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1997 Lexus ES 300 Missing

Tiny
RILEY999
  • MEMBER
  • 1997 LEXUS ES 300
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 126,000 MILES
My ES300 has a fairly assertive miss when operating at 1750 RPM at constant speed with no acceleration. The problem only occurs after the vehicle has been driven for an extended period at highway speeds. I had it serviced for this problem and they replaced the plugs and plug wires. The miss is still present. Any ideas as to where to look next?
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Thursday, November 12th, 2009 AT 2:16 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Thursday, November 12th, 2009 AT 3:20 PM

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