1989 Jeep Wagoneer Bogs down when starting out

1989 JEEP WAGONEER
185,000 MILES • 6 CYL • 4WD • AUTOMATIC
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POPELKA46
  • MEMBER
  • 1 POST
Help! Have all new plugs, wires, distrib cap and roter. But when starting out from stop, she bogs down or stalls. Injection problems? Once up and running, she is fine except for on & off or shaking,i.e. seems like fuel delivery is laking or intermittent. Have tried a couple of cans of Seafoam in gas tank. No improvement. SHOULD i HAVE HER CONNECTED TO COMPUTER TO DETERMINE EXACT PROBLEM? Or, can you help me with a possible simple fix? Absolutely love this old Jeep!!!!!
Dec 23, 2009 at 11:41 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Could be one of the following:

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
Dec 25, 2009 at 4:37 PM
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