another qustion about a different topic, so really i dont feel i am did anything wrong, you have to realize where im coming from, i just bought this car and there are soooooo many things bypassed and riged on it from the pervious owner, im just trying to get it right...and, at the same time, this is my fisrt chevy with a a computer...i dont mean to **** anyone off, i just need ALOT of DIFFERENT qustions answered....i have 2 different manuels, and am going through the car as best i can...ok, i'll ask another qustion here so no one get mad...looks like the fuel relay switch went bad and someone riged the hell out of it with a wire from the coil to the pump..."so it would come on when the key is in" now that i know this i need to find the fuel relay switch..i have 2 mauels and i can find the darn thing!!!anyone know?

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post #5 of 11 (permalink) Old Mar 26th, 03, 03:35 PM
 
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Talking

Try asking the "pervious" owner......
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post #6 of 11 (permalink) Old Mar 26th, 03, 03:48 PM Thread Starter
 
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got it from a tow yard, as a lein sale..my dad owns a shop, so i have been down there every day working on it, he paints, but alsot does resots..hes a mustang man thoe...thats why my help is kinda limted....

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post #7 of 11 (permalink) Old Mar 26th, 03, 04:31 PM
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Greeting,

I have a GM service manual for the 1989 series camaro's and will be happy to e-mail you some information on your car since there is not a heck of a lot of difference between the two years. In regards to where the fuel pump relay is mounted, it is on the drivers side firewall in the engine compartment. Let me know if you would like this info. [img]graemlins/beers.gif[/img]

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post #8 of 11 (permalink) Old Mar 26th, 03, 04:41 PM Thread Starter
 
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thanks, i'll try to replace the relay, if that dont work, well be talking! thanks alot!

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post #9 of 11 (permalink) Old Mar 27th, 03, 12:11 AM
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Someones had too much caffiene [img]tongue.gif[/img]

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post #10 of 11 (permalink) Old Mar 27th, 03, 01:49 AM
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Not ****ed off, just trying to understand where you are coming from. It sounded like the same question for the third time.

That's a sad story! Junk yard refugees are always an SOB to get squared away.

Ask all the questions you can and everyone on the board will try to offer what help they can.
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post #11 of 11 (permalink) Old Mar 28th, 03, 01:13 AM
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Well to answer your question an O2 sensor won't make your car start hard. Your car has a single wire, non heated O2 sensor that doesn't even come into play with the ECM until the engine is warmed up and the ECM goes into closed loop.
If the O2 sensor goes bad it will set a "check engine" or "service engine soon" light. The light may come on and go out with each key cycle (ignition cycle) but a fault code will be stored in the ECM. If the O2 sensor is bad the ECM will default to a set "value" which will still allow the engine to run. The purpose of the O2 sensor is to monitor the fuel/air ratio of the engine and make corrections to add more fuel or lean the engine out. An old 1 wire (non heated) O2 sensor may go into open loop (does not provide input data to the ECM) while the engine is at idle because the exhaust gases aren't hot enough, thus the reason vehicle mfgs. went to the heated O2 sensors which may have 3 or 4 wires attached to it.
Hope this makes sense to you.

Drew<br />69' X-11 Coupe
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