Spart plug recommendations-Car backfires on deacceleration
Folks,Car is backfiring on deceleration.1972 L-Demon Carb, Eldebrock intake manifold. Stock engine. --No exhaust leak. Removed a few spark plugs, they are dry and tan (ish) brown in color.Plugs are Motorcraft ASF 42c gapped at 40 Rather than remove, regap and clean plugs, can you please recommend what would be a "better" plug and Gap by todays standard? (Car has only about 20k miles on these plugs). What next to troubleshoot backfiring if its not the plugs? Carb cleaner? (although carb look immaculate) Thank you in advance! Cliff-NY Folks, Car is backfiring on deceleration. 1972 L- Demon Carb, Eldebrock intake manifold. Stock engine. --No exhaust leak. Removed a few spark plugs, they are dry and tan (ish) brown in color. Plugs are Motorcraft ASF 42c gapped at 40 Rather than remove, regap and clean plugs, can you please recommend what would be a "better" plug and Gap by todays standard? (Car has only about 20k miles on these plugs). What next to troubleshoot backfiring if its not the plugs? Carb cleaner? (although carb look immaculate) Thank you in advance! Cliff-NY
Backfiring on decel makes you think of a lean mixture. Either a vacuum leak in the intake system or the carbs have leaned our. Sent from AOL Mobile Mail On Sunday, March 16, 2025, 10:34 AM, Panteratime via DeTomaso <detomaso@server.detomasolist.com> wrote: Folks, Car is backfiring on deceleration. 1972 L- Demon Carb, Eldebrock intake manifold. Stock engine. --No exhaust leak. Removed a few spark plugs, they are dry and tan (ish) brown in color. Plugs are Motorcraft ASF 42c gapped at 40 Rather than remove, regap and clean plugs, can you please recommend what would be a "better" plug and Gap by todays standard? (Car has only about 20k miles on these plugs). What next to troubleshoot backfiring if its not the plugs? Carb cleaner? (although carb look immaculate) Thank you in advance! Cliff-NY _______________________________________________ Detomaso Email List is not managed by POCA Posted emails must not exceed 1.5 Megabytes DeTomaso mailing list -- detomaso@server.detomasolist.com To unsubscribe send an email to detomaso-leave@server.detomasolist.com To manage your subscription (change email address, unsubscribe, etc.) use the links above. Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages. Backfiring on decel makes you think of a lean mixture. Either a vacuum leak in the intake system or the carbs have leaned our. Sent from AOL Mobile Mail On Sunday, March 16, 2025, 10:34 AM, Panteratime via DeTomaso <detomaso@server.detomasolist.com> wrote: Folks, Car is backfiring on deceleration. 1972 L- Demon Carb, Eldebrock intake manifold. Stock engine. --No exhaust leak. Removed a few spark plugs, they are dry and tan (ish) brown in color. Plugs are Motorcraft ASF 42c gapped at 40 Rather than remove, regap and clean plugs, can you please recommend what would be a "better" plug and Gap by todays standard? (Car has only about 20k miles on these plugs). What next to troubleshoot backfiring if its not the plugs? Carb cleaner? (although carb look immaculate) Thank you in advance! Cliff-NY _______________________________________________ Detomaso Email List is not managed by POCA Posted emails must not exceed 1.5 Megabytes DeTomaso mailing list -- [1]detomaso@server.detomasolist.com To unsubscribe send an email to [2]detomaso-leave@server.detomasolist.com To manage your subscription (change email address, unsubscribe, etc.) use the links above. Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages. References 1. mailto:detomaso@server.detomasolist.com 2. mailto:detomaso-leave@server.detomasolist.com
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