Question about 1987 Nissan Pickup

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Bogs and backfires

Starts and idles fine. Bogs badly and occaisional backfire on acceration. Runs OK at hwy speed. This actually a 1988 Urvan 2.4L.

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  • lenpaur Jun 30, 2008

    This engine has points and 4 plugs. So far I have replaced the plug and coil leads and filed the points--minor pitting. Plan to pull the plugs for a look and gapping. Might replace the points and capacitor. Looking for a strobe to set the timing. Owners manual calls for 3 degrees BTDC--how far can one go w/o causing problems? Upon depressing the gas pedal there is some acceleration before going into the bogged mode--upon relaxing the gas pedal 10-20% the engine recovers and resumes a weak acceleration. Strikes me that flooring the gas pedal results in an overly lean mixture and relaxing the pedal gets the mixture back into a useable ratio. Is there carb linkage or cams to take a look at? Other threads speak of the timing belt/chain jumping a cog--don't know which this engine has but don't like the sounds of it--seems like it idles much too well for something that drastic. Any thoughts would be most welcome. LEN

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What have you done so far? Does your van have electronic ignition or points? If the latter i'd check/replace points, capacitor & white, low tension wire inside distributor. Also check the spark plugs (all four should have the same grey/brown colour) & H.T. lead resistance, especially if the fault occurs under load/acceleration.

Posted on Jun 27, 2008

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