Car runs rough when the engine is cold

[q0987]

Originally Posted by Jeff K

Some answers:

1> Is it true that both upstream sensors are same?
Because I can ONLY find one upstream O2 sensor from rockauto as follows:
More Information for MOTORCRAFT dy1039

Electrically they are the same, as are all narrow band O2 sensors are. In your case, I am thinking its the length of the wires coming out of the sensors that are different front to rear.

Many O2 sensors come with a dab of high temp antisieze on the threads. If your doesnt, use antisieze sparingly. DO NOT get any on or near the sensing tip of the O2 or you will be buying another new one.

Just chat with fordparts.com staff and he gave me the part number DY-1089, a blue one. I think he is wrong but who knows.
2000 Ford Taurus Oxygen Sensor | FordParts.com

Also he told me the both front and rear upstream sensors wires are of the same length.

From rockauto, the part number is dy1039, a green one.
More Information for MOTORCRAFT dy1039

[behlinla]

Yeah, blue is the downstream sensor. It will still work if the wires are long enough.

[q0987]

Originally Posted by behlinla

Yeah, blue is the downstream sensor. It will still work if the wires are long enough.

So basically, the guy from fordparts.com gave me the wrong information. But how Ford catalog can go wrong?

I have uploaded a video
Taurus 2000 SE O2 Sensor Location? - YouTube

As you can see @00:10 => blue connector
@00:23 => blue/green connector.

Still cannot find the other green upstream connector.

upstream sensor provided by fordparts:
2000 Ford Taurus Oxygen Sensor | FordParts.com

upstream sensor provided by rockauto:
More Information for MOTORCRAFT dy1039

[sheila]

Look down between the intake and firewall for the green elec. conn. and follow the wire.

[behlinla]

You found both of the bank 2 sensors. The bank 1 senors are on the other side of the engine between the engine and the firewall. This will give you an idea where to look:

[q0987]

I will check it later. It seems very difficult to reach and replace that sensor.

[sheila]

^ It is, lol!

[q0987]

Hello all,

Found one more issue today about my car.

I opened the oil cap and see it is very clean and no oil there. I assume this is normal.

Here is the bad part I found:
When I pull the oil stick and clean it and then pull back again, I found that the oil exceeds the MAX.

Assume the normal range is from
MIN <======>MAX
What I saw is
MIN <======>MAX===>

Is this a serious issue? I will get it fix on Monday morning since the shop doesn't open tomorrow.

Thank you

[sheila]

Get your drain pan and loosen the plug a bit until the oil begins seeping out. Recheck level.

[accuratemech]

Had a similar problem on 01 Vulcan. Crappy start and then OK after about 5 minutes. Had several misfire codes. Replaced all tune up parts and still had codes. Did cylinder compression test on 4, 5, and 6. Showed 90, 90, and 120. Pulled the front head and found cracks on 4 and 5. Put a used head on it and now OK. Seams like the cracks would close up when engine warmed up. Also when I tried to open the coolant tank cap coolant would overflow badly like it had pressure from exhuast. FWIW.