I just tried cleaning the outside of the lowest O2 sensor nearest to the colant leak. I used scotch bright and a hyrocarbo solvent (non chlorinated, non fluorinated, mostly hexane aerosol while it was cold).
I tried the OBD-II relearn procedure by warming up the engine, clearing the latest misfire codes, and then following the published relearn procedure steps (see the link in prior post of mine here).
I got all the way to locking in the final emissions monitors which were the catalyst "C" and the EGR "E" monitors. The other emission monitors locked in 5 to 10 minutes earlier with no problems including the oxygen sensor monitors, fuel system monitor, Misfire monitor, Oxygen heater sensor monitor, Comprehensive component monitor and the heated catalyst monitor. Shortly after which it threw its first misfire code at normal operating temperature in about 2 hours of run time tests at normal engine temeratures. It threw no codes before then or during a 15 minute stop and go drive test at speeds up to 50 mph, once it was warmed up.
Shortly after cold start up I checked the exhaust and again after running and driving it for over 30 minutes, and I saw and smelled nothing, NOTHING in the exhaust. Coolant bottle coolant level is rock solid, not going up or down after an hour of runing and driving.
At the begine of todays tests it cold started and threw two missfire codes, Cyl #2 and #5. Got the folowing Freeze frame data:
STFT B1 +32.81%
LTFT B1 +0.78%
STFT B2 +9.38 %
LTFT B2 +0.78
EDT = 78 F
Fuel sys 1 CL
Fuel Sys 2 CL-Fault
I shut it down, restarted it, cleared the codes, and it idled smoothly all of a sudden, at 1000 rpm in park, apx 110 F, for over 2 minutes with no DTCs, after which I drove it as described above. After 15 minutes of driving with no codes, after the last IM locked in, I got 3 separate cyl 1 missfire codes, after clearing the codes and reseting the monitors. Once a misfire code was set it never triggered any more misfire codes.
The last misfire codes had thi freeze frame data, which varies from one the next!
The fuel trims on this one were all negative, prior ones had been positive!!!!
(1) Cyl #1 misfire! With all I M monitors locked in and running.
STFT B1: -1.56%
LTFT B1: -10.94
STFT B2: -0.78 %
LTFT B2: -10.94
EDT = 203 F
Fuel sys 1 CL
Fuel Sys 2 CL-Fault
Vehicle speed = 0
RPM = 696
(2) Cyl #1 misfire! After clearing, and resetting the monitors, and clearing the DTC code for the misfire.
STFT B1: -1.56 %
LTFT B1: -9.38 %
STFT B2: -2.34 %
LTFT B2: -9.34 %
EDT = 215 F (I am not sure I beleive it is getting this hot, CTS sensor may off a bit, I never got over 195 F with an IR external sensor)
Vehicle speed = 0
36.08% load
RPM = 707 (Note all the missfires up to this point were ALL at idle!!!, May be programing lock out codes that do this)
(3) Cyl #1 misfire! With C E emission monitors still not locked in, the rest locked in and working.
STFT B1: -9.38 %
LTFT B1: +0.78 %
STFT B2: -9.38 %
LTFT B2: +0.78 %
EDT = 204 F
Fuel sys 1: OL - Fault (this was a first!!!!!!)
Fuel Sys 2: CL-Fault
Vehicle speed = 13 mph (this was first, always was at idle before)
RPM = 2349 RPM
80 % load
At this point, about half of all the misfire codes have been cyl #1, so I am going to try and look closer at that cyl tomorrow, but it is buried under stuff and will be very hard to get to. Not looking forward to it. I may try new plug wires as a desperate last attempt to avoid lots of disasembly work just to get to the rear spark plugs and injectors (1,2 & 3). I already love my Renix jeeps again, LOL.
Does anyone see a pattern in the data that I am missing so far????
I see the following differences, Fuel system #1 was typically Ok, but Fuel system 2 (I am guessing bank 2, and further guessing bank 2 is where cyl #1 is). Fuel system #1 read a single OL fault during the final missfire, after the car ran for nearly 30 minutes, a first so far. Prior to that it was normally CL with no fault during the missfires. THe consistant fuel faults on sys #2 make me suspect a leaking fuel injector on the bank 1,2,3 side, possibly #1, or week spark on that cyl on occasion.
I just figured one odd thing out. The service engine light (or MIL Malfunction Indicator Lamp) would on occasion flash, and on other occasions be on but not blinking, my scan tool manual says the light blinks when it is sensing the cyl misfire and it continues to blink during the misfire, if the missfire stops the MIL light stops blinking! I has been doing both, so now I know what it means when its flashing!!!!