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97 Mystique 2.0L GS ECT intermittent
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Role
User
Jan 13, 2013, 3:36 PM
Post #1 of 19
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97 Mystique 2.0L GS ECT intermittent
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Hello,
Vehicle: 97 Mystique 2.0L GS
Problem: intermittent temp reading
Actions taken: replaced ECT, replaced wiring from ECT to harness connector.
Temp reads correctly until engine reaches normal temp and then gauge drops to cold.
Gauge does not drop to zero, close but gauge does not bottom out until key is off.
Secondary problem: New MAF makes engine run poorly, engine runs better with old MAF.
Any advice would be greatly appreciated.
Thank you.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 13, 2013, 3:45 PM
Post #2 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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Have you verified that you don't have air pockets in the system?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 13, 2013, 3:54 PM
Post #4 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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Open the radiator cap when it's totally cold and see if it is full to the top.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 13, 2013, 4:55 PM
Post #6 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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Yours likely has a pressurized tank so you are probably right and the level is OK.
I believe that engine uses a different coolant sensor for the gauge than it uses fir the computer.
Look for another sensor in the left side (front of car) of the head.
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Hammer Time
Ultimate Carjunky
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Jan 13, 2013, 5:34 PM
Post #8 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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I'm not sure what manual you are looking at but I have Alldata which is factory info and it keeps referring to an "instrumentation ECT sensor" and the wiring diagrams show different circuits.
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Hammer Time
Ultimate Carjunky
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Jan 13, 2013, 5:50 PM
Post #10 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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No, that's not possible. We pay serious money for accurate information.
There is another sensor there somewhere.
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Role
User
Jan 13, 2013, 5:52 PM
Post #11 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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Addendum,
It looks like circuit C1004 might be the problem.
Guess I will need to wait for the electrical manual.
Any ideas on the MAF situation I mention above ?
Thank you.
Edit: OOPS, C1004 is the connector to the instrumentation from the PCM/ECT...
(This post was edited by Role on Jan 13, 2013, 5:57 PM)
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Hammer Time
Ultimate Carjunky
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Jan 13, 2013, 5:55 PM
Post #12 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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Here I even have the different part numbers
Temperature Sensor (Gauge) Temp Sending Unit F5RZ10884A $44.70
Coolant Temperature Sensor/Switch (For Computer) Coolant Temp Sensor F5AZ12A648AB $29.04
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
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Jan 13, 2013, 6:22 PM
Post #14 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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Alldata says it's on the left rear of the engine.
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Discretesignals
Ultimate Carjunky
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Jan 13, 2013, 6:31 PM
Post #16 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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Are there any trouble codes stored in the PCM? Seems weird that the engine runs funny when the gauge drops.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
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Jan 13, 2013, 6:33 PM
Post #17 of 19
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Re: 97 Mystique 2.0L GS ECT intermittent
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That has nothing to do with the MAF. It's a mixture problem from something else. It just happens to run better in default mode.
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