My generic code reader says "random engine misfire" on cyl. 2,6, and 7. I replaced those three coil packs, and still the engine runs rough, especially at highway speed. I checked all plugs, and they are clean,excellent, and not loose. The idle rpm dropped to a steady 500 rpm. Any suggestions would be appreciated!!...Thanks, Clarence Watson
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SOURCE: idle issuse
You need to clear the codes from the ECM, and re-run diagnostic code. If you still have codes
Check your grounds. If you still have power issues, re-check your wiring or firing order. If you have spark only on 2-4-6, where is your 1 - 3 - 5. If I remember correctly those vehicles have double ignition modules. One for the right bank and one for the left bank. But not sure. When was the last time you change your spark plug wires? Your PCV? Fuel Filter? Air Filter?. As for your cam shaft sensor, run a coninuity test on the harness and ensure is working correcty. Why did you change the ECM, those things hardly go bad, unless you disconnected it while you had power going to it. Probably nothing wrong with the old one.
Ensure you don't have vacuum leaks (PCV Valve, EGR Valve) Check your fuel pressure if you can. Suggest you change fuel filter. Could be partially clogged and not allowing the proper atomization of fuel. (Also did you gap your plugs correctly or just threw them on as is?)
SOURCE: 2000 Camry 4 cyl 2.2L.
I have exactly the same problem and codes you listed on my 2000 Camry 4 cyl. I replaced the plugs which had no effect. My friend mechanic said the problem is deffinitely the wires and I could also need to replace the coil pack.
SOURCE: 2.2 ecotec engine. Code says random misfire. What
did you fix it? if you did what did you do? i have the same prblm thanks!
SOURCE: toyota 4 runner 1998, recurring
Hi! Pretty much a PCM (powertrain control module) problem. The PCM has connectivity on all electrical current that runs inside the car including the engine, transmission, accessories, etc. If the PCM is faulty something will surely fail, one good example is the bad reading on the scanner. Please try to swap PCM and see how it goes. Hope this helps and thank you for using FixYa!
SOURCE: 2002 saturn vue cylinder 1,3,5 misfiring when swapped coil pack it went away now cyl 2,6 misfiring.
having PO 304 = Misfire cylinder 4,PO 306 = Misfire cylinder 6, as I read above you have done the most. The thing that you have missed is to check whether the Catalytic Converter is faulty or not. To get an idea check whether you have a smell like rotten eggs at the end of the exhaust,you start having problems with cat and needs replacement. My advice before you go for a cat replacement is good to visit an MOT center and check your emissions and then you decide,
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