Adam1984
Member
There are 2 sensors I believe yes
General Sensors, Oxygen and Engine Temp
- Thread starter Adam1984
- Start date
Currently reading:
General Sensors, Oxygen and Engine Temp
Mike1alike
Established member
Don't mind what you believe. Can you see them? If they are there, it's easy to see them, there's the electrical cable connected to them.
Adam1984
Member
I don't know where am looking sorry
- Joined
- Apr 22, 2018
- Messages
- 1,008
- Points
- 345
So why are you "repairing" this car?
If you can't count and name the sensors (how many, where, principle of operation)?
And make a useful graph, data log?
Fix one thing at the time. First of all: coolant temperature sensor / thermostat. If the temp. doesn't go above that "71 C".
Then we can talk about exhaust system. Maybe the coolant issue will fix the other things.
Check the spark-plugs and lambda sensors, visual check (what's the colour, how much sludge/residue there is).
By the way, part of the proper diagnosis is an exhaust emissions check.
You CANNOT "repair" the exhaust/combustion problem based on lambda sensors in the car! OK, sometimes you do.
You can fail the MOT with lambda 1,000. Go figure "why" (most people have no clue).
Most gas analyzers CALCULATE the lambda from other ingredients (02, CO2, CO, HC, NOx). Scientific formula.
The ingredients may be there, but not burned (and not converted) properly.
That's why lambda only is NOT enough to really fix a car.
OXYGEN sensor sees the RELATIVE oxygen content (relative to the ambient air). Based on that ECU assumes the cat. converter will do the job if the lambda floats around one (which is true in the healthy car, but not always, that's why you have obligatory MOT test).
If you can't count and name the sensors (how many, where, principle of operation)?
And make a useful graph, data log?
Fix one thing at the time. First of all: coolant temperature sensor / thermostat. If the temp. doesn't go above that "71 C".
Then we can talk about exhaust system. Maybe the coolant issue will fix the other things.
Check the spark-plugs and lambda sensors, visual check (what's the colour, how much sludge/residue there is).
By the way, part of the proper diagnosis is an exhaust emissions check.
You CANNOT "repair" the exhaust/combustion problem based on lambda sensors in the car! OK, sometimes you do.
You can fail the MOT with lambda 1,000. Go figure "why" (most people have no clue).
Most gas analyzers CALCULATE the lambda from other ingredients (02, CO2, CO, HC, NOx). Scientific formula.
The ingredients may be there, but not burned (and not converted) properly.
That's why lambda only is NOT enough to really fix a car.
OXYGEN sensor sees the RELATIVE oxygen content (relative to the ambient air). Based on that ECU assumes the cat. converter will do the job if the lambda floats around one (which is true in the healthy car, but not always, that's why you have obligatory MOT test).
Last edited:
Mike1alike
Established member
Adam1984
Member
- Joined
- Apr 22, 2018
- Messages
- 1,008
- Points
- 345
So learn how to use it. Take your time. Google the internet, forums, see how people use it, analyze the data.
Most do it wrong (they post a bunch of useless screenshots).
And give lame advice like resets (like "phonic wheel reset" was a cure for most problems).
You will not "fix" anything now (too early).
For example, your temperature reading "71 C" is useless without the context (other data): how long was the warm-up time, 5 minutes or 25, what's the RPM (dropped below 1000 or not).
Most do it wrong (they post a bunch of useless screenshots).
And give lame advice like resets (like "phonic wheel reset" was a cure for most problems).
You will not "fix" anything now (too early).
For example, your temperature reading "71 C" is useless without the context (other data): how long was the warm-up time, 5 minutes or 25, what's the RPM (dropped below 1000 or not).
Adam1984
Member
I am just going to get a new thermostat first with a sensor.
See if that changes anything
- Joined
- Apr 22, 2018
- Messages
- 1,008
- Points
- 345
It should help.
Then the exhaust issue will cure "itself" probably.
Then the exhaust issue will cure "itself" probably.
Mike1alike
Established member
After you put the new thermostat in you should do those resets, too.
Mike1alike
Established member
It probably will. But it's nice to have a proper recorded graph with the O2 sensors to see their values, anytime.
