Range 4.2 v8 s/c exhaust

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

Hi and welcome
What error codes do you have?

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

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?

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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.

There has to be different chemicals in an e10 exhaust, perhaps sensors and catalytic converters don't like that

kermit_rr said:

There has to be different chemicals in an e10 exhaust, perhaps sensors and catalytic converters don't like that

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Only Ethanol as far as I can see.

Datatek said:

Only Ethanol as far as I can see.

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But what does that breakdown to during combustion, compared to petrol? The exhaust must have a different chemical makeup

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)

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

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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

aj1954 said:

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.

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I just followed on from 5️ and use the highest octane rating what ever the brand.

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)

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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)

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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.