Re: Wont start
Battery is how old?
If you turn on headlights, then crank the engine, the lights dim or go out?
If you place a voltmeter across battery posts, no lights on, crank the engine, does voltage go below 9.5 volts? - if it does, weak battery or not enough charge, corroded connections either from alt to battery, or too small battery cables.
Once engine starts, battery post voltage is ? Fourteen volts and higher is good. If reading is lower and the voltage recovers after a minute, good system.
The reason I suggest the above is to eliminate the cranking circuit and the effect of low current available for other circuits at the same time. If a starter is drawing more current than usual due to supply being low, weak battery can't produce enough current, then other circuits are going to feel the same potential and not function as designed, hence, if starter is taking most of the energy due to low cranking voltage, ignition system isn't going to have enough current to make a decent spark.
Another trick, ambient temp above 80°, no engine start attempt for the day, remove the MAF sensor and place it in the freezer for about 20-30 minutes. Then reinstall MAF sensor. Does it start?
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