At least the head gasket hasn't gone then, that's what i was worried about.
The wideband lambda sensor has a separate interface between the sensor
and the ecu, it's a techedge one, i thought it was one of these
http://wbo2.com/3a1/3e1.htm with a built in display.
Is that reading the same as Megatune ?
There are some diagnostic indications on the similar unit here
http://wbo2.com/3a1/default.htm
I'm not sure the Lambda would make it run like it was on 2 cylinders though.
You could try turning closed loop off in Megatune just to see if it has
any effect.
You can't test the sensor easily but if you have the calibration cable
for the Techedge interface (not the megasquirt) then you could run the
calibration procedure to test it.
You are supposed to remove the sensor from the exhaust so it's in free
air for the calibration.
The you can squirt it with some gas from a lighter and the reading
changes (it's in the calibration procedure).
Again, i can't see the turbo would make it run like it's only running on
2 cylinders.
As Matthew said, it might be worth reloading the map into the Megasquirt
just incase it's managed to corrupt itself like it did once before.
Save the existing map first so you can always put it back.
Can you log some data from the ecu and email it to me, i might be able
to spot something wrong.
Jim
On 07/11/2015 22:31, Bob Craig wrote:
Latest update.
Compressions are all equal at 115psi which I'm assuming is ok with the
decompression plate. When I took the new plugs out to do the test they were
very sooted up after running the engine whil watching the Megatune. Megatune
was showing AFR of around 10, so very rich. Could a faulty lambda cause this.
I've read how to test the lambda out of the car using a blow torch and
voltmeter but it seems the 5 wire wide band ones are harder to test - anyone
tried it ?
It won't boost up to positive, just goes to 0 then backfires. Turbo issue maybe?
Bob
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