Question about 2005 Toyota Corolla
All 4 plugs dark, long term fuel trim -42%, cleaned maf-reads 4.2 g/s @ idle, tip in hesitation, fuel press. 50psi, B1S1 was black on one side and white on the other - no audible exhaust leak, O2 pretty much flat line low voltage and rises (but still flat and less low) with more rpm. MAF? Comp? Cat partially clogged? HELP PLEASE!!!!
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Posted on Jan 02, 2017
SOURCE: maf?/ missfiring
have the map sensor checked to see if it is within range you say you have codes maf make sure all clamped duct work is tight and not loose clamps .iac motor clean bore if the pintle gets stuck will cause rough idle hesitation even no start conditions scan tools only test the idle air control valve motor not the bore that extends to block varnish gets built up on the pintle and in the bore wich binds the in and out operation
Posted on Sep 12, 2008
Sounds like the fuel pressure regulator. Could also be that the timing jumped. But I'm leaning towards the pressure regulator. Hope that I could help. Best wishes.
Posted on Jan 17, 2009
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