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Spark Plug Read, please.... |
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sed0007
AMC Apprentice Joined: May/14/2013 Location: Cleveland Ohio Status: Offline Points: 122 |
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Posted: Jun/08/2023 at 2:01pm |
Have had this 69 Rambler for three years, now. Bought it w/ 26,000 miles, now have , 33,000 miles. Other than a water pump, I've done nothing to this car but change the oil once. It always starts, and while my daily driver was down for a few weeks waiting for brake parts with the dealer, I drove the Rambler to work every day for two weeks, round trip 32 miles, half highway and half surface streets. Always gets 22 mpg. It's the 199 straight six with 3 on the tree.
Previous owner has an old Cherry Bomb muffler, an the car is starting to backfire when off throttle. My daily driver is back, so I decided to pull the plugs. I don't think they look too bad, and are all gapped at .033. Tell me what you think. Next step is to check timing and play with the carburetor. one of the pics is a 2nd image of the 2nd or 3rd plug, as it was a lot different on each side. Edited by sed0007 - Jun/08/2023 at 2:18pm |
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'64 550;'63 660;'62 Classic Custom; '69 Rambler 440
http://walkingwithstefan.wordpress.com/ |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3553 |
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Backfiring when letting off the throttle is more likely a leak somewhere in the pipe. It'll draw in air and light off the richer mix from deceleration . Plugs look fine
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16611 |
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What 488 said. Maybe exhaust donut on manifold is starting to leak?
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sed0007
AMC Apprentice Joined: May/14/2013 Location: Cleveland Ohio Status: Offline Points: 122 |
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Thanks!! I'll get under it and see. I was worried about being too lean.
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'64 550;'63 660;'62 Classic Custom; '69 Rambler 440
http://walkingwithstefan.wordpress.com/ |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
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If it has good power and doesn't bog or hesitate at light to mid throttle when the engine is halfway warmed-up, then it is perfect.
They are always darker on one side. Very good oil control. |
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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sed0007
AMC Apprentice Joined: May/14/2013 Location: Cleveland Ohio Status: Offline Points: 122 |
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Thanks!! It bogs sometimes, that's why my nest step is to look at the points and then adjust the carb. I have a big vacuum gauge, just wondering where to access the vacuum so I can look at timing and idle/mixture.
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'64 550;'63 660;'62 Classic Custom; '69 Rambler 440
http://walkingwithstefan.wordpress.com/ |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3553 |
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Can't speak for all systems, but several OE injection systems cut fuel completely on hard deceleration until a set rpm ( in the neighbood of 1,500; rpm )Good factory manuals state this and I've watched it on my widebands.
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