Plz Help me identify this unattached hose next to the Oil Stick and Disa Valve

[X5chemist]

Wow! How old were those spark plugs? The ceramic burn through was really bad. Those are some of worst I've seen.

What is the MAF reading when it's plugged in? Reading in grams/sec. It should be close to engine size at operating temperature. The sensor could be bad. Is it an OEM old one? If it's very old, replace it or borrow one to try out. The orange glue looks like sensor "coating". I have not look at one closely but it should be normal unless it looks burned.

When everything is working properly, front O2 sensor voltages should cycle up and down. The rear O2 sensor should read steady voltage. The rear voltage will change with idle RPMs but stay mostly flat at constant RPM. If rear O2 voltages mimics front O2 cycling, there's a problem.

[shevin]

Originally Posted by X5chemist

Wow! How old were those spark plugs? The ceramic burn through was really bad. Those are some of worst I've seen.

What is the MAF reading when it's plugged in? Reading in grams/sec. It should be close to engine size at operating temperature. The sensor could be bad. Is it an OEM old one? If it's very old, replace it or borrow one to try out. The orange glue looks like sensor "coating". I have not look at one closely but it should be normal unless it looks burned.

Thank you very much @X5chemist you are amazing,
I have had this car for 8 years and 83K miles and never changed them (they are at least 100K miles or could be original...who knows ! the fuel filter that I just change was made in 2003 !!! )

I will barrow a MAF sensor to see if it will fix it,
Btw, when MAF is not plugged in I get these Two errors, are they both normal for MAF disconnected?

1 - 08 Signal, Air-mass Flow Sensor (I expected this one)
2- CC plausibility idle speed (leakage air) P0505 - **** the Second one looks scary ***

Originally Posted by X5chemist

When everything is working properly, front O2 sensor voltages should cycle up and down. The rear O2 sensor should read steady voltage. The rear voltage will change with idle RPMs but stay mostly flat at constant RPM. If rear O2 voltages mimics front O2 cycling, there's a problem.

I will try to see if I can detect any iregularities, but I changed the oxygen sensors 2-3 years ago, so I think they should be fine.

Originally Posted by X5chemist

What is the MAF reading when it's plugged in? Reading in grams/sec. It should be close to engine size at operating temperature.

What measurement should I look at for Gram/sec ? in the ECM data stream there are these numbers when MAF plugged in:


Oxygen sensor controller bank 1 - 0.97
Oxygen sensor controller bank 2 - 1.27
Signal oxygen sensor bank 1 before cat 0.01
Signal oxygen sensor bank 1 after cat 0.02
Signal oxygen sensor bank 2 before cat 0.01
Signal oxygen sensor bank 2 after cat 0.02
adaptiation mixture additive bank 1 (ms) 0.00
adaptiation mixture additive bank 1 (ms) 0.00

adaptiation mixture mixture bank 1 multiplicative % 0.87
adaptiation mixture mixture bank 2 multiplicative % 0.89