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-40 degree coolant reading. no o2 readings

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Old 06-25-2007, 11:54 AM
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Default -40 degree coolant reading. no o2 readings

this is on hp tuners. did a t56 to 400 swap and the above is what i am getting now. the car is idling erratically. i have checked at least 10 times to make sure the harness isnt pinched or wires are cut. when i did do the swap i found one of the cam sensor wires was pinched in between the motor and bellhousing. i fixed that.
Old 06-25-2007, 02:14 PM
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mind posting a scan to rule out a scanning issue?
Old 06-25-2007, 02:34 PM
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I bet the coolant sensor is bad. When the sensor is bad is reads way negative value and the car runs way rich.
Old 06-25-2007, 03:39 PM
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Originally Posted by speedracer5532
I bet the coolant sensor is bad. When the sensor is bad is reads way negative value and the car runs way rich.
would that cause the o2 sensors not to read also?

i do not have a scan at this time i had a friend over w/ his program
Old 06-25-2007, 06:11 PM
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check the "Eng Sensor" fuse
Old 06-25-2007, 08:29 PM
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i checked the fuse.

it is running very rich at idle

i did forget to say it is showing 64 degrees of retard at idle.
Old 06-25-2007, 11:06 PM
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Multiple sensor problems are either one of two things. Either God HATES you, or you have a bad ground. If I were you, I would check all of my ground wires.
Old 06-26-2007, 12:21 AM
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God hates know one..........., and yes i have checked and double checked the ground wire, fuses, volts to the sensors, resistance, pins on computer. i am going to replace the coolant temp. sensor and see what happens
Old 06-26-2007, 08:11 AM
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Originally Posted by red83
would that cause the o2 sensors not to read also?
Yes...if the PCM thinks the coolant is really cold it wont enter closed loop and it will just keep dumping fuel. Get that sensor fixed, and go from there.
Old 06-26-2007, 08:32 AM
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Originally Posted by Steel Chicken
Yes...if the PCM thinks the coolant is really cold it wont enter closed loop and it will just keep dumping fuel. Get that sensor fixed, and go from there.
Exactly, put a new coolant sensor in and I bet things will be good.
Old 06-26-2007, 08:40 AM
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Originally Posted by speedracer5532
Exactly, put a new coolant sensor in and I bet things will be good.
Ditto. I had the same issue last year, those sensors are pretty fragile. If they get knocked or something they are usually toast. Mine was running rich and surging at idle. Replace it before starting it again, don't wanna wash those rings down!
Old 06-26-2007, 10:30 AM
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i ordered one on monday. its just weird that it started when i did the swap, because i was not cloce to the sensor during the swap. ill change it and see what happens.

thanks for the replies




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