FraserW

FraserW

Member
Hi all, in need of some help/guidance. I have a Range 4.2 v8 s/c petrol on a 56 plate. Having a cat issue with my em being on, bank 1 and 2 sensors have been tested and are functioning perfectly. Now the problem I’m having is no where does the cats for my year…all out of stock or don’t stock it. From what I can fathom is that on that year the exhaust is one piece? Manifold back. Later years being cat back. Am I being stupid here or will the 2007-2009 4.2 exhaust work being that’ll have to buy two cats and then cat back system?

I’ve got some cat cleaner coming but I’m not that hopefully it’s actually works.

P.s newbie here and this is my first post so cherry popped 😂 thanks in advance
 
Reduce efficiency bank 1 and 2. Can’t remember the code. But…regardless of codes I want to put an exhaust on it. Cat back but that doesn’t work with how the cats are on mine. So was thinking since I’m having this issue now could be a good time to get it sounding even better with a cat back stainless exhaust
 
Welcome to LZ.
I just wanted to say that although you are planning to renew the system anyway I’m sure that you’ll want the waning to be resolved.
I was also having MIL waning that recorded emissions on bank 1 then 2 but while using the car (also 4.2 SC but 2005) would clear itself.
Speaking to my independent mechanic he advised changing from Unleaded E10 to Super E5. Faults cleared and no return. Then had to fill with E10 and within 100 miles MIL warning and emission fault Bank 1.
Don’t know if anyone has a view on this but the mechanic said many cars are showing the same issue (as is my daughters 1.4 Corsa).
Please post your system replacement as I’m thinking of the same changes next year.
Cheers Tricky :cool:
 
That’s interesting. I will have to switch over and see if there’s a change my light does go off but very sporadically but soon reappears, at first I thought it may be a o2 sensor issue. Wonder what tre E10 is doing. Presume it’s not burning as clean?
 
FraserW said:
That’s interesting. I will have to switch over and see if there’s a change my light does go off but very sporadically but soon reappears, at first I thought it may be a o2 sensor issue. Wonder what tre E10 is doing. Presume it’s not burning as clean?
Click to expand...
Higher Ethanol content affects the energy value of the fuel. Lots of cars with modern sensors don't accept the high Ethanol content. Older cars it was just a case of tweak the timing.
 
I won't use E10, currently only have a 24 year old Focus, my preferred garage is a Shell one so I use V Power,
I even use it in the garden machinery.
 
I’ll fill up with some decent fuel on my next fill up (which won’t be long 😂) out of interest has anyone had any success with O2 spacers?
 
So a little bit further forward but no real change. I’ve ran some cat cleaner through and running on E5. Light has came back on after around 50 miles or so. I’ve plug the diagnostic tool in and looking at data streams for the upstream and down stream sensors bank 1 and 2 sensor 2’s voltage is pretty consistent and .75-.8 banks 2 sensor 2 being a little bit more changeable but staying with if .7 and .85. Sensor 1 on bank 1 and 2 are jumping all over the place anywhere from -95.53 up to 50.67 uA? Can anyone shed some light on what they are supposed to be doing. I would’ve thought they’d be more stable (sensor 1’s)
 

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FraserW said:
Hi all, in need of some help/guidance. I have a Range 4.2 v8 s/c petrol on a 56 plate. Having a cat issue with my em being on, bank 1 and 2 sensors have been tested and are functioning perfectly. Now the problem I’m having is no where does the cats for my year…all out of stock or don’t stock it. From what I can fathom is that on that year the exhaust is one piece? Manifold back. Later years being cat back. Am I being stupid here or will the 2007-2009 4.2 exhaust work being that’ll have to buy two cats and then cat back system?

I’ve got some cat cleaner coming but I’m not that hopefully it’s actually works.

P.s newbie here and this is my first post so cherry popped 😂 thanks in advance
Click to expand...
Back on to your exhaust topic, if you can’t find a good off the shelf brand, then try a specialised exhaust manufacture as there are a few about and from what I've seen in their websites are very well made in stainless steel and tune to your engine’s specification with a cat-back system, I you need both cats they provide and install as well.

It’s a shame that Janspeed may not be around now, they are or were a quality manufacturer exhaust systems.
My disco has a stainless cat-back system…now 14 years the rest of the exhaust is as it left the factory 🙂
 
Last edited:
FraserW said:
So a little bit further forward but no real change. I’ve ran some cat cleaner through and running on E5. Light has came back on after around 50 miles or so. I’ve plug the diagnostic tool in and looking at data streams for the upstream and down stream sensors bank 1 and 2 sensor 2’s voltage is pretty consistent and .75-.8 banks 2 sensor 2 being a little bit more changeable but staying with if .7 and .85. Sensor 1 on bank 1 and 2 are jumping all over the place anywhere from -95.53 up to 50.67 uA? Can anyone shed some light on what they are supposed to be doing. I would’ve thought they’d be more stable (sensor 1’s)
Click to expand...

I've no idea what microamps value to expect. iirc on the P38A it has a voltage. I'd expect both sides to be similar and vary slightly, especially as you blip the throttle.

As for the ethanol content. Ethanol burns slower so as Datatek said, older cars may need the timing advancing slightly. If you've switched fuel then maybe reset the fuel trims and take it for a ten mile run. I wouldn't expect too much difference in the composition of the gases down each pipe. Ethanol may cause more carbon monoxide or something like that but it should be the same both sides and if any engine could burn ethanol cleanly you'd think forced induction would do it.
 
FraserW said:
So a little bit further forward but no real change. I’ve ran some cat cleaner through and running on E5. Light has came back on after around 50 miles or so. I’ve plug the diagnostic tool in and looking at data streams for the upstream and down stream sensors bank 1 and 2 sensor 2’s voltage is pretty consistent and .75-.8 banks 2 sensor 2 being a little bit more changeable but staying with if .7 and .85. Sensor 1 on bank 1 and 2 are jumping all over the place anywhere from -95.53 up to 50.67 uA? Can anyone shed some light on what they are supposed to be doing. I would’ve thought they’d be more stable (sensor 1’s)
Click to expand...
I would guess if both sensors on one bank are playing up, then you need to check the supply and earth for them sensors, and compare to the other bank.
 
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