Hello everyone. I am the proud owner of an 04 Mazda 6. I am getting an engine code 2187 intake manifold runner lean@idle bank 1 circuit I low voltage Replaced gaskets which I was told could be the issue and not the sensor?? Or is it a solenoid?? Engine is 2.3 186000 kms. Any help or knowledge is appreciated. Just want to get back to driving my car

 

Could be a vaccuum leak originating from: throttle body seal (gasket between throttle body and intake plenum, clean your throttle body as well), intake plenum seals, accordian intake hose (most likely as these crack with age) which is from air box to throttle body, MAF sensor (clean it), Purge Valve Solenoid located on firewall passenger side.

Potential Causes of P2187 DTC:
Faulty O2 sensor (front)
Faulty gas cap seal Leaky or loose oil filler cap
Air leaking into the intake manifold downstream from the Mass Airflow sensor due to the manifold itself, vacuum hoses off or cracked, leak MAP sensor, Leak at turbo bypass or it's stuck open, power brake booster hose, or a leak in the EVAP system hoses.
Faulty MAP sensor EVAP canister purge valve
Fuel injector leak
Fuel pressure regulator faulty
Leaks in the exhaust system
Faulty variable camshaft timing Faulty ECM (engine management computer)
Faulty O2 preheater (front)
Clogged fuel filter Fuel pump wearing out and producing low pressure.
Faulty mass air flow sensor

 

DTC P2187 Fuel system too lean at idle

DETECTION CONDITION

• The PCM monitors short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) during closed loop fuel control at idle. If the LONGFT and the sum total of these fuel trims exceed the preprogrammed criteria, the PCM determines that fuel system is too lean at idle.
Diagnostic support note
• This is a continuous monitor. (Fuel system)
• MIL illuminates if PCM detects the above malfunctioning condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if PCM detects the above malfunction conditions during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Misfire
• A/F sensor deterioration
• A/F sensor heater malfunction
• MAF sensor malfunction
• Pressure regulator (built-in fuel injection pump) malfunction
• Fuel pump malfunction
• Fuel filter clogged or restricted
• Fuel leakage on fuel line from fuel delivery pipe and fuel pump
• Leakage exhaust system
• Purge solenoid valve malfunction
• Purge solenoid hoses improper connection
• Air suction in intake-air system
• Insufficient engine compression
• Variable valve timing control system improper operation (LF, L3)
• PCM malfunction

 

Have you ever replaced the fuel filter?
Test the fuel pressure at the fuel rail.
How old are the spark plugs?
Hows the air filter?
Get the ignition/valve timing checked.

 

No the fuel filter has never been changed on the car now come to think of it. As for plugs the car is due to have them changed. I will due that soon as I am not driving the car full time yet but within the next month I will be. I really don't believe it to be a sensor. Map sensor was cleaned. Possibly a vacuum leak but cant hear it. Car still has lots of power when driving. I'm thinking of changing the vacuum lines on the vehicle.
Thank you for you input I really appreciate it. I will update when I try some of these ideas you have given me.

 

So after some time I brought my 04 Mazda 6 to the dealer. I'm told that the sensors are possibly the issue which is what I thought all along. So my question is can anyone give me a good Canadian site to get these parts. I need a
Variable intake-air control solenoid valve
Variable tumbler control solenoid valve


Both of these are located in the runners of the intake manifold.


Any help is appricated

 

Think those may be dealer items.
You can try: Auto Parts in Canada! - Canada Auto Parts Online

 

really??? Dealer only gross!!! I will check out that website again thanks

 

Try some Mazda wreckers for a complete 2nd hand manifold.

 

It would have to be a huge vacuum leak to hear it. A cracked vacuum line can cause all sorts of problems and this is common in older cars due to heat and age. It's good -- and cheap -- preventative maintenance to just replace them.

The good news is it's easy and quick to check for vacuum leaks with a can of spray carb cleaner. With the engine running, spray around the intake manifold and any vacuum lines. If the engine speed changes you just found one. Even if replacing sensors this is a good idea.