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Question
how do i adjust carb on a 87 cutlass supreme 307,5.0,y series. it is running to rich.
There is no simple adjustment for this carburetor.It is an electronic carburetor that is controlled by the engines computer. Before attempting to adjust this carburetor you need to first make sure that the computer and its sensors are all working correctly. That means plugging a computer scanner into the diagnostic port that is located under the dash. There are a series of sensor problems like the oxygen sensor, the coolant temperature sensor, the manifold vacuum sensor that could be giving the computer false reading and causing the rich mixture. Also on these GM engines I have found that the vapor canister purge valve often leaks and causes rich mixture. The first step is to scan the computer and repair any defects picked up. Have you done these steps yet? Let me know.
Brad
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Answers by Expert:
Brad Sears
Expertise
All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.
Experience
Automotive tech instructor.
Syndicated auto columnist 1970's though the early 1990's.
Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's
TV Show "Last Chance Garage" 1980's PBS-TV syndicated.
Auto instructor for the following companies:
Fram
Autolyte
Holly
Carter
AMF
Ford Motor
University Of Conn
Blue Hills Technical School
Sugar River Technical Center
Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.
Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.
Education/Credentials
More than I care to remember.
Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.
Awards and Honors
Moto Award winner. And much more.
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