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post #1 of 19 (permalink) Old 03-07-2019, 02:21 PM Thread Starter
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Hi everyone

I have bought my first Mazda but some problems that i hope i can solve with you guys
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post #2 of 19 (permalink) Old 03-07-2019, 02:26 PM
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Welcome, what are your problems, and what did you get year/engine wise?


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2007 6 Hatch 3.0 V6 ATX

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post #3 of 19 (permalink) Old 03-07-2019, 02:40 PM Thread Starter
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Thanks.

I bought a 2.0 2007 manual 1 week ago, i love it

My problems are that the car runs very rich, i have one week to get it fixed
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post #4 of 19 (permalink) Old 03-07-2019, 03:06 PM
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Welcome to the forum!

Are you getting any engine codes? That would definitely help us diagnose the problem.

Unfortunately, however, they didn't sell the 2.0L Diesel in the states, so many of us won't be of much help.

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post #5 of 19 (permalink) Old 03-07-2019, 03:16 PM Thread Starter
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No it is a petrol 2.0l.

it failed the inspection 2 times in the week i owned the car because very high co, hc.

I have got p2088 and p2178 only, but they are intermittent and also they came on yesterday for first time.

I failed first inspection with only high on CO, so i did clean and also replace MAF, I cleaned the spark plugs, replaced front o2 sensor, changed oil and filter but on the second attempt i did get VERY high on CO. HC, lambda was 0.8.

Today i removed the throttle body for cleaning, and o my god how much carbon build up there was behind and inside the intake manifold, it was wet inside the intake manifold.

I have checked for vacuum leaks with spray but nothing found.
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post #6 of 19 (permalink) Old 03-08-2019, 07:16 AM Thread Starter
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Cleaned the intake manifold and thottle body, now the car runs much more stable, but still the RPM moves a little bit up and down after increase the RPM. I have to take a test drive and see.

But i dont think the problem was the cleaning, there is a problem that make all that junk in there or is it a common problem for Mazdas like the VW/Audi engines have with carbon build up?
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post #7 of 19 (permalink) Old 03-08-2019, 07:28 AM
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Iím not very familiar with the 2.0 but Iíve never seen build up that bad before, Iím not even really sure what would cause that. Have you checked the PCV valve?


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To Come lowering springs, sway bars, subframe brace, strut tower brace
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post #8 of 19 (permalink) Old 03-08-2019, 07:36 AM
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Quote:
Originally Posted by bluedevil6 View Post
Iím not very familiar with the 2.0 but Iíve never seen build up that bad before, Iím not even really sure what would cause that. Have you checked the PCV valve?


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Agreed - That's a tremendous amount of buildup. Definitely look into the PCV valve and hose - they're like $6 each and not a bad replacement (at least on the 3.0L).

p2088 is a Camshaft Position Actuator Control Circuit Low Bank 1 and is p2178 is System Too rich off idle bank 1.

How bad were the plugs when you cleaned them? It seems, with that buildup on the TB, that p2178 is your more likely culprit - you're running way too rich.

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post #9 of 19 (permalink) Old 03-08-2019, 08:10 AM Thread Starter
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Quote:
Originally Posted by bluedevil6 View Post
Iím not very familiar with the 2.0 but Iíve never seen build up that bad before, Iím not even really sure what would cause that. Have you checked the PCV valve?


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The throttle body was even worse, it was 100% closed, when filling with fluid for solving the fluid did stay in place. No not yet, i have to take of the intake manifold for that i believe? I have to do it outside and it is a bit cold here so i thought getting some advices here first
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post #10 of 19 (permalink) Old 03-08-2019, 08:24 AM Thread Starter
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Quote:
Originally Posted by Byakuya View Post
Agreed - That's a tremendous amount of buildup. Definitely look into the PCV valve and hose - they're like $6 each and not a bad replacement (at least on the 3.0L).

p2088 is a Camshaft Position Actuator Control Circuit Low Bank 1 and is p2178 is System Too rich off idle bank 1.

How bad were the plugs when you cleaned them? It seems, with that buildup on the TB, that p2178 is your more likely culprit - you're running way too rich.

I will check the PCV and hose.

The camshaft sensor was a bit dirty and the magnet was not as strong as a older sensor i have, maybe thats not important but maybe the sensor is bad. I will replace that.

The plugs where really bad, i have orderd new ones but wanted to try cleaning first with ultrasonic cleaning and sandpaper. Also i did a stupid mistake that could answer why the second inspection had way to high CO and HC, when replacing the front o2 sensor, i cut the wires because it was the easiest way to take it off under the car, and i joint the "new sensor" with old cables.

The reason i thought the o2 sensor was the problem is that when measuring the sensors i got the value on sensor 1 = 6500μA and on sensor 2 = 0.8v. And because i thought the o2 sensors only measuers in Volts i thought the o2 was bad. When replacing i got the same values so i understood that the sensor was normal, however no i can not read the sensor 1 value anymore, it say "not supported". But still i had high CO before cutting so the rich problem i somewhere else.

Could the engine temp sensor show in the middle in the car but send wrong temp to ECU?

Next step is to replace/clean the PCV and also clean the intakes, is there anything on Mazdas that i could do when i am doing all this?
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