Rookie Wrencher with 2008 Corolla
Join Date: Mar 2019
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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.
2008 Toyota Corolla LE
1984 R100RT BMW Boxer Twin
2003 Freightliner Sprinter travel van