Please Help once Again...O2 sensor?
Thread Starter
Cruising
Joined: Aug 2004
Posts: 13
Likes: 0
Please Help once Again...O2 sensor?
Ok,
I have been working on my vette for a couple of months replacing parts left and right.
This is my problem. Hard starting resulting in myself having to give the car gas to start. TPS sensor seems to of helped this though. But now when I am driving I get a O2 sensor lean condition after driving every time for about 5 minutes or less. I replaced all of the parts below and I am about to give up. Any ideas?
So far I have replaced:
Coolant temperature sensor
Map Sensor
Coolant temperature sender
Distributor cap
Ignition rotor
Ignition Coil
Ignition module
All spark plugs
O2 sensor
Fuel Injectors
Exhaust system
Throttle Position Sensor
Alternator
Battery
Battery Posts
PCV valve
Mobil Oil change
Thanks Guys!
I have been working on my vette for a couple of months replacing parts left and right.
This is my problem. Hard starting resulting in myself having to give the car gas to start. TPS sensor seems to of helped this though. But now when I am driving I get a O2 sensor lean condition after driving every time for about 5 minutes or less. I replaced all of the parts below and I am about to give up. Any ideas?
So far I have replaced:
Coolant temperature sensor
Map Sensor
Coolant temperature sender
Distributor cap
Ignition rotor
Ignition Coil
Ignition module
All spark plugs
O2 sensor
Fuel Injectors
Exhaust system
Throttle Position Sensor
Alternator
Battery
Battery Posts
PCV valve
Mobil Oil change
Thanks Guys!
Thread Starter
Cruising
Joined: Aug 2004
Posts: 13
Likes: 0
Sorry one more thing.
I had a problem with the alternator overcharging pretty much everything. Could it of messed up the computer?
Everything else works fine though.
The connections to the MAP sensor are fine, and I had the intake manifold gasket recently replaced. So.....what could be causing my car to go "lean"?
I had a problem with the alternator overcharging pretty much everything. Could it of messed up the computer?
Everything else works fine though.
The connections to the MAP sensor are fine, and I had the intake manifold gasket recently replaced. So.....what could be causing my car to go "lean"?
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
I doubt the problem is in the PCM. The computer is more like a light switch -it either works as advertised or it doesn't.
I also doubt that your past charging problems upset the electronics.
I reading about a lot of parts being thrown at the problem but not much in the way of diagnostics. But based upon what info you've provided, I'd say you have a fuel pressure issue.
If you have access to a fuel pressure gauge, hook it up and verify that you are in specs. I would not replace the pump or the regulator until I verified they were bad. If the fuel system checks out then you really need to read your datastreams to see what your sensors are doing and also verify the reference voltage.
I also doubt that your past charging problems upset the electronics.
I reading about a lot of parts being thrown at the problem but not much in the way of diagnostics. But based upon what info you've provided, I'd say you have a fuel pressure issue.
If you have access to a fuel pressure gauge, hook it up and verify that you are in specs. I would not replace the pump or the regulator until I verified they were bad. If the fuel system checks out then you really need to read your datastreams to see what your sensors are doing and also verify the reference voltage.
Thread Starter
Cruising
Joined: Aug 2004
Posts: 13
Likes: 0
I suppose the problem is poor diagnosis.
Im learning as I am going so I suppose that I will just keep trying.
Also the fuel pump was replaced. I wonder if they replaced it with the right one/way.
Also, how would I find out about my datastreams. What type of machine do I need to hook her up to?
Thank You
Im learning as I am going so I suppose that I will just keep trying.
Also the fuel pump was replaced. I wonder if they replaced it with the right one/way.
Also, how would I find out about my datastreams. What type of machine do I need to hook her up to?
Thank You
Instructor
Joined: Aug 2003
Posts: 147
Likes: 0
From: Augusta GA
When replacing parts "New" does not always mean good.
What you need for troubleshooting :
1.Download WinALDL program.Its free but make a contribution to support the site,please.
2.Buy the cable from one of the Supporting vendors like www.customefis.com for your laptop or make your own cable.
3.Look at cross-fire forum
What you need for troubleshooting :
1.Download WinALDL program.Its free but make a contribution to support the site,please.
2.Buy the cable from one of the Supporting vendors like www.customefis.com for your laptop or make your own cable.
3.Look at cross-fire forum
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Instructor
Joined: Aug 2004
Posts: 218
Likes: 0
From: Panama City Beach Fl
Pro
Joined: Sep 2003
Posts: 511
Likes: 4
From: Phoenix AZ
Originally Posted by no spin
http://www.crossfire.webhop.net/
You should be able to get more crossfire specific info here.
You should be able to get more crossfire specific info here.
Everyone with a crossfire should know about it.
I would also say, check for vacume leaks, verify fuel pressure, and check for corrosion on O2 sensor wiring.
Last edited by 82Vette'ster; May 21, 2005 at 12:28 AM.
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
Originally Posted by 82Vette'ster
Everyone with a crossfire should know about it.
I would also say, check for vacume leaks, verify fuel pressure, and check for corrosion on O2 sensor wiring.
