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Rough idle

Tiny
FRED75206
  • MEMBER
  • 1998 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 169,000 MILES
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
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Thursday, August 18th, 2011 AT 11:25 PM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I assume your check engine light comes on from time to time. You should have the computer scanned for any stored trouble codes.
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Thursday, August 18th, 2011 AT 11:29 PM
Tiny
FRED75206
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  • 4 POSTS
No engine codes and no overheating
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Thursday, August 18th, 2011 AT 11:32 PM
Tiny
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  • MECHANIC
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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.
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Thursday, August 18th, 2011 AT 11:34 PM
Tiny
FRED75206
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  • 4 POSTS
I have had the engine scanned no codes were detected
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Thursday, August 18th, 2011 AT 11:57 PM
Tiny
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  • MECHANIC
  • 20,761 POSTS
There is a lot more information available besides codes. The sensor data will have to be analyzed.
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Thursday, August 18th, 2011 AT 11:59 PM
Tiny
FRED75206
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  • 4 POSTS
Do ya mean engine analysis
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Friday, August 19th, 2011 AT 12:00 AM

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