ECM

[labtech_one]

before I undertake this project, I thought I'd ask if anyone else has had
this
problem. Here are the syptoms:

1) car starts poorly ( starts & dies, must keep pumping gas pedal )
2) check engine light comes on after the engine warms up some and
stays ON
3) car runs like crap, once it does warm up

I checked the error codes, and get ONLY an error 15 which indicates
"Coolant Temperature Sensor (CTS) - signal voltage is high"

I have replaced the temp sensor ( the one near the distributor ) 2 times
just in case of a 'bad' one ( so we've had the original plus 2 NEW ones in
there)
with no change. I inspected the wires as far back as I could in the engine
compartment
and have found nothing wrong ( no breaks or shorts )

In order to inspect further to the ECM I have to pull the inside of the car
apart,
so I ordered a new ECM ( rebuilt from the Fiero Store ) so I don't have to
tear it apart again or leave it torn up and risk loosing parts.

I'm working on a 1988 GT - V6, 5 spd ( with stock engine )

Am I missing something ? Is there another sensor that I'm not aware of ?
Any thing else besides the ECM that could be causing the problem ?


Thanks in advance

[Robert W Hughes]

the first thing you missed is the correct coolant temperature sensor -
there are four - one for the gauge, which you replaced, one for the fan
at the top front (passenger side) of the engine, a cold start switch,
and one for the ECM, sticking out the front of the block if I remember
correctly. It should be directly beneath the thermostat housing and the
connector will have a yellow and a black wire. There are other things
that can cause this code, like the connector being unplugged.

Post by labtech_one
before I undertake this project, I thought I'd ask if anyone else has had
this
1) car starts poorly ( starts & dies, must keep pumping gas pedal )
2) check engine light comes on after the engine warms up some and
stays ON
3) car runs like crap, once it does warm up
I checked the error codes, and get ONLY an error 15 which indicates
"Coolant Temperature Sensor (CTS) - signal voltage is high"
I have replaced the temp sensor ( the one near the distributor ) 2 times
just in case of a 'bad' one ( so we've had the original plus 2 NEW ones in
there)
with no change. I inspected the wires as far back as I could in the engine
compartment
and have found nothing wrong ( no breaks or shorts )
In order to inspect further to the ECM I have to pull the inside of the car
apart,
so I ordered a new ECM ( rebuilt from the Fiero Store ) so I don't have to
tear it apart again or leave it torn up and risk loosing parts.
I'm working on a 1988 GT - V6, 5 spd ( with stock engine )
Am I missing something ? Is there another sensor that I'm not aware of ?
Any thing else besides the ECM that could be causing the problem ?
Thanks in advance

[labtech_one]

I'll check it out .... THANKS

Post by Robert W Hughes
the first thing you missed is the correct coolant temperature sensor -
there are four - one for the gauge, which you replaced, one for the fan
at the top front (passenger side) of the engine, a cold start switch,
and one for the ECM, sticking out the front of the block if I remember
correctly. It should be directly beneath the thermostat housing and the
connector will have a yellow and a black wire. There are other things
that can cause this code, like the connector being unplugged.

Post by labtech_one
before I undertake this project, I thought I'd ask if anyone else has had
this
1) car starts poorly ( starts & dies, must keep pumping gas pedal )
2) check engine light comes on after the engine warms up some and
stays ON
3) car runs like crap, once it does warm up
I checked the error codes, and get ONLY an error 15 which indicates
"Coolant Temperature Sensor (CTS) - signal voltage is high"
I have replaced the temp sensor ( the one near the distributor ) 2 times
just in case of a 'bad' one ( so we've had the original plus 2 NEW ones in
there)
with no change. I inspected the wires as far back as I could in the engine
compartment
and have found nothing wrong ( no breaks or shorts )
In order to inspect further to the ECM I have to pull the inside of the car
apart,
so I ordered a new ECM ( rebuilt from the Fiero Store ) so I don't have to
tear it apart again or leave it torn up and risk loosing parts.
I'm working on a 1988 GT - V6, 5 spd ( with stock engine )
Am I missing something ? Is there another sensor that I'm not aware of ?
Any thing else besides the ECM that could be causing the problem ?
Thanks in advance

--
Robert W. Hughes (Bob)
BackYard Engineering
29:40.237N, 95:28.726W or perhaps 30:55.265N, 95:20.590W
Houston, Texas "The city with too much Oxygen"

[labtech_one]

The one by the thermostat house turned out to be the 'culprit'
a bit hard to see, but was no problem getting it out & replaced.
Nice part is the part ran just under $12 at a local parts store,
and took less than 2 hours to fix ( part run included )

Thanks for the help

Post by Robert W Hughes
the first thing you missed is the correct coolant temperature sensor -
there are four - one for the gauge, which you replaced, one for the fan
at the top front (passenger side) of the engine, a cold start switch,
and one for the ECM, sticking out the front of the block if I remember
correctly. It should be directly beneath the thermostat housing and the
connector will have a yellow and a black wire. There are other things
that can cause this code, like the connector being unplugged.

Post by labtech_one
before I undertake this project, I thought I'd ask if anyone else has had
this
1) car starts poorly ( starts & dies, must keep pumping gas pedal )
2) check engine light comes on after the engine warms up some and
stays ON
3) car runs like crap, once it does warm up
I checked the error codes, and get ONLY an error 15 which indicates
"Coolant Temperature Sensor (CTS) - signal voltage is high"
I have replaced the temp sensor ( the one near the distributor ) 2 times
just in case of a 'bad' one ( so we've had the original plus 2 NEW ones in
there)
with no change. I inspected the wires as far back as I could in the engine
compartment
and have found nothing wrong ( no breaks or shorts )
In order to inspect further to the ECM I have to pull the inside of the car
apart,
so I ordered a new ECM ( rebuilt from the Fiero Store ) so I don't have to
tear it apart again or leave it torn up and risk loosing parts.
I'm working on a 1988 GT - V6, 5 spd ( with stock engine )
Am I missing something ? Is there another sensor that I'm not aware of ?
Any thing else besides the ECM that could be causing the problem ?
Thanks in advance

--
Robert W. Hughes (Bob)
BackYard Engineering
29:40.237N, 95:28.726W or perhaps 30:55.265N, 95:20.590W
Houston, Texas "The city with too much Oxygen"