P1124 code 360 Modena HELP!

Here’s a start

Special OBD11 codes
https://www.ferrarichat.com/forum/index.php?posts/140272555/


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P1124 Long Term Fuel Trim Additive Air System too Lean (max)

1. Check the fuel pressure
2. Check HC CO emission with no lambda integrator
3. Check injector and wiring
4. check ignition coil and wiring
5. check exaust system leakage

Thats what the manual says.

Regards
Joerg

 

And CHECK YOUR GROUNDS

 

Hi Julius - my 360 was throwing a P1126, which I believe is the same as P1124 but for bank 2. It did it nearly every time I drove it, usually within half an hour or so of stopping and then re-starting the engine. My indy couldn't find anything wrong, and basically put it down to the non-standard (Tubi) exhaust. Once day when cleaning the engine bay, I noticed a hose that was disconnected from the vacuum accumulator on the right, rear of the engine bay. It was a hose that went to the solenoid that would have been part of the left exhaust valve, if it still had them (Tubi exhaust removes the valves). I reconnected the hose back in January this year and haven't had a CEL since. Before I found this, I did basic things like swapping O2 & MAF sensors between banks to see if the code switched banks, but nothing ever changed until I reconnected the vacuum hose. Just a thought of places to look. Good luck and let us all know what the final outcome is. Jon

 

The Error codes are all associated with Diagnosis of Fuel System Plausibility.

Left hand Bank
P1126 P1125 P1125 P1125

Right Hand Bank
P1124 P1123 P1123 P1123

The OBD II system is constantly monitoring the fuel supply system. It is designed to detect any faults in fuel supply system that could lead to incorrect or deviations in the air fuel ratio mixtures by using the primary wideband o2 sensors in a feedback loop. Mixture adaptation will try to "learn" and correct faults in order to dynamically adapt for engine operation in the best possible way.

Examples of correction are Leakage of air (or gasket leaks in general) and Pressure controller tolerance or fluctuating fuel density (Fuel Pressure faults, e.g. faulty fuel pumps or air leaks), so within certain limits (+/- 25% multiplicative and +/- 25% additive) the mixture adaptation is capable of correcting such an error with only little impact on emissions and drivability.

... However if the problem deviates too far from the above-mentioned characteristics it causes a CEL as above, in this case on your RH bank. Only part of the error can be compensated and a residual error remains which must constantly be compensated by the Lambda controller dependent on the load and engine speed point.

So check for air leaks, check air flow meters, check for good fuel pressure, check o2 sensors are good. If you have an aftermarket sports exhaust and the valves are deleted you MUST block the pipes for the valves otherwise it cannot keep vacuum and its required to do manifold switchover, etc. not just operation of the exhaust valves.

Hope this helps.

 

As a diagnostic test, would it be acceptable to plug the intake manifold where the evap hoses connect? If so, should the disconnected vacuum lines also be plugged for the test?