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I have a 99 Accord ULEV 4 cyl 170k miles automatic that had started running rough and gave me cyl 4 misfire and multiple misfire codes. EDIT: A little quick history:
It started with a code of random misfire but seemed to run fine so I ignored it. I noticed it wasnt getting the mpg it used to. It also shut completely down twice on me while I was driving and I had to coast to the side of the road. I sat for a few minutes and it cranked right back up like nothing ever happened each time. Weird. We drove it on a 2.5 hour trip and on the way back it strted running rough with horrible idle. It would drive ok when at 55-65 but idled really rough. THen it had the multiple/random misfire and cyl 4 misfire codes. Thats when I started replacing things.
Going with the advice of the master mechanic at Autozone I replaced the cap, rotor, wires and plugs. Cranked her up and....still extremely rough and smells like fuel. I went back and he suggested I unplug each fuel injector to test them. I did and cylinder 3 did nothing when I unplugged it. So I bought a new injector, installed it, cranked her up and....frick, still running like crap. What the french toast?! What sends a signal to each injector and what would make an injector not work?
I know, I should have just paid the $70 to the local mechaninc for the official diagnosis!
It started with a code of random misfire but seemed to run fine so I ignored it. I noticed it wasnt getting the mpg it used to. It also shut completely down twice on me while I was driving and I had to coast to the side of the road. I sat for a few minutes and it cranked right back up like nothing ever happened each time. Weird. We drove it on a 2.5 hour trip and on the way back it strted running rough with horrible idle. It would drive ok when at 55-65 but idled really rough. THen it had the multiple/random misfire and cyl 4 misfire codes. Thats when I started replacing things.
Going with the advice of the master mechanic at Autozone I replaced the cap, rotor, wires and plugs. Cranked her up and....still extremely rough and smells like fuel. I went back and he suggested I unplug each fuel injector to test them. I did and cylinder 3 did nothing when I unplugged it. So I bought a new injector, installed it, cranked her up and....frick, still running like crap. What the french toast?! What sends a signal to each injector and what would make an injector not work?
I know, I should have just paid the $70 to the local mechaninc for the official diagnosis!