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So just the other day I bought be this new truck. We'll new to me I drove it for a day and then the check engine light came on. I got my actron scanner out pulled the code and got P0430 cat not performing right bank 2. So I did some research and I can a test on my scanner to see if my o2 sensors were working along with the cats. The results were that the cats get up to about 1500 degrees so I know they are heating up like they should and the o2 sensors were bouncing from 4/5 mA to 250 mA and the downstream ones were at about .7 .8 V. The mA looks a little low since I have read they can go anywhere from 200 to 800 and the downstream voltage seems a little high shouldn't they be around .5? I'm not a mechanic so any and all help would be appreciated.
You don't say what engine, but I suspect you have the 3.5 ecoboost, correct??
With that said, your problem is deeper. If you are getting that code, change cats and o2 sensors. Next, change spark plugs to motorcraft sp534 gapped to .030. Then, drill the 1/16" weep hole in the intercooler. The reason your cats and o2 sensors failed was because of engine misfire (caused by condensate in the intercooler) and raw fuel passed through exhaust. The weep hole allows the condensate to escape before it blows out spark.
put in a bank 2 catalyst and be done with it. i assume this is a 3.5 turbo? my parts dept keeps them in stock as they can be quite common to replace.
also, depending on the year of truck and its mileage be sure that the component is not still covered by any emissions warranty.
p0420/p0430 codes almost inherently imply that the downstream oxygen sensor on the bank in question functions properly.
some basic technical background info for those reading about 'current' on modern air:fuel sensors ...
as for current readings on the upstream sensors - these are wideband 02 sensors. proper scan tools give readings from these sensors in a few different ways. EQ_RAT (number or ratio) is the reading we want to concentrate on for wideband sensors. conversely, the current reading of the wideband sensor's oxygen pump (expressed as mA) is thoroughly useless from a diagnostic perspective.
when EQ_RAT is expressed as a ratio the target should be stoich for that particular fuel. for most gasoline blends we wast to see 14.7:1. for E85 we want to see richer than that, closer to 13:1.
when EQ_RAT is expressed as a number then it is referring to lambda. a value less than 1 is rich relative to stoich. more than 1 is lean relative to stoich.
again, the current readings are almost exclusively ignored from a diagnostic viewpoint.
This is not good for the ecoboost... these cat/o2 failures prove that the condensate misfire is a widespread epidemic.
nah.
of all the ones i've pulled apart i've never seen one loaded with water through the CAC. granted, my locale is rather dry and is not a large proponent of relative humidity. nonetheless, there is a tsb in place to put a shield in front of the CAC to reduce its efficiency and handle moisture buildup. it is an issue that was mitigated early on in the engine's life.
misfires are common though. high combustion pressures due to the turbos make it difficult to keep the voltage from straying in the secondary ignition system. carbon tacking is common on the spark plugs and coil boots. this leads to misfire under heavy load in most cases. honestly, there's not a lot to be done other than replacing plugs and boots roughly every 50 000 km.
also, cold weather fueling strategy at startup is not helpful. the nature of direct injection has these things flooding easily when the ambient temps are at -20 celsius and colder. at -40 they are a bear to start. extra fuel tends to wash past the rings and accumulate in the crankcase growing the oil level and generally causing rich running.
both of these cases - fuel in the oil and ignition misfires - tend to take out the cats. that being said, for the amount of them that are out there on the road i've repaired relatively few. and living in the north of canada where pickups are king, there is a disproportionately high amount of these things on the road. hell, i've done more stretched primary timing chains and front cover oil leaks than i've done catalysts and CAC TSBs combined ; )
That is correct- you won't see anything when you pull the intercooler because it is pushing any buildup through spark path and exhausting it. The weep holes allows a path for it to get out pre-spark. Hence, no misfire, no bad cats, no bad o2 sensors.
Thanks you all for the information.... It seems a like a lot might be going on... But it's not the 3.5 eco it's the 5.0 v8 do the same problems happen in the 5.0? It had 138xxx on it I was thinking o2s were bad but may need new spark plugs? The cats probably bad regardless?
Also I may add when the truck is idling it's very
Hard to detect a misfire from just listening to it.
Since it's saying the cat isn't performing then that means that its getting the code from the downstream sensors. Before replacing anything swap the downstream sensors side to side, clear the codes and see if the code comes back on the same bank or has moved to the other. This will tell you if it's the cat or the sensor that's bad.
That is a great idea I will try it when the weather breaks a little it's being raining ice here the last few days....
Would the think that guy mentioned about the water build up happen in the 5.0 too? I do here a slashing of water and im not too sure where it's coming from most of the time when the cars cold and I'm taking of from a stop
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