My 89 Trooper 2.6L 4 cyl has 159,000 miles on it. It runs great but after it warms up and I stop at intersections, the engine idles up and down between 1500 and 2000 rpms. Any ideas?

Asked by rayo140 Feb 16, 2013 at 04:22 PM about the 1989 Isuzu Trooper

Question type: Maintenance & Repair

When warm the engine idles up and down, 1500 to 2000 rpms.

DavidH25 answered 11 years ago

Several things can cause loping like that. egr valve stuck, timing, vacuum leak

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My 89 Trooper 2.6L 4 cyl has 159,000 miles on it. It runs great but after it warms up and I stop at intersections, the engine idles up and down between 1500 and 2000 rpms. Any ideas?

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My 89 Trooper 2.6L 4 cyl has 159,000 miles on it. It runs great but after it warms up and I stop at intersections, the engine idles up and down between 1500 and 2000 rpms. Any ideas?

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