#1: Inlet Air Temp and Coolant Temp Author: Berth, Location: DenmarkPosted: Sat Nov 22, 2014 2:01 pm ---- Hi
My 2000 GTI138 failed its MOT with a CO in idle on 1,1% and 1,2% High Idle(2500rpm)
I put my PP2000 on today to see if anything was obvious
My Downstream oxygen sensor is constant at 0mV
But i think that it might be caused the to other odd reads from PP2000
air temperature is ~59C
Coolant temperature is 46C
Both stays at the same level +/- 1
I had the car running idle for 10 min with the bonnet open and outside temp was around 5C
The tempgauge was between 70-90C
Are the sensors dead?
Is air temperature the Temp sensor in the throttlebody?
#2: Re: Inlet Air Temp and Coolant Temp Author: heyziq, Location: MalaysiaPosted: Sat Nov 22, 2014 2:13 pm ---- if urs are 2000 model then u only have 1 o2 sensor, or u have older type ecu which have 1 sensor... i have this type too
#3: Re: Inlet Air Temp and Coolant Temp Author: Berth, Location: DenmarkPosted: Sun Nov 23, 2014 2:31 am ---- I have Two O2 sensors, one before the cat and one after, the car is from 10/2000 with RFN engine
#4: Re: Inlet Air Temp and Coolant Temp Author: macj, Location: EssexPosted: Sun Nov 23, 2014 5:29 am ---- If you were sitting at idle for that long there is a good possibility that air temp is getting high from the engine bay heat.... coolant temp sensor is probably no good as it should be nearly double that. I would try that one first
#5: Re: Inlet Air Temp and Coolant Temp Author: Edward, Location: In the garagePosted: Sun Nov 23, 2014 8:32 am ----
heyziq wrote:
if urs are 2000 model then u only have 1 o2 sensor, or u have older type ecu which have 1 sensor... i have this type too
Not as simple as that. RFN coded cars are from 2000 onwards and have two sensors. Earlier RFR cars just has one.
#6: Re: Inlet Air Temp and Coolant Temp Author: Addaz, Location: SuffolkPosted: Sun Nov 23, 2014 10:46 am ---- Was your lambda open or closed loop when you registered 0mv?
Intake sensor sounds dodgy, what does it register with the car no running? Do you have a gay intake on it though?
#7: Re: Inlet Air Temp and Coolant Temp Author: kandlbarrett, Location: SwindonPosted: Mon Nov 24, 2014 6:45 am ---- If you can do a live drive test. lambda sensors should be voltage switching rapidyly.
#8: Re: Inlet Air Temp and Coolant Temp Author: Berth, Location: DenmarkPosted: Mon Nov 24, 2014 1:37 pm ----
Addaz wrote:
Was your lambda open or closed loop when you registered 0mv?
Intake sensor sounds dodgy, what does it register with the car no running? Do you have a gay intake on it though?
I Think it was in open loop hence it didnt registeret anything, where would it show open/closed loop?
What determine if open or closed?
I have tested both o2 censors with a voltmeter, While car running in idle both registers between 0,1 and 0,8 volt
I have a new intake temp sensor on the way, and a new cooling temp sensor
Intake is standard with kn panel
#9: Re: Inlet Air Temp and Coolant Temp Author: Berth, Location: DenmarkPosted: Mon Nov 24, 2014 1:39 pm ----
kandlbarrett wrote:
If you can do a live drive test. lambda sensors should be voltage switching rapidyly.
Live drive test has to wait a few days as i am fixing my front brakes as well
Could it be that exhaust isnt hot enought when just running idle?
#10: Re: Inlet Air Temp and Coolant Temp Author: Berth, Location: DenmarkPosted: Mon Nov 24, 2014 2:30 pm ---- I got this screendump from yesterday with the o2 sensors reading
downstream sensor states 0mV but in the infobox in the bottom it states that in open loop it should be between 0,1v and 1,0v
#11: Re: Inlet Air Temp and Coolant Temp Author: Berth, Location: DenmarkPosted: Tue Dec 09, 2014 10:22 am ---- Still have an issue with to High CO
I have a Maniflow 4-2-1 exhaust with a 200cell cat
The first o2 sensor is placed in the manifold where Two pipes join, is this right or do i need to move it to a location where gas from all 4 cylinders Will reach?
#12: Re: Inlet Air Temp and Coolant Temp Author: kandlbarrett, Location: SwindonPosted: Tue Dec 09, 2014 12:01 pm ---- Whilst less than perfect this shouldn't cause a problem. Though it does mean that lambda is only reading two cylinders and the second is reading all 4.
In cars with the pre cat lambda reading two cylinders there is usually a pair of pre cat lambdas each reading two cylinders but, as already said, if the car is running correctly this shouldn't be a problem though it will make diagnosis a little harder.
With your readings (voltmeter suggests lambda is OK but PP say different) I would start to suspect broken wire or poor connection.
Does it give an output on PP at any throttle position? If not but your meter is showing it giving an output then it is almost certainly broken wire or bad connection.
#13: Re: Inlet Air Temp and Coolant Temp Author: 206gt160, Location: BlackburnPosted: Tue Dec 09, 2014 12:05 pm ---- That manifold is beautiful
#14: Re: Inlet Air Temp and Coolant Temp Author: Berth, Location: DenmarkPosted: Tue Dec 09, 2014 12:39 pm ----
kandlbarrett wrote:
Whilst less than perfect this shouldn't cause a problem. Though it does mean that lambda is only reading two cylinders and the second is reading all 4.
In cars with the pre cat lambda reading two cylinders there is usually a pair of pre cat lambdas each reading two cylinders but, as already said, if the car is running correctly this shouldn't be a problem though it will make diagnosis a little harder.
With your readings (voltmeter suggests lambda is OK but PP say different) I would start to suspect broken wire or poor connection.
Does it give an output on PP at any throttle position? If not but your meter is showing it giving an output then it is almost certainly broken wire or bad connection.
When running the car with PP the upstream Sensor switches between 50mV and 900mV but not as rapidly as i would expect
The Downstream sensor stays at 0mV - this sensor is 4 month old but is a noname product.
I Will try to switch the Two sensors just to see if i Can get a Reading from the Downstream
#15: Re: Inlet Air Temp and Coolant Temp Author: Berth, Location: DenmarkPosted: Tue Dec 09, 2014 12:40 pm ----
206gt160 wrote:
That manifold is beautiful
And the car runs great, besidde this issue, and Sound good and loud
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