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- - engine roughness (https://www.4runnerforum.com/forum/new-member-area-4/engine-roughness-2068/)

pinetree 8

02-10-2009 07:28 AM

engine roughness

I'm a new member with a 98 4 Runner SR5 w/3.4l engine which has 197k miles. Mileage has dropped to 13 mpg from 16+/- for winter ops here in Maine. Engine runs slightly rough between 40-50 mph and gets progressively worse to 70+. No difference, in or out of OD. The check engine light doesn't come on. Plugs and wires were changed about 20k ago. Thanks for any help.

pinetree 8

02-20-2009 07:48 AM

RE: engine roughness

Roughness has gone away! While enroute to the repair shop it started running OK but had it checked out anyway. Nothing showed up on the scan, no history/no codes. He thought possible EGR sticking or bad fuel. If it happens again I'll stop in and have it checked out. Mileage is back to 15+ mpg.

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