What could be the cause of cylinder misfire on a 2002 Honda Accord?
Yesterday the brother of my brother in law looked at my car because he works with cars. He noticed one cylinder was not plug in and then he began rearranging the 4 cylinders as it looked out of place and told me to start my car. It wouldn't turn on and he kept rearranging it until it turned my back on. And then I went and drove some and my car started shaking, which it hadn't done before. The check engine light wasn't on before. I got the codes checked and majority of the codes state a cylinder misfire. My car was working fine before and tomorrow I'm booked for a diagnostic test. But I feel like the problem might be very minor and I don't want to shell out lots of money for a test that they may not do anything
The problem is that your brilliant brother-in-law has the plug wires installed incorrectly. He has the firing order all wrong. Take it to a real mechanic and have the plug wires correctly installed. If you have not replaced the spark plugs and the car has over 90,000 miles on the odo then have the plugs replaced.
A misfire is caused by a lack of either fuel, spark, or compression, You can't rearrange the cylinders themselves in the engine. You can with the components that make them work, however. I think he was trying to confirm an ignition problem by switching coil packs around and see if the misfire moved from one cylinder to the other. The other thing that sticks out to me is you said your trouble codes indicate cylinder misfires like P0300 (random cylinder misfire detected). That indicates a central part that affects all the cylinders which could be things like low fuel pressure to a problem with the ECU. Shelling out money for testing isn't a waste of money because they do determine what the problems are and from there you can make decisions on going about fixing them.
Keep your brother and brother and all away from your car, neither one knows what there doing.
You let some idiot mess up your plug wires. Go to a Honda mechanic and they'll find the problem. Have the valves adjusted while your there. All Honda motors need the valves adjusted every 60,000 miles because they get tight.
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