I've got a 1400cc Nissan Sunny (1990 model with 12v carb engine) which has been running poorly for a while.
The engine began misfiring, so I changed the distributor cap & rotor arm, and checked the leads (which are fairly new anyway). The misfiring problem seems a bit better now, but the engine still feels gutless, and has started backfiring under acceleration at low revs (1500-2000 revs). This seems worse when the engine's warmed up.
Any ideas? I'm thinking valve clearances, but does anyone else have any other suggestions?
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Sparkplugs- maybe they're quite old or incorrectly gapped? You certain the plug leads are good? Coil lead also newish?
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Replaced the plugs last November, leads have been on about 18 months. Coil lead was changed with plug leads.
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hi greg just bought a nissan suuny in france and got the same problems did you overcome your??
regards,
ian
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Never overcame the problem - I replaced everything ignition-wise, so came to the conclusion after talking to a few carburettor specialists that the carb was knackered (they're good for 80-100k, mine had done 115k). Sold the car and replaced it with an Almera. Same engine, but fuel-injected and 16v head - makes the world of difference.
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If the ignition was OK, I would check to see if the economy valve in the carburettor (if so equipped) was stuck in the economy position, thus giving a weak mixture during acceleration. Before junking the carb, it is worth stripping it down, cleaning it, and setting it up right. I've never *had* to replace a carb.
Number_Cruncher
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a compression test would have been my next port of call
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Mmm - fair point. If the misfire was regular, then I agree a compression test is a good idea. I was assuming (probably incorrectly!) that the misfire and backfiring were more sporadic.
Number_Cruncher
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hi ian
ive got same thing with a v reg seems to be missing on a pot .. but ive only just bought this one so i booked it in for test but mine seems if u put foot down to floor in second gear it takes off .. then runs fine till u stop
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