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Why does your 1979 620 Datsun backfire pass 4000rpm or sometimes when you dont run it enough?
Wiki User
∙ 14y ago
The possible reasons why your 1979 620 Datsun may backfire pass 4000 RPM's may be because because either, you need to replace the fuel filter, clean the fuel injectors, run supreme gas( due to age of the car), replace spark plugs, ignition coil may be disconnected, ignition rotor may be scarred (about a $5.00 part)and need to be replaced, replace pcv valve ,replace air filter or timing may be off. See available supplemental information regarding engine diagnosis at related link.
Wiki User
∙ 14y ago
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