1993 Nissan 300ZX high erratic idle ocillating at aprox 20

1993 NISSAN 300ZX
110,000 MILES • 6 CYL • 2WD • AUTOMATIC
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BOOBOO7
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I had 2 injectors replaced by shop. They had to replace numeroud vacume tubes when the engine was only firing on 4-5b cylinders. When I pick up it
idles high and erratic - especially when warmed up. Also an RPM oscillation driving at 2000 RPM. The shop
won't admit to the problem. They tinkered with the mixture control motor, but are trying cover up the real problem - probably something to do with the vacume hoses. Totally inept - another story.
Why is it doing this. Coincidentally, the speeedometer doesnt work noe either. The car seems to have good smooth acceleration, ecept at 200 RPM The ocillation is pronounced no accelerating, but when backing off - that's when the engine ocillation occurs, and at iddle - especially when the engine is restarted when hot.
Mar 16, 2009 at 12:18 AM
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RASMATAZ
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Could be vacuum leaks, a problem with the IACV-ACC valve and throttle position sensor. Might want to check the fuel pressure.
Mar 16, 2009 at 12:31 AM