1989 Isuzu Trooper Poor Mileage

1989 ISUZU TROOPER
220,000 MILES • 4 CYL • 4WD • MANUAL
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BARUSU
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Bought this SUV two years ago, and have never been able to get over 17mpg city/hwy combined.

Engine starts easily under all conditions, idles smoothly, has the usual Isuzu lifter 'tick' and stumbles a little when cold, but no other driveability issues.

I added a clean, used K&N air filter, plus new plugs, points, rotor, cap; checked timing. Also, two tank treatements of Barrysman injector cleaner.

Only things left, I think, are the Oxy Sensor, and the Injectors. Any other thoughts?
Oct 19, 2009 at 7:16 PM
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SERVICE WRITER
  • ✓ASE Certified Mechanic
  • 9,123 POSTS
  • ASE Certified Mechanic
We did address this here:
http://www.2carpros.com/forum/gas-mileage-tips-vt135422.html

Feel free to continue thread.
Oct 20, 2009 at 7:55 AM
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