1989 Jeep Cherokee

HGWOOMER3

MEMBER
1989 JEEP CHEROKEE
6 CYL
4WD
AUTOMATIC
262,000 MILES

When I reach 55 mph I can not get any RPMs. To get the car running well again I have to turn off the car for 2 min. Or so to get it going. All of the emisions have been changed out. It has a new catalitc converter. There is a new EGR. What could be the problem?

Thursday, January 7th, 2010 AT 11:00 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Could be one of the following-check and test as suggested

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

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Thursday, January 7th, 2010 AT 11:12 PM