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1987 Cadillac DeVille 5.7L Poor Idle Quality
howdy. this car came in w/ rough idle. scoped and found 3 bad plugs ( platinum of course ). Replaced plugs but idle still poor. Cylinder balance test shows # 4, 5, 7 very low. I manually opened butterfly to secondaries and idle quickly improved, as did the...
FIX posted 9/19/1999
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Message Closed
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| VIN | [No VIN Available] |
| Engine | 5.7 L / 8 cyl |
| Symptoms | Poor Idle Quality |
| Occurs | Always |
Message Closed
Vehicle Data
1987 Cadillac DeVille
| VIN | [No VIN Available] |
| Engine | 5.7 L / 8 cyl |
| Symptoms | Poor Idle Quality |
| Occurs | Always |
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