2009 Mazda 6 Engine problems

Tiny
BLACKKING
  • MEMBER
  • 2009 MAZDA 6
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
I really need some help. I have a Mazda 6i Touring 2009 (2.5L, 4Cyl.) With an engine failure. I don’t have any power. When I press on the gas, the revs go up but the car is slow to accelerate, hesitates and I get a CEL. So, I connected the car to an OBDII reader and got these two codes; P0403 and P2188.

I then went to my mechanic (I live in the Dominican Republic) and had the vehicle tuned-up. I did an oil change, spark plugs change (The 2 in the middle were black, burned. The other 2 were OK) and a radiator flush. The car was still having the same problem so we decided to clean the MAF sensor, the throttle body and the EGR valve.

After putting everything back in place, he also checked for a vacuum leak but didn’t find any. We went for a ride and at first, it seemed a little bit better but after the car got warmer, same problem… I connected the car again and we got 3 more codes; P061B, P0300 and P2187.

He deleted the EGR valve and we went for a ride to see if it was the problem but it felt the same. He then decided to go for the injectors.

After listening to the injectors, he found that the two in the middle are pulsating a lot faster than the other two on each side. So, this is probably why the system is too rich. My mechanic connected a system to clean the injectors, took the rail out and tested them and said they were working fine, they are not clogged and have no leaks. He then switched the injectors to make sure. He put the 2 in the middle at the extremities and vice-versa. Same thing, the two in the middle were pulsating a lot faster than the other two even after being changed. So, this proved that the problem is not the injectors. He took the new spark plugs out to check and the two in the middle were black burned while the other two were perfect. He also switched the coils just to see and the problem remains.

He doesn’t know what else to try…

I’m lost, I really need help. I love this car and I just want it to run perfectly.

Why are only those 2 middle injectors receiving a signal to squirt more gas than the other two? What is going on?

What could be the problem?
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Monday, May 19th, 2014 AT 2:33 PM

5 Replies

Tiny
HMAC300
  • EXPERT
First check battery for condition including load test. A bad battery will give false codes. Then check fuel pressure with a gauge. Might be low. The p0300 is a misfire and 2188 and 87 may be a an a/f sensor not reading correctly causing the two codes. The other may be a bad pcm or poor connnections to egr as well as other sensors have him do a freeze frame and rund mode 6 if he can that may tell him more.
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Monday, May 19th, 2014 AT 4:41 PM
Tiny
BLACKKING
  • MEMBER
OK. Thanks!

I'll go back tomorrow and will tell him to do that.

But, why are the 2 fuel injectors in the middle shooting way faster than the other 2? Low pressure does that? Why not all 4 of them?
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Monday, May 19th, 2014 AT 4:55 PM
Tiny
HMAC300
  • EXPERT
The injector problem may be due to the code 300 you are getting or maybe an ignition problem.
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Tuesday, May 20th, 2014 AT 6:49 AM
Tiny
BLACKKING
  • MEMBER
Ok. Everybody here were saying it was a bad PCM so since I live in the Dominican Republic I had to buy another one on the Internet. It finally arrived last Thursday night so yesterday morning I went straight to my mechanic with it and after programming it, the problem remains. So they basically made me buy this PCM for nothing!

I also connected the car and here are the codes now:

Confirmed Trouble Codes
P0300: Random/Multiple Cylinder Misfire Detected (Powertrain, Generic)
P0403: Exhaust Gas Recirculation "A" Control Circuit (Powertrain, Generic)
P2188: System Too Rich at Idle (Bank 1) (Powertrain, Generic)

Pending Trouble Codes
P0300: Random/Multiple Cylinder Misfire Detected (Powertrain, Generic)
P0403: Exhaust Gas Recirculation "A" Control Circuit (Powertrain, Generic)
P2178: System Too Rich Off Idle (Bank 1) (Powertrain, Generic)
P2188: System Too Rich at Idle (Bank 1) (Powertrain, Generic)

Permanent Trouble Codes
-none

Freeze Frame
P0300: Random/Multiple Cylinder Misfire Detected (Powertrain, Generic)
Fuel system status: Fuel system 1: Open loop (2)
Fuel system status: Fuel system 2: NA
Calculated engine load: 72.9 %
Engine Coolant Temperature: 82 C
Short Term Fuel Trim - Bank 1: 0.0 %
Long Term Fuel Trim - Bank 1: 0.0 %
Intake Manifold Absolute Pressure: 79.0 kPa
Engine RPM: 3297 RPM
Vehicle Speed Sensor: 108 km/h
Ignition Timing Advance for #1 Cylinder: 28.0
Intake Air Temperature: 34 C
Air Flow Rate from Mass Flow Sensor: 51.34 g/s
Absolute Throttle Position: 30.2 %
Time Since Engine Start: 749 s
Commanded EGR: 0.0 %
Commanded Evaporative Purge: 0.0 %
Fuel Level Input: 40.0 %
Number of warm-ups since DTCs cleared: 0
Distance traveled since DTCs cleared: 15 km
Evap System Vapor Pressure: 7.3 Pa
Barometric Pressure: 101 kPa
Catalyst Temperature Bank 1, Sensor 1: 858 C
Control module voltage: 13.45 V
Absolute Load Value: 65.1 %
Fuel/Air Commanded Equivalence Ratio: 1.000
Relative Throttle Position: 20.8 %
Ambient Air Temperature: 33 C
Absolute Throttle Position B: 30.2 %
Accelerator Pedal Position D: 33.7 %
Accelerator Pedal Position E: 16.9 %
Commanded Throttle Actuator Control: 25.1 %
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Saturday, May 31st, 2014 AT 7:15 AM
Tiny
HMAC300
  • EXPERT
What is fuel pressure? I said to check that in first reply should be 54-65 psi after 5 minutes should hold 29 psi or more. I can't really make anything out of the freeze frame data is the a/f sensors getting any voltage?Are there any vacuum leaks? Like soft hoses/cracked as well as grommets on valve cover and air leaking prior to the throttle body between maf and throttle body. Other than that I have no idea what to tell you if this was a dontation question let me know and i'll either have your refund and or another tech will answer this.
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Saturday, May 31st, 2014 AT 8:48 AM

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