Question about 1983 Mazda RX-7

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1983 Mazda RX7 lacks power rough or no idle

Rebuilt carb, tried adjusting air/fuel/idle bolts, replaced plugs, fuel filter, tested fuel pump. Seems to run rich(draining carb of fuel, strong smell) despite the adjustments to the air/mixture bolt. Can get it to idle at 1500rpm but if revved will drop to 500 and die(usually does this immediately). Will idle with choke. Lacks power, 10 seconds to redline in neutral and dies around 20 mph and bucks in 2nd gear, again, assuming it is running dry. It has good fuel flow, but seems to eat more fuel than being given. Also, adjusted floats, they are not exact, but we are sure they are close enough for the purpose of getting it running.

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  • jhn_conger May 18, 2009

    fuel pressure is weak. cleaned the carb and changed the fuel lines as well as the fuel pump. help please

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I have the same prob but when i do get it running at bout 70 miles per hour i boggs and wants ta die at idle when i get to a lower speed after i restart it. ive changed the fuel filter and pump n cleened the tank. when i first got the car it had no probblems. no the car will barley start n if it dose it runs fine for a minute then i loose most of the power n it wants to die when i go ta idle. HELP!!!

Posted on Jan 25, 2010

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Try redoing the "idle speed and mixture" process with the fuel filler cap off-- If that solves the problem your evap system is hosed (no pun intended.)

Posted on Jun 28, 2009

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Sounds like carb idle air or fuel jets are clogged.. Test pressure with a gauge to be sure. Float level and drop needs to be exact.. Operation of the whole carb relies on this. Probably why you are not getting any change in your air/fuel adjustments.

Posted on May 22, 2009

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