Wondering if anyone had any ideas about what could possibly be causing my manifold to quite literally glow bright red on tick over and for it to be running rough, I’ve had a look at the purge valve and it seems all good and I’m unsure of where to look next.

I’ve attached a picture below of the codes it’s showing.

Thank you! 

 

2 hours ago, jack8374 said:

Wondering if anyone had any ideas about what could possibly be causing my manifold to quite literally glow bright red on tick over and for it to be running rough, I’ve had a look at the purge valve and it seems all good and I’m unsure of where to look next.

I’ve attached a picture below of the codes it’s showing.

Thank you! 

 

Hi nice scanner, I think the nox sensor could well be the trouble as when these sensors go the ECU can't get the information it requires to meter the fuelling and temperature from the gas stream i.e. when the sensor detects a rise in nox the ECU adjusts the fuel/air mix to cool the engine so the nox comes down, the hotter the engine the more nox produced, now we have a sensor where the heater core is failed this heats and then its calculations are made by a sample chamber which makes the calculations based on how long the core takes to cool, therefore when the sensor is no longer able to give plausible information the ECU will go to a default setting which normally makes the fuel ratio higher to prevent piston/valve damage from heat caused by it running lean.

Steve.

5 hours ago, Stevey Y said:

Hi nice scanner, I think the nox sensor could well be the trouble as when these sensors go the ECU can't get the information it requires to meter the fuelling and temperature from the gas stream i.e. when the sensor detects a rise in nox the ECU adjusts the fuel/air mix to cool the engine so the nox comes down, the hotter the engine the more nox produced, now we have a sensor where the heater core is failed this heats and then its calculations are made by a sample chamber which makes the calculations based on how long the core takes to cool, therefore when the sensor is no longer able to give plausible information the ECU will go to a default setting which normally makes the fuel ratio higher to prevent piston/valve damage from heat caused by it running lean.

Steve.

Hi Steve, thanks for the reply. I follow your logic and that’s definitely something I’ll be having a look at, but it’s the degree of overfuelling that’s throwing me off, as my manifold was quite literally glowing molten red while just sat idling, which tells me that something else might be at play. Any ideas? 
 

thanks 

19 hours ago, jack8374 said:

Hi Steve, thanks for the reply. I follow your logic and that’s definitely something I’ll be having a look at, but it’s the degree of overfuelling that’s throwing me off, as my manifold was quite literally glowing molten red while just sat idling, which tells me that something else might be at play. Any ideas? 
 

thanks 

Hi the default strategy for failed sensors would dictate that the fuelling will be higher than normal, but in saying that the only other thing to present such symptoms would be a collapsed CAT, try the sensor first its the cheapest part.

Steve.