1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Backfires, stutter, low power

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Old 03-04-08, 02:50 PM
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Question Backfires, stutter, low power

Hey guys just joined, I did some searching but didn't find much.

Car is a 84 rx-7 gs with 12a motor, 5spd, 147k miles engine was rebuilt 5yrs ago (supposedly)

Recently the car started running poorly, lots of backfiring, stuttering and hesitation, much less power @ lower rpms. Stalls and idles lower than before (before 1100 now 800)

plugs, cap, rotor rerplaced 3 mos ago

fuel economy is poor and exaust smells like raw fuel

Any pointers of which directtion to look would be great.

Thanks!
Old 03-04-08, 02:59 PM
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sounds like your float could be stuck, your deffinatly running rich, so i'd suggest searching for carb fixes.
Old 03-04-08, 04:18 PM
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Need to check emissions crap before the carb. Shutter valve and maybe the AAV valves. Procedure to check them is in the manual, link in FAQ.
Old 03-04-08, 06:06 PM
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Sounds like the same issue i had before I had the carb rebuilt. There was alot of carbon buildup in the intake and I had the same issues of stuttering, low power, and smelly backfires. I also had the ratsnest removed and the air pump.
Old 03-04-08, 08:24 PM
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I had very similar experience. MazdaTrix in Signal Hill, CA rebuilt my carburator and all has been good since (8 mo's later).
Old 03-05-08, 06:15 AM
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Don't even touch the carb until you have tested both AAV's and the shutter valve. Unless you like to waste time and money.
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