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1998 Isuzu Trooper Hesitation

Tiny
VARUUM
  • MEMBER
  • 1998 ISUZU TROOPER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 174,000 MILES
Car starts severe hesitation, spits, sputters after going @ 150-200 highway miles, almost like choking if it had a carburator. Read a little about on line and thought it may be the EGR. Cleaned the EGR and found that it was stuck but seemed to be working properly when I reinstalled but the problem remains. Car starts right back up after a brief stop but the hesitation begins again after only 70-100 miles. Never does this on around town driving, only when the engine has run for extended time. Has new spark plugs but did not replace the 6 ignition modules on top of the plugs. EGR or ignition? Could it be something else?
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Saturday, April 17th, 2010 AT 1:58 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.
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Saturday, April 17th, 2010 AT 3:18 PM

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