Hello to all
I have problem with my wife Peug 206cc it is 2.0L RFN engine 100KW
So far i have changed spark plugs, coil pack, cleaned injectors ultrasonic, check wires, relays, ECU and still is running rough at idle and when driving.
So please if anyone had similar issue give me some advice..
Is it possible to be that the middle silencer on the exhaust has small holes?
Petrol that I used is 100 octane
The codes that is dropped are P0351 and P0352.
Hello Gazza82
New coil pack Valeo, new spark plugs Bosch.
The problem that confuses me is the cylinders are working 1-3, 2-4. So how is it possible to drop the codes for the 1st and 2nd cyl?
Thanks for the answer
Btw they was the same codes with the old ignition coil and before changing spark plugs, also i had change the injector places 3 and 4 on 1 and 2. and still the same
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I'm back with more info. I had fixed the exhaust middle silencer. And still the same
here is photos from live data. The errors p0351 and p0352 are gone, now i have P0170 fuel trim malfunction bank 1 (the coolant sensor is reported but i had try to disconnected to see if there is change but still the same. the lambdas are working fine when engine cold but when gets little hotter they are dead.....any ideas ?
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Looking at your data and assuming engine at running temps, then I would start by replacing coolant temp sensor. This should sort your fuel trim too.
When the lambdas are *No responce*, I'm guessing they are dropping into O/L operation. They should respond it you increase rpm's
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Hello Col.
When i increase the RPM still lambdas are dead...no change just straight line...
Thank You for advice next is to change coolant temp sensor.
At about 2000+ RPM (steady throttle) the front sensor should be constantly switching rich / lean shown more or less as a sine wave on your graph. The rear sensor shouldn't really change much.
If your car was at operating temp, which is when live data is of most value, it shows coolant temp as quite low so ECU would be compensating with more fuel (fuel trim) hence my original suspicion that it looks slightly rich. This could have slightly coated / sooted up the O2 sensor so giving lazy reading as prob not hot enough (which is why you have heated sensors so they work quicker)
I suspect if you change coolant temp sensor, warm up engine and go for a spirited drive, the lambda will start behaving normally.
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