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Car Forum / GMC Cars / November 2005fouled plugs
My son's 90 Lumina with a 3.1 engine has developed a miss. We pulled all the plugs and found #3 and #5 plugs were carboned up. Replaced the plugs along with sparkplug wires and it still has the miss. Normally I would do a compression check next, however my compression tester is unavailable for a few days. Is there anything else I can check while I wait for my tester? Thanks for your help Dale > My son's 90 Lumina with a 3.1 engine has developed a miss. We pulled > all the plugs and found #3 and #5 plugs were carboned up. Replaced the > plugs along with sparkplug wires and it still has the miss. Normally I > would do a compression check next, however my compression tester is > unavailable for a few days. Is there anything else I can check while I > wait for my tester? 1. Is only one cylinder missing? 2. Are multiple cylinders missing? 3. Are random cylinders missing? Steve > > My son's 90 Lumina with a 3.1 engine has developed a miss. We pulled > > all the plugs and found #3 and #5 plugs were carboned up. Replaced the [quoted text clipped - 8 lines] > > Steve 1. NO 2. YES 3. NO > > 1. Is only one cylinder missing? > > 2. Are multiple cylinders missing? [quoted text clipped - 3 lines] > 2. YES > 3. NO Excellent, which cylinders are missing? > My son's 90 Lumina with a 3.1 engine has developed a miss. We pulled > all the plugs and found #3 and #5 plugs were carboned up. Replaced the [quoted text clipped - 4 lines] > Thanks for your help > Dale Have you checked for spark? > My son's 90 Lumina with a 3.1 engine has developed a miss. We pulled > all the plugs and found #3 and #5 plugs were carboned up. Replaced the [quoted text clipped - 4 lines] > Thanks for your help > Dale A cheap spark plug tester can be very helpful in wringing out problems like this. If you dont have equivalent spark on the fouling plugs, then clearly you have to back up into the ignition system #3 and #5 are next to each other, arent they? |
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