1999 Jeep Wrangler

Tiny
LISA_HILL
  • MEMBER
  • 1999 JEEP WRANGLER
  • 4 CYL
  • 4WD
  • MANUAL
  • 120,000 MILES
My jeep is lifted with 32x1250-15 When Idrive it on the highway it wont go over 40 and when I try to shift into 5th the speed declines. How do I fix this
Thursday, January 28th, 2010 AT 4:31 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect and test all the following listed below:

Oxygen sensor
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
Cap and rotor

Note:If it doesn't apply disregard.
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Friday, January 29th, 2010 AT 5:21 AM

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