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86 Mazda rx7 with the 13b engine it is running rich in the back 2 cylinders can not figure out why does anyone have an answer?
Wiki User
∙ 16y ago
erm, dude. if this is a 13b engine it wont have cylinders or pistons, its a wankel (rotary) engine. wont even have a valves. you get two specifically shapped triangles (called rotors) inside a trochoidal shaped housing which are mounted on an eccentric shaft - similar in operation to the crank shaft of a piston engine. search rotary engine illustrated on Google and this should show how the engines internals move around in comarison to each other part. if this engine does indeed have cylinders then it has had an engine swap at some point which makes your job a hell of alot easier as the need for a specialist to look at it is now longer a necessity. if it is indeed the rotary engine that came with the car then i would seek an RX7 specialist as in my experience (this is not meant as an insult) if you dont know what your doing with these car you end up breaking more than your fix. but if you really want to have a stab at it yourself then see the below thing it could possibly be. Leaky Injector Low Compression on one/both Rotor(s) (should be 100-85psi Map Sensor giving false or no info Coolant Temp Sensor giving false or no info faulty ECU - usually realted to a burnt out resistor on the mother board. coroded wiring tuned Incorrectly - either by incorrect mapping or timing set incorrectly.
Wiki User
∙ 16y ago
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