INDALODUDE
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on r/r 1997 4.6 p38 plus got a missfire. no ex/blockage . glows red hot after only 3 mins
down pipes and both cats glowing red hot
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ratty
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on r/r 1997 4.6 p38 plus got a missfire. no ex/blockage . glows red hot after only 3 mins
It is usually a sign of the fuel mixture being too lean. In some cases though it can be running too rich but 9 outta 10 times it's cos it's too lean.
j the range
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as ratty said to lean could be mass flow or lamber sensers
Teflon
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That's got to be effing lean!
And its a cat-motor, so the lmabda shouldn't let it run that lean...
Something is very wrong, and I suspect, very expensive, cos although cats are designed to run hot, if they get THAT hot, then the catalyser core will be breaking down.
I wonder.....
Could be a 'reverse' effect symptom; if the cats have started to break down, and the Lambda is leaning the mix off becouse the cats aren't doiing thier job, and the Co readings its getting are too high, suggesting the fueling too ritch' so its leaning the injectors off to compensate, making it run hotter and burn the cats more.......
Suggest its a job for a diagnostics centre; get some sensor readings.
And its a cat-motor, so the lmabda shouldn't let it run that lean...
Something is very wrong, and I suspect, very expensive, cos although cats are designed to run hot, if they get THAT hot, then the catalyser core will be breaking down.
I wonder.....
Could be a 'reverse' effect symptom; if the cats have started to break down, and the Lambda is leaning the mix off becouse the cats aren't doiing thier job, and the Co readings its getting are too high, suggesting the fueling too ritch' so its leaning the injectors off to compensate, making it run hotter and burn the cats more.......
Suggest its a job for a diagnostics centre; get some sensor readings.
Beast o Bodmin
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petrol or lpg?
eightinavee
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Or he could just sort out the misfire and stop the unburnt fuel from burning in the downpipes/cats.
"Lambda is leaning the mix off because the cats aren't doing their job" I dont think so,the sensors are before the cats and will be shortening the pulse width of the injectors to try for a 5v signal,making the cyls that are firing as lean as can be.
phantom21
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Another reason could be that your timing has gone way retrded
Disco Moneypit
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