Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK1985CENTURY V6-231 3.8LREPAIR AND DIAGNOSISCRUISE CONTROLTECHNICAL SERVICE BULLETINSTOOLS - MODIFIED DIAGNOSTIC ROUTINE WITH QUICK CHECKERS
1985 Buick Century V6-231 3.8L
Tools - Modified Diagnostic Routine With Quick Checkers
1985 Buick Century V6-231 3.8LSECTION Tools - Modified Diagnostic Routine With Quick Checkers
85buick4
Bulletin 86-9-4
Date Nov., '85
Ref. No. 86-039-9
SUBJECT: MODIFICATION OF DIAGNOSTIC ROUTINE ON THE CLARK BROS., KENT-MOORE AND SPECMO CRUISE CONTROL "QUICK CHECKERS"
MODELS AFFECTED: 1984, 1985, 1986
Following is an explanation of both the present and revised diagnostic sequences.
PRESENT DIAGNOSTIC SEQUENCE:
The existing diagnostic test procedure (see figure 1) listed on the reverse side of these "Quick Checkers" includes five troubleshooting steps.. Each step provides a reliable indication--by the illumination of a light--of the electrical continuity of specific components in the cruise control system. A large number of GM Dealership service personnel are under the misunderstanding that these same five steps, also, verify the condition of the cruise vacuum system. This is not the case. To clear up this mistaken assumption, an essential addition has been incorporated in the existing test procedure:
REVISED DIAGNOSTIC SEQUENCE:
Besides the listed 5 steps, a sixth one (see figure 2) has been added. This step allows the technician to check the cruise system vacuum integrity from the accumulator tank through the vacuum servo.
To obtain the new diagnostic stickers, contact your Zone office or District Service Manager. Place the sticker over the one presently on the "Quick Checker." If additional stickers are needed in the future, contact:
SPECMO Enterprises 2344 N. Woodward Ave. Royal Oak, MI 48073 (313) 399-5645
Bulletin 86-9-4
Date Nov., '85
Ref. No. 86-039-9
SUBJECT: MODIFICATION OF DIAGNOSTIC ROUTINE ON THE CLARK BROS., KENT-MOORE AND SPECMO CRUISE CONTROL "QUICK CHECKERS"
MODELS AFFECTED: 1984, 1985, 1986
Following is an explanation of both the present and revised diagnostic sequences.
PRESENT DIAGNOSTIC SEQUENCE:
The existing diagnostic test procedure (see figure 1) listed on the reverse side of these "Quick Checkers" includes five troubleshooting steps.. Each step provides a reliable indication--by the illumination of a light--of the electrical continuity of specific components in the cruise control system. A large number of GM Dealership service personnel are under the misunderstanding that these same five steps, also, verify the condition of the cruise vacuum system. This is not the case. To clear up this mistaken assumption, an essential addition has been incorporated in the existing test procedure:
REVISED DIAGNOSTIC SEQUENCE:
Besides the listed 5 steps, a sixth one (see figure 2) has been added. This step allows the technician to check the cruise system vacuum integrity from the accumulator tank through the vacuum servo.
To obtain the new diagnostic stickers, contact your Zone office or District Service Manager. Place the sticker over the one presently on the "Quick Checker." If additional stickers are needed in the future, contact:
SPECMO Enterprises 2344 N. Woodward Ave. Royal Oak, MI 48073 (313) 399-5645
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.