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Showing results for tags 'engine run problem'.
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Problem started last September on normally aspirated 2.5 motor, when all of a sudden car idled and ran poorly. CEL came on along with blinking cruise control light, and brake antilock dash light indicator. I thought it may be bad gas, so added 8 gallons of E-85. This fixed the problem entirely within about 50 miles, so thought all is well. The same problem came back just before Christmas. I pulled codes, but only said spark plug miss-fire. I cleared codes, and no codes appeared. So, replaced the knock sensor, and fuel pump and fuel filter unit. Upon start up ran fine for a few seconds, then miss fires started again. Expected a new fuel pump to fix the problem, but not so; but it seems to be a fuel problem, as sometimes it takes additional throttle to start engine. It won't necessarily start by just turning the key with no extra accelerator assistance. Got me stumped on how to fix with no CEL to give direction. Doesn't seem like spark plug trouble, as motor can run so well, then instantaneously run so poorly. Maybe a bad computer?? Any advise really appreciated.