ECT Resistance?
ECT Resistance?
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New User
Joined: May 2007
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Thanks allot, I thought that maybe the thermostat may have been stuck open. Replaced it and still have very low tempeture on the gauge. I think that possibly I may have a faulty ECT now. Looks original. For less than 20 bucks, what the heck.
Thanks again,
Jim
Thanks again,
Jim
Post Fiend
Joined: Apr 2005
Posts: 5,720
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From: Washington state
temp gauge uses 1 wire sender
Aero's read near bottom of temp. scale which really has little meaning
PCM uses ECT 2 wire sender and has no connection to temp gauge
96 and later with OBDII will read out temp to accuracy of 1d F with scanner from ECT
Aero's read near bottom of temp. scale which really has little meaning
PCM uses ECT 2 wire sender and has no connection to temp gauge
96 and later with OBDII will read out temp to accuracy of 1d F with scanner from ECT
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I think I see now. The ECT I have with the single wire is only for temp gauge? Or the temp sensor I am looking at is different from the one I should be concerned with. I am getting trouble code for O2 sensor and running rich. I thought that maybe my temp wasn't getting up to proper level to run lean enough and causing a chain reaction giving my trouble code on the O2.
Guess I will look further into this.
Thanks,
Jim
Guess I will look further into this.
Thanks,
Jim
Elder User
Joined: Dec 2006
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From: Kitchener,Ontario,Canada
Originally Posted by KC8JPZ
I think I see now. The ECT I have with the single wire is only for temp gauge? Or the temp sensor I am looking at is different from the one I should be concerned with. I am getting trouble code for O2 sensor and running rich. I thought that maybe my temp wasn't getting up to proper level to run lean enough and causing a chain reaction giving my trouble code on the O2.
Guess I will look further into this.
Thanks,
Jim
Guess I will look further into this.
Thanks,
Jim
Is the engine running rich or the fuel trim is at adaptive limit rich ?
What is the code number ?
Elder User
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From: North Jersey, New Jersey
The Aero uses 2 temperature sensors the temp sensor with one wire coming from it is for the instrument cluster it has no other function.
The temp sensor with two wires going into it is the one the PCM uses.
If the sensor is faulty the PCM will assume that the engine is cold even after its warmed up and will run with a rich fuel mixture. Since the PCM is not getting the proper temperature feedback to adjust to a proper fuel mixture after warmup.
If you are running rich check out the PCM temp sensor first.
Here is a diagram of where it is:
The water temperature indicator sensor is what the instrument cluter uses that is not the one you want.
The one labeled ECT (Engine Coolant Temperature Sensor) is the one you want to check out. As you can see it has a 2 wire connector rather then the one connector on the instrument cluser sender unit.
The temp sensor with two wires going into it is the one the PCM uses.
If the sensor is faulty the PCM will assume that the engine is cold even after its warmed up and will run with a rich fuel mixture. Since the PCM is not getting the proper temperature feedback to adjust to a proper fuel mixture after warmup.
If you are running rich check out the PCM temp sensor first.
Here is a diagram of where it is:
The water temperature indicator sensor is what the instrument cluter uses that is not the one you want.
The one labeled ECT (Engine Coolant Temperature Sensor) is the one you want to check out. As you can see it has a 2 wire connector rather then the one connector on the instrument cluser sender unit.
Last edited by krankshaft; May 1, 2007 at 09:40 PM.
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Postmaster
Joined: Sep 2003
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From: Southern California
Hi KC:
Welcome to our Aerostar forum
To rehash what others have said, the ECT has 2 wires and it feeds the computer, not the gage.
The temperature sender is much cheaper ($5) and it feeds the gage on the panel. That one actually doesn't affect your engine performance at all. And yes, it does go bad, resulting in low reading on the gage, at least on more than one occasions on my car.
Welcome to our Aerostar forum
To rehash what others have said, the ECT has 2 wires and it feeds the computer, not the gage.
The temperature sender is much cheaper ($5) and it feeds the gage on the panel. That one actually doesn't affect your engine performance at all. And yes, it does go bad, resulting in low reading on the gage, at least on more than one occasions on my car.
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I am pretty sure the engine is getting up to temp. Just the PCM doesn't think so. I get plenty of heat from the heater and yes, the hose does get hot. Sounds like it may possibly be 2 temp sensors gone bad.I will let you all know what I find.
Thanks guys,
Jim
Thanks guys,
Jim
Post Fiend
Joined: Apr 2005
Posts: 5,720
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From: Washington state
clean the MAF and replace the O2 sensor if older than 50k miles
remove MAF element with Torx screws...soak in shot glass full of TB cleaner for 15>30 minutes...examine with magnifier lens....any dirt or crud sitll remaining=replace MAF
remove MAF element with Torx screws...soak in shot glass full of TB cleaner for 15>30 minutes...examine with magnifier lens....any dirt or crud sitll remaining=replace MAF
Elder User
Joined: Dec 2006
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From: Kitchener,Ontario,Canada
Originally Posted by KC8JPZ
I am pretty sure the engine is getting up to temp. Just the PCM doesn't think so. I get plenty of heat from the heater and yes, the hose does get hot. Sounds like it may possibly be 2 temp sensors gone bad.I will let you all know what I find.
Thanks guys,
Jim
Thanks guys,
Jim
Are the plugs black/sooty? whats your mpg's like ? Fuel pressure regulator? clogged air filter, leaking injector(s). MAP/ MAF sensors. If the ECU thinks your engine is too cold for closed loop it should give a code like 116 (coolant temp higher or lower than expected). Change the 2 wire sensor first.
Front O2 sensor could be faulty. Run the engine at idle ,warmed up for a few minutes & connect an high impedance ANALOGUE multimeter to the wires from the O2 sensor, I think the engine will still run in fault mode. Needle should swing from 0.1 to 0.9 volts AC. (this may happen quite quickly the meter may not be able to respond fast enough). If it is steady at above about 0.6-0.7 volts or higher, then replace the front O2 sensor.
Aeroman.
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From: Kitchener,Ontario,Canada
Originally Posted by Aeroman59
Are the plugs black/sooty? whats your mpg's like ? Fuel pressure regulator? clogged air filter, leaking injector(s). MAP/ MAF sensors. If the ECU thinks your engine is too cold for closed loop it should give a code like 116 (coolant temp higher or lower than expected). Change the 2 wire sensor first.
Front O2 sensor could be faulty. Run the engine at idle ,warmed up for a few minutes & connect an high impedance ANALOGUE multimeter to the wires from the O2 sensor, I think the engine will still run in fault mode. Needle should swing from 0.1 to 0.9 volts AC. (this may happen quite quickly the meter may not be able to respond fast enough). If it is STEADY (no switching) at above about 0.6-0.7 volts or higher, then replace the front O2 sensor.
Aeroman.
Front O2 sensor could be faulty. Run the engine at idle ,warmed up for a few minutes & connect an high impedance ANALOGUE multimeter to the wires from the O2 sensor, I think the engine will still run in fault mode. Needle should swing from 0.1 to 0.9 volts AC. (this may happen quite quickly the meter may not be able to respond fast enough). If it is STEADY (no switching) at above about 0.6-0.7 volts or higher, then replace the front O2 sensor.
Aeroman.
Aeroman
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From: Kitchener,Ontario,Canada
Originally Posted by 96_4wdr
no way to monitor LTFT on 95 Ford OBDI EEC-IV system
http://webpages.charter.net/eecanalyzer/Tuners.htm
http://www.tweecer.com/
Aeroman.
Last edited by Aeroman59; May 6, 2007 at 07:43 AM.
Post Fiend
Joined: Apr 2005
Posts: 5,720
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From: Washington state
out of most Aero DIYer price range
most 4L mudder, rock and creek crawler and logging road racers here convert over to a OBDII EEC-V harness, sensors and PCM
much easier to tune and troubleshoot
the EEC-IV stuff is disappearing quickly, almost no support
most 4L mudder, rock and creek crawler and logging road racers here convert over to a OBDII EEC-V harness, sensors and PCM
much easier to tune and troubleshoot
the EEC-IV stuff is disappearing quickly, almost no support
Last edited by 96_4wdr; May 6, 2007 at 09:31 AM.