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1994 Toyota Tacoma JUST DOES NOT RUN RIGHT

Tiny
GLENN1
  • MEMBER
  • 1994 TOYOTA TACOMA
  • 6 CYL
  • 4WD
  • MANUAL
  • 144,000 MILES
I HAVE HAD TIMEING BELT, HEADS, WATER PUMP, PLUGS, WIRES, CAP, EVERY THING REPLACED. WHEN MY HG STARTED LEAKING, NOW MY TRUCK SERGES WHILE RUNNING DOWN THE ROAD AND IDLE IS UP AND DOWN. I AM ONLY GETTING ABOUT 8-10 MPH. RECHECKED THE TIMING BELT MARKS AND EVERYTHING LOOKS RIGHT. AND ENG. LIGHT COMES ON AT ABOUT 10 MPH UNDER LOAD. KNOCK SEN. CODE. CAN YOU HELP?
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Friday, February 13th, 2009 AT 10:02 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be caused by the following

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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Friday, February 13th, 2009 AT 11:47 PM

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