Engine Management Light after Larini Cats and BMC Air Filter

[Mr_MC_SportLine]

So, I had the new Larini Sports CATS fitted last week at SB Race Engineering and a new BMC air filter. Car is sounding fantastic and is exactly what I was looking for from the upgrade. The issue now is after a few days I noticed the engine management light pop up and wont clear. I checked the fuel cap as I know this can sometimes cause problems but I dont know how to tell if its in need or replacing or not? Im going to take it back to SB for them to check it over and check the code but wanted to know if anyone else has/had this following Larini cats or BMC filter replacement. Thanks all.

 

[voicey]

It will likely be due to reduced catalytic converter efficiency - post up the codes and we'll know for sure.

If it is then I have a solution for cheap money.

 

[Mr_MC_SportLine]

It will likely be due to reduced catalytic converter efficiency - post up the codes and we'll know for sure.

If it is then I have a solution for cheap money.

Thanks, I will post them as soon as I have the info. Is this a "do it yourself" fix or will it need to go in to a specialist? Cheers

 

[CatmanV2]

Thanks, I will post them as soon as I have the info. Is this a "do it yourself" fix or will it need to go in to a specialist? Cheers

I suspect it's a lambda sensor extender, so it'll depend on if you're happy on undoing the existing ones screwing in the spacers, then screwing the sensor into that.

Of course I could be utterly wrong!

C

 

[voicey]

I suspect it's a lambda sensor extender, so it'll depend on if you're happy on undoing the existing ones screwing in the spacers, then screwing the sensor into that.

Of course I could be utterly wrong!

C

Close - it is a miniature catalytic converter that screws into the boss of the exhaust. The lambda screws into the back of the mini-cat so it senses exhaust gas that has been catalysed by both the sports cats and the mini-cat. This is enough to produce an acceptable signal for the ECU.

I have them made to my specs and buy them in bulk.

 

[Contigo]

I have the Sports Cats on mine there should be no EML light on! If here is do a battery reset and take it for an Italian tune up and report back please.

 

[CatmanV2]

Close - it is a miniature catalytic converter that screws into the boss of the exhaust. The lambda screws into the back of the mini-cat so it senses exhaust gas that has been catalysed by both the sports cats and the mini-cat. This is enough to produce an acceptable signal for the ECU.

I have them made to my specs and buy them in bulk.

Clever! Thanks for the clarification (as always)

C

 

[Swedish Paul]

Close - it is a miniature catalytic converter that screws into the boss of the exhaust. The lambda screws into the back of the mini-cat so it senses exhaust gas that has been catalysed by both the sports cats and the mini-cat. This is enough to produce an acceptable signal for the ECU.

I have them made to my specs and buy them in bulk.

Isn't that a cheat device?

 

[voicey]

Isn't that a cheat device?

Yes in that it is fooling the ECU into thinking that the exhaust gas is being catalysed more than it actually is.

 

[Swedish Paul]

If you took the car for an m.o.t. And they measured at the exhaust rather than through ODB, would it still pass?

 

[Swedish Paul]

Also, I presume this is a way to tune for more power? Or?

 

[voicey]

Most sports cats are enough to pass an MOT.

Sports cats are usually fitted for more power and/or noise.

Modern ECU programming is such that the catalytic converter efficiency is monitored very tightly - any hint that it isn't functioning correctly and a CEL will be thrown. The more modern the car, the tighter the monitoring. For the F430 for example, a 2005 car will be more tolerant than a 2008.

Whilst it is useful to know if the cat is working properly, if one intentionally reduces the amount of catalyst then it is more useful to stop the monitoring alarms from being shown (otherwise you may dismiss a CEL when you should be taking note). One way is to re-program the ECU but this is expensive to do (and expensive to reverse). My work around is cheap (£52 + VAT per side plus fitting) and easily reversible.

 

[Mr_MC_SportLine]

Most sports cats are enough to pass an MOT.

Sports cats are usually fitted for more power and/or noise.

Modern ECU programming is such that the catalytic converter efficiency is monitored very tightly - any hint that it isn't functioning correctly and a CEL will be thrown. The more modern the car, the tighter the monitoring. For the F430 for example, a 2005 car will be more tolerant than a 2008.

Whilst it is useful to know if the cat is working properly, if one intentionally reduces the amount of catalyst then it is more useful to stop the monitoring alarms from being shown (otherwise you may dismiss a CEL when you should be taking note). One way is to re-program the ECU but this is expensive to do (and expensive to reverse). My work around is cheap (£52 + VAT per side plus fitting) and easily reversible.

I should have the code(s) today so will report back soon. Thanks all.

 

[Spartacus]

Why would anyone want more noise ? ;P

 

[Mr_MC_SportLine]

Most sports cats are enough to pass an MOT.

Sports cats are usually fitted for more power and/or noise.

Modern ECU programming is such that the catalytic converter efficiency is monitored very tightly - any hint that it isn't functioning correctly and a CEL will be thrown. The more modern the car, the tighter the monitoring. For the F430 for example, a 2005 car will be more tolerant than a 2008.

Whilst it is useful to know if the cat is working properly, if one intentionally reduces the amount of catalyst then it is more useful to stop the monitoring alarms from being shown (otherwise you may dismiss a CEL when you should be taking note). One way is to re-program the ECU but this is expensive to do (and expensive to reverse). My work around is cheap (£52 + VAT per side plus fitting) and easily reversible.

Barry at SB needs to check his camera/notes but he told me it wasnt Lamda related??

 

[Mr_MC_SportLine]

0492 P0492 - secondary air injection system insufficient output (max)
0491 P0491 - secondary air injection system insufficient output (min)

Under the status field, the engine management icon is present on the MAX code.

Thanks guys.

 

[CatmanV2]

0492 P0492 - secondary air injection system insufficient output (max)
0491 P0491 - secondary air injection system insufficient output (min)

Under the status field, the engine management icon is present on the MAX code.

Thanks guys.

Sounds more like your secondary air system has failed

C

 

[Mr_MC_SportLine]

Yep - definitely - I found some old links to the error codes online:

https://www.tapatalk.com/topic/79193-177666

http://www.maseratilife.com/forums/granturismo/53994-check-engine-light-please-2.html

http://www.maseratilife.com/forums/coupe-spyder-gs/16202-cel-error-code-p0492.html

http://www.ferrarilife.com/forums/modern-v8s-360-f430/21093-dtc-p0491-p0492-secondary.html

http://www.maseratilife.com/forums/granturismo/79193-08-granturismo-fault-codes.html


Anyone had this particular code before and do you recall what action was taken to resolved?

Thanks all

 

[voicey]

The secondary air system is used to inject more air into the exhaust on a cold start. The ECU enriches the mixture and the excess fuel is burnt in the exhaust with the injected air. This allows the cats to fire up more quickly.

The monitoring is performed during driving - the ECU will periodically add air and then monitor how much extra oxygen is in the exhaust using the upstream lambdas.

Your code descriptions are wrong. P0491 is insufficient air in bank 1 and P0492 is the same for bank 2. Therefore you have a problem that is common to both sides of the engine. I would start by checking the soleniod valve operation and the vacuum lines.

 

[Mr_MC_SportLine]

Thanks for the advice Voicey - is it possible something happened/changed during the installation of the CATs/Air Filter or is it likely more coincidence?