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1989 Jeep Wagoneer Bogs down when starting out

Tiny
POPELKA46
  • MEMBER
  • 1989 JEEP WAGONEER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 185,000 MILES
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!
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Thursday, December 24th, 2009 AT 7:41 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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
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Saturday, December 26th, 2009 AT 12:37 AM

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