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interesting occurance

2K views 2 replies 1 participant last post by  skala 
#1 ·
Today drove first time with the 6.1 hemi SRT air intake tube fitted to the 5.7 hemi. All seemed fine until after about 30km travel the MIL light came on and the MDS stopped working.

Checked error codes with Torque Pro and gave an orange code P0133 Powertrain; O2 sensor circuit slow responce Bank 1 Sensor 1
plus a grey code P0128 Powertrain; coolant thermostat (coolant temp below thermostat regulating temp)

I did not constantly check the O2 sensors whilst driving, but what I did see did not seem to show a problem. Saved the faults in the log and cleared. Drove short distance later and MDS works plus no MIL indication.

Some background. There is a 203F that is 105C thermostat fitted, but I drilled a 4.5mm hole in the rim allowing coolant to circulate before thermostat opens because coolant temp was regularly over 100C up to 110C in summer. Now it is winter and coolant temp today only reached 92C. I do not know what the temp operating setting presently is, will let my tuner look with the HP Tuner. I have just obtained a 190F that is 88C thermostat that I will now fit.

I cannot see that fitting the SRT air intake could contribute to the faults and MIL warning. Maybe the O2 sensor is going bad.

Will monitor and give feedback.
 

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#2 ·
Ok, update on the O2 sensor slow response.
Checked for exhaust and manifold leaks on cold engine. No leaks.
Swapped front and rear sensors around. Al 4 still looks good.

After driving about 15km, MDS stopped engaging, but no MIL light.
Using Torque Pro indicated again O2 bank 1 sensor 1 slow response. So, having swapped this sensor to the rear position, I am now stumped. What could be the problem?

Came home and cleared the PCM memory banks so new learning can start. Will see what the effect if any of this will be.
 
#3 ·
Solved the O2 slow response bank 1 sensor 1. Apparently this fault code is very common, since these Jeep electronics is very sensitive. Thought about this and did a special memory clear on the PCM. This seems to have solved the fault being generated.
I think it arose due to difference in air flow and this upset the mixture readings stored in the memory. Now PCM and ECU will learn to read the new values and hopefully stay happy.
 
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