Rough idle

1998 CHEVROLET BLAZER
169,000 MILES • 6 CYL • 2WD • AUTOMATIC
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FRED75206
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I have a 1998 Chevy Blazer 2wd 4dr with approx. 169 k. The problem I am having is rough idling, i believe the engine runs smooth during normal driving. The vehicle has no lack of power but is getting poor fuel mileage. I have replaced general tuneup items such as spark plugs, fuel filter, cap and rotor, egr, possibly everything externally. I noticed today there was oil in water but not on dipstick. Please help with any suggestions you might have I am running out of ideas.
sincerely Richard P
Aug 18, 2011 at 4:25 PM
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WRENCHTECH
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I assume your check engine light comes on from time to time. You should have the computer scanned for any stored trouble codes.
Aug 18, 2011 at 4:29 PM
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FRED75206
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no engine codes and no overheating
Aug 18, 2011 at 4:32 PM
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WRENCHTECH
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The computer should be picking up on those issues. You will need a scan tool to observe the data and get a picture of what is going on with the system.
Aug 18, 2011 at 4:34 PM
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FRED75206
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I have had the engine scanned no codes were detected
Aug 18, 2011 at 4:57 PM
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WRENCHTECH
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There is a lot more information available besides codes. The sensor data will have to be analyzed.
Aug 18, 2011 at 4:59 PM
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FRED75206
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do ya mean engine analysis
Aug 18, 2011 at 5:00 PM
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