Replace ECM? Can you confirm or help rethink? - Toyota Nation Forum : Toyota Car and Truck Forums
Corolla 9th Gen/1st Gen Matrix (2003-2008) 9th generation Corolla and 1st generation Matrix discussion.

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post #1 of 65 Old 04-13-2019, 01:03 PM Thread Starter
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Replace ECM? Can you confirm or help rethink?

Great forum! Lots of good info! Thanks to hardtopte72 and others for the great write-ups!

My 2008 Corolla (80,000 miles) started blowing blue smoke with gas smell when cold starting. The engine would surge at idle and would die. Once warmed up it would drive OK with hesitation at low RPM. Lots of misfire codes, P300, 301, 302, 303, 304. After OBD reset, not always the same cylinders. Also P2195 and P0420 codes, not at first but after some diagnostics, resets and test drives.

Work to date:
Replaced intake manifold gasket, new spark plugs with .043 gap, cleaned throttle, new PCV, cleaned MAF and replaced #4 injector. Checked spark and compression, all cylinders good.

I checked the front O2 sensor, 3.2 OHMS across the heater (2 black wires). I also checked voltage to the heater on the engine harness. I do not get 12 volts with key on engine off. The top wires on the harness are black and pink, the pink is open. Bad ECM?

The smoke and start problem has gotten worse. Cant run it long enough to warm up the engine and the check engine light comes on and is flashing. Only code is P0303.

Iím new to computer cars but I am thinking the ECM has gone bad and needs replacing. It was replaced in 2012 under a factory recall. Can anyone confirm or help rethink this diagnosis?

Side note: checked oil level, it was 1-1/2 quarts over! 2000 mile driven since quick lube service, guess I need to do my own oil now! Also noticed a couple of teaspoons of oily residue in my air intake manifold when replacing the gasket.

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post #2 of 65 Old 04-13-2019, 10:15 PM
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Check timing. Sounds like you skipped a tooth or two. You could also have damaged valves. Have you done a compression test?
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post #3 of 65 Old 04-13-2019, 10:30 PM
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First step is compression test.

Iím not sure ECM turns on O2-sensor heater until engine is running. And itís not a straight 12v DC signal. Itís PWM to fine-tune actual amount of heating based on exhaust temperature.
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post #4 of 65 Old 04-13-2019, 10:40 PM Thread Starter
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Did a compression test, all cylinders around 170 PSI. What would cause the timing to be out?

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post #5 of 65 Old 04-14-2019, 12:19 AM
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Just an FYI you own a 9th gen Corolla. Moved your thread here where it belongs. Welcome to toyotanation I see @DannoXYZ has started helping you fix the issue at hand so your in much better hands than if I tried. Enjoy toyotanation.

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post #6 of 65 Old 04-14-2019, 09:49 AM Thread Starter
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Thanks G_gazoo, not sure how I posted to wrong forum

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post #7 of 65 Old 04-14-2019, 10:54 AM
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Not sure why. Bad tensioner?
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post #8 of 65 Old 04-14-2019, 12:16 PM Thread Starter
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Quote:
Originally Posted by DannoXYZ View Post
Iím not sure ECM turns on O2-sensor heater until engine is running. And itís not a straight 12v DC signal. Itís PWM to fine-tune actual amount of heating based on exhaust temperature.
Is there another test I can do to confirm O2-sensor is good or bad? Is the pink wire on the harness the ground and do you know if it is switched or not? Any test for the ECM?

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post #9 of 65 Old 04-14-2019, 03:52 PM
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If p0303 is the only code left then swap the #3 injector and COP to another cylinder. See of the misfire moves to that cylinder.

It sounds like you had severely restricted injectors that have been partially fixed since you only replaced 1 injector. Did it happen after filling up somewhere sketchy?

Last edited by doctorbee; 04-14-2019 at 03:55 PM.
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post #10 of 65 Old 04-14-2019, 05:22 PM Thread Starter
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Quote:
Originally Posted by doctorbee View Post
If p0303 is the only code left then swap the #3 injector and COP to another cylinder. See of the misfire moves to that cylinder.

It sounds like you had severely restricted injectors that have been partially fixed since you only replaced 1 injector. Did it happen after filling up somewhere sketchy?
The thing is, I started her up on Friday after clearing codes. Got flashing engine light and P0304. Tried again Saturday morning, cleared the codes and got P0303. The injectors looked pretty clean and after energizing them I was able to blow out the fuel in them with my mouth, all but #4.

When this started a month ago, it only smoked, missed and died until I warmed her up for 8 to 10 minutes. Then she ran good with no smoke except when RPM got below 2000 I could feel her miss and hesitate from a stop. Got codes P0300, P0301, P0304. During diagnosis I would reset codes and the missing cylinder codes were not consistent, they would jump to different cylinders and once got all 4 cylinders and P0420. Shortly after this is when I did all the work listed above. It has gotten progressively worse. Now I can't run her for more than about a minute, lots of smoke and check engine flashing. I checked that I got all the vac hoses hooked up and correct. I have double checked all my work.

Don't think I got bad gas but I guess that is possible. Beating my head against the wall!

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post #11 of 65 Old 04-14-2019, 05:39 PM
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Flashing engine means severe misfire. Major vacuum leak or major fuel delivery issues come to mind.

Also, if one injector was restricted chances are that all are restricted and need to be replaced.

What are your MAF values at idle and 2500 RPM?

What are your fuel trim readings at idle and 2500 RPM?
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post #12 of 65 Old 04-14-2019, 08:01 PM
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You can also check the upstream vs downstream o2 sensors. If both are reading lean then you are likely truly running lean.
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post #13 of 65 Old 04-15-2019, 10:33 AM Thread Starter
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Quote:
Originally Posted by doctorbee View Post
What are your MAF values at idle and 2500 RPM?

What are your fuel trim readings at idle and 2500 RPM?
Quote:
Originally Posted by doctorbee View Post
You can also check the upstream vs downstream o2 sensors. If both are reading lean then you are likely truly running lean.
Thanks Doctorbee, not familiar with these test. I'll need to check out my scan meter and see if I can figure out haw to run them.

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post #14 of 65 Old 04-15-2019, 10:40 AM
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Another user in the 8th gen forums had similar symptoms and fixed it by replacing with refurbished DENSO injectors

https://www.toyotanation.com/forum/s...6&goto=newpost
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post #15 of 65 Old 04-17-2019, 12:01 PM Thread Starter
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Quote:
Originally Posted by doctorbee View Post
What are your MAF values at idle and 2500 RPM?

What are your fuel trim readings at idle and 2500 RPM?

You can also check the upstream vs downstream o2 sensors. If both are reading lean then you are likely truly running lean.
Can't get enough run time to check live data. Missing bad and belching smoke that smells of fuel. Runs less than 30 seconds and check engine light starts flashing.

Quote:
Originally Posted by doctorbee View Post
Another user in the 8th gen forums had similar symptoms and fixed it by replacing with refurbished DENSO injectors

https://www.toyotanation.com/forum/s...6&goto=newpost
After last startup it ran about 30 seconds, smoke and missing, CEL flashing and started belching smoke from the AIR FILTER and MAF area! Smelled of fuel! Whats that about? Checked codes, P0300, P0303 and P0304. Pulled the plugs which are new, Plugs 1 & 2 have carbon build up and plugs 3 & 4 are wet with fuel. Ran another compression test and all cylinders within 2 pounds of 175 PSI. It looks rich rather than lean and don't know what would cause smoke to come out of the air filter

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