Intake air temp was 48
TPS = 0.55 v
IAC Position was 39
MAF 7.5/7.6 gm/sec
Running in Closed Loop. Wouldnt go into open loop ???
O2B2s1 Fluctuates from around 100 something to almost 800mv's
O2B2s2 443MV doesnt move at all....

Both O2's bad?

NO KNOCK RETARD AT ALL...

Does all that look good except the O2 sensors?

 

O2B2 S2 is the right side O2?

 

anyone??

 

Open loop is only when the vehicle is in cold start mode. Once the O2s warm up and are acting properly, then the vehicle goes into closed loop.

TPS @.55, I assume you were at idle.

Your other numbers look fine. The first O2 fluctuates as I posted in your previous thread. The second one will hang around 450 mv most all the time, which indicates proper cat operation.

 

Yes I was at Idle. So my O2's are working as they should be ?

 

I thought for the O2 sensors to work properly, their #'s have to bounce all over the place, regardless of how many there are?

 

All of those #'s are from Idle...

I did a few rev's as well and the one o2 sensor still fluctuates around and the other stays put at 443mv.. Is that how they are supposed to work? They are working as they should be ?

I had no knock retard at all throughout the rpm range....

 

Just ran to the store with my buddy, and now my car is running like total *** again... PO 300 came up twice again. Unhooked MAF still running like crap... What the hell, I replaced #3 and #5 wires, It seems they are arching at idle and through the rpm range, right at the plug boots/spark plug, you can see the white of the plug lighting up.... Also installed a NEW coil yesterday.. Should I go ahead and replace the rest of the MSD's ? or is the the frikin opti?

 

Please people help... Why would I get PO300 AGAIN?

 

is it possible for a plug wire to burn, even with a 1200 hi temp protector over it? I already relaced the cyl 5 wire. It best not be burnt again... How are you guys with SLP shorties (93 style) routing that cyl 5 wire???? its awlful close! Please someone help....

Whats the best way to do the pass side plug wires? Taylor 8mm, I'm stepping down from the extra crappy MSD 8.5's

 

You appear to have posted numbers for the passenger side pre-cat sensor (O2B2s1), and for the passenger side after-cat sensor (O2B2s2). It is normal for the pre-cat sensor to jump around from as low as 0xx to as high as 9xx mV. That is the nature of "closed loop".

As far as the after-cat sensor, it should be much more stable than the pre-cat sensor, but it would be odd for it to ALWAYS read 443mV. That might mean it is unplugged, has a wiring problem, or is "dead". But if it is bad, it won't affect performance.... it will just set a code/SES light.

Why did you only look at the passenger side O2's, when you appear to be having a problem with the drivers side... #3, #5? What are the drivers side O2's lookiing like?

If you see visible ARCING it's bad. A slight "glow" however, is not ARCING. That can be simply a high voltage corona. Is it possible you have loose plugs in those cylinders?

P0300 can be set by ANY kind of misfire.... plugs, wires, injectors, valves, a wild cam, etc. Have you checked the individual cylinder misfire counts to see if there are some cylinders that are misfiring more than others?

 

Those were the only o2's that came up on the scanner???? I dont even have the back 2 sensors anymore, They were to be deleted from the PCM. I have slight flickers right at the boot/plug its self... I did have a couple loose plugs but have tightend them and it still does this little flicker thing.. I'm lost.. I replaced my # 5cyl wire again and made 110% sure it will not burn again.. its running what I feel better again.... I can chirp into 2'nd... So as to the O2 sensors why is only the left side showing up?

Maybe that has something to do with my akward idle... The idle itself on the tach is fine, But I can feel a slight shake or stumble at idle...

 

On the scanner don't you select bank 1 sensor 1, bank 2 sensor 1, bank 1 sensor 2, bank 2 sensor 2? Or do all the sensors display with no activity for the ones deleted?

 

They may have deleted the after-cat O2 sensor "diagnostic" from the PCM, but not the actual ability for the PCM to read the sensor. If you have unplugged the after-cat sensor, it is going to read about +/- 450mV, because that is the voltage the PCM supplies to the connector.

With the scanner, you should have been able to step through all the parameters for both left and right sides, including O2 mV's, injector pulse widths, long and short term fuel corrections, etc.

 

I'll have to get my buddy to scan it again when he has time... so with the #'s of mv's flucuating like so, that is good?