Another P2187 and P2177 thread - Mazda3 Forums : The #1 Mazda 3 Forum
 
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post #1 of 3 (permalink) Old 04-12-2020, 11:42 PM Thread Starter
Moped Rider
 
Join Date: Jan 2020
Posts: 46
Garage
Another P2187 and P2177 thread

Yeah.... this again.

The car is rather new to me, and Im determined to get this friggin thing running without issues.

So my car runs great....... cold start it idles really rough though, once it warms up it is fine but of course with these awesome errors.

This is what I have done so far
-replace plugs,
-replace valve cover gasket
-Purge solenoid replaced - although mine is a squared one compared to what one company sent me and everyone seems to have.
-MAF cleaned
-Throttle body cleaned
-replacement fuel cap is on the way the one on the car doesnt seem to really tighten


Not sure hot to check for leaks at home... the hoses look to be ok and nothing sticks out. I have that EONON radio with the OBD scanner piece but I dont know if it's giving me realtime fuel data to do an analysis.



This is what I have been able to piece together by doing countless searches. Does the rough idle at cold start point to anything in particular from this list?


These codes will come on if the same condition is seen for two consecutive starting cycles.

P2177 = Fuel system too lean at off idle

P2187 = Fuel system too lean at idle

List of possible causes for both codes:
Misfire
Front HO2s deterioration
Front HO2s 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
PCM malfunction

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post #2 of 3 (permalink) Old 04-16-2020, 08:35 AM Thread Starter
Moped Rider
 
Join Date: Jan 2020
Posts: 46
Garage

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post #3 of 3 (permalink) Old 04-16-2020, 11:00 AM
Short Track Racer
 
Join Date: Jun 2015
Posts: 240
You can use carb cleaner or propane to check for vacuum leaks, and there are lots of videos available online showing how to do that. Also, a vacuum gauge can often provide very good diagnostic information for a variety of engine-related problems. It might also be helpful to get a look at the OBD realtime data, particularly the fuel trim values.

2011 3i 2.0 A/T 145K miles
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