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Jerking, bucking when accelerating

Old 06-24-18, 09:38 AM
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Jerking, bucking when accelerating

My 17 yr old son is new to the rotary engine cars . Just bought a 1990 rx7 13b. The car starts great but once you get going down the road, at acceleration the car starts bucking ( sorry, lack of better wording). Thinking it may be a bad TPS or plugs but I need advise. I work on all our vehicles myself but never have had a rotary motor and don't have a clue how to diagnose problems. ANY advise would be greatly appreciated.. Thank You in advance.
Old 06-25-18, 04:36 PM
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I have a rotary addiction

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TPS is a common failure component that will cause severe bucking and backfiring. Try setting adjustment on it using the factory service manual method listed on foxed.ca. Second thing I would check is ignition timing.
Old 06-25-18, 10:01 PM
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Was there a point in the recent past when it didn't hesitate or buck? It would be nice to have a bit more info.
Old 06-26-18, 08:54 AM
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Old 06-26-18, 10:27 PM
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Originally Posted by Acesanugal
lol is that you?

Last edited by Rotary Alkymist; 06-26-18 at 10:34 PM.
Old 08-03-18, 10:29 PM
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Check the MAF sensor as well (function in addition to just making sure that it’s securely connected). I recall accidentally leaving mine off while doing some other work, and then taking it for a test drive. Was scared that I’d broken something, but turned out that we just hadn’t plugged the MAF back in after a long night of tinkering...
Old 08-04-18, 11:00 AM
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Technically these cars have airflow meters 'AFM'.

And yes alkymist, it sure is.


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