misfiring problem
#1
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misfiring problem
My 87 rx7 will randomly start misfiring sometimes it will stop after a few minutes and other times it wont stop. just recently i figured out if i unplug the trailing spark plugs from the coil when the car is running it will ark very weakly a few times then there will be a very strong ark and the misfiring stops this method of stopping the misfiring has worked for the last few months also if i leave the coil disconnected it doesn't ever misfire. What could be wrong? any help would be awesome thanks
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I talked to this guy with a turbo rx7 and he said it could be the injectors not working properly and that having both coils plugged in would be to much spark for the amount of fuel
#6
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I guess its possible the injectors aren't firing proper but to effect the spark because of low fuel sounds like a bunch of hooey to me ,but I suppose anything is possible . what kind of ignition do you have ? You can run without trailing . check your leading side and make sure all grounds are GOOD. Check power in your coil power feed ( + ) side wires and make sure they are tight and clean , check your plugs if they are dirty or corroded change them . Same with the plug wires . Check the wire connector at the crank angle sensor and make sure they are all connecting proper ( sometimes the plug pins get pushed back out of the connector and barely make contact . ) Make sure you check all the wires for continuity in case one is broken inside the insulation . Make sure there is nothing stuck on the spur and the pickup sensor in the ( Dare I say it ) dizzy and that there is a bit of a gap (credit card thickness ). One more thing check the power wires going to the coils and make sure they are getting full 12 + volts . That will get you started .Gerald m.
Last edited by gerald m; 02-04-13 at 04:40 PM.
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I believe it is the stock ignition and i have been driving the car around with the trailing coil disconnected but i will make sure to check the things you suggested. thank you
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where would i locate the crank angle sensor and i'd also like to let you know that it only runs funny if the trailing coil spark plug wires are plugged in
#9
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Check and make sure the leading wires are on the leading spark plugs and the trailing wires on the trailing spark plugs after you check the FSM's out a bit
Last edited by gerald m; 02-11-13 at 08:25 AM.
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I am almost convinced the the trailing plugs are firing before the leading in turn screwing up the compression and fuel mixtures on both rotors . no offense but you seem awful sure of your wiring etc. for someone that doesn't know what a crank angle sensor is . Gerald m.
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Continuity is all well and good for certain applications but wont tell you if only half of the wires are broken or if there is corrosion inside the insulation causing resistance. You need to check resistance if you're looking for weak voltage. Continuity tells you yes or no, nothing in between.
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Continuity is all well and good for certain applications but wont tell you if only half of the wires are broken or if there is corrosion inside the insulation causing resistance. You need to check resistance if you're looking for weak voltage. Continuity tells you yes or no, nothing in between.
#22
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I don't remember saying anything about corrosion that is what I was suggesting to check and make sure there was no broken wires . A broken wire more often than not has off and on symptoms If you don't have something constructive then maybe you should keep it to yourself . Gerald m.
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