1991 Rx7 - I'm gonna cry

1991 MAZDA RX7
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PENELOPE
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I bought a 1991 Mazda Rx7 CONVERTIBLE! my first. trani slipped after two weeks so replaced. ran great. two days later wont crank over. just makes the sound it wants to fire but never gets enough UMPH to actually start. WHY WHY WHY? fuel injectors ordered for 91 Rx7 and they arent same size WAAHHHH whats up with my new car? help me I'm losin it!
Jan 13, 2006 at 6:32 AM
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NNPLAYAZ
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When you bought the transmission, did you make sure that it would work fine with your engine. The reason I say this is because I have a 1993 Mazda 626 that I want to do a trans swap. I went out to buy a trans for a 93 (same as my car) but there are two types of transmissions, the "new style" and "old Style" i really dont know what this means but the trans will fit but wont work. Verify the numbers on your new trans with the numbers on your old trans. If they have the first few number match then the trans is fine.
Also, if your car started before, the your problem is your starter. With a bad starter, your car will try to turn on but it will never do so since it will never get enough power. You can also check your spark plugs and spark plug wires, with are the things that start your engine.
Jan 13, 2006 at 9:20 AM
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TRIPOD67
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it cranks over fine. It just wont start. The fuel injectors are spraying so much fuel it soaks the spark plugs instantly. It is getting spark to the leading and trailing plugs. It just is dumping so much fuel that it doesnt have a chance to fire. My thoughts are with the mass airflow sensor, but that should only come into play when car achieves closed loop right? could the secondary injectors be spraying fuel during cranking also? :?
Jan 14, 2006 at 9:08 AM
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10FOTUCK
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Well, your transmission doesnt have anything to with your car not starting. However, it sounds like you are getting plenty of fuel but no fire to the spark plugs.Start at your distributor cap one of the wires will go to the source that gives you fire make sure it firing. It should be a little smaller than a beer can that is called your coil pack. Put the plug wire that comes off the coil pack to some metal and turn the car over looking for a spark to the metal. If no spark then your coil pack went out. If your computer went out it wouldnt do anything. The lights would come on inside the car but thats about it.
Jan 15, 2006 at 8:54 AM
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COSMO
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HAHAHA....have a compression test done to the motor. The engine is either blown or simply flooded. RX-7 motors are notorious for flooding after sittign for a few days. Have the engine deflooded first and have a fresh set of plugs put in it, plus do an oil change. Rx-7's inject a crap load of fuel....so I would steer away from the injectors, I have not had to replace that many of them myself, and even then they had leak down problems NOT over injection.

Cosmo...mazda tech
Jan 15, 2006 at 12:18 PM
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TRIPOD67
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:roll:
Jan 16, 2006 at 3:04 PM
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TRIPOD67
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That was it Cosmo. Cant belive how flooded it was. Changed oil and filter, plugs, and cranked all the fuel out of the rotors. I have never seen a car flood like that. Not injected car anyways. They just do that for no reason? :shock: Or did maybe she held the throttle during cranking, flooded it and fouled the plugs that quick? oh I get no drop on the fuel rail for like 14 minutes, so I dont think it's got a leaking injector.


anyways thanks.. :D i sent you a pm.
Jan 16, 2006 at 7:33 PM
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Suggested Repair

Deflood the engine, install a fresh set of spark plugs, and change the oil and filter. RX-7 engines are prone to flooding after sitting and can dump enough fuel to foul the plugs. If it still will not start after deflooding, perform a compression test to check for engine damage.

Conversation Summary

A 1991 Mazda RX-7 convertible would not start after a recent transmission replacement, cranking but failing to fire. The owner reported heavy fuel delivery soaking the plugs despite spark at the leading and trailing plugs, and questioned the MAF, secondary injectors, and injector fitment. Other users suggested checking the transmission match, starter, plugs, wires, and coil. The Mazda technician said the transmission was unrelated and that the engine was likely flooded or, less likely, had low compression. RX-7s commonly flood after sitting and inject a large amount of fuel, so injectors were not the first concern. The recommended steps were to deflood the engine, fit fresh plugs, and change the oil, with a compression test if needed. The owner confirmed severe flooding and resolved it by changing the oil and filter, replacing the plugs, and cranking the fuel out of the rotors. Fuel-rail pressure held, so a leaking injector was not indicated.

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