Quote:
Originally Posted by theallpowerfulme
Hey guys I have a little problem:
I have a 92 Maxima with the SOHC motor 135k miles, no CEL. I had a misfire develop that presents itself at all throttle positions and coolant temps. I could pull the ign wire from the middle plug on the front cylinder bank ( I think this is cyl #3?) and it would NOT affect the idle. This tells me that this is the dead cylinder, as pulling the other wires off of their respective plugs WOULD drastically change the way that the engine ran. I pulled all the spark plugs and the plug for this cyl was very fouled while the others were clean.
The following parts were then changed:
Spark Plugs
Coil
Dist. Cap and Rotor Button
Ign. Wires
After all of this, the problem remained, unaltered
I then swapped all six injectors and the rails with some from another car (and obviously replaed the intake manifold gaskets), I also replaced most of the vac lines since they were very brittle.
After this the problem remained. I then unhooked the battery for a few hours, and hooked it back up. The car ran MUCH better, with a slight misfire that was intermittent. I mean the car ran perfectly, with a slight hiccup that rarely occured.
Today the problem returned. Dead cyl, (the one I assume is #3, the one in the middle of the front bank) misfires always. I have found a couple of threads that express a similar problem, but the solution was never posted. Any ideas? Something I am missing? other threads pointed to the Knock sensor, or the coolant temp sensor, but this was never confirmed or denied. I am tired of swapping parts when they dont solve the problem. Help would be very appreciated!
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did you perform a resistance test on the injectors that came out, and the ones that went in? they should be 10-14 ohms between the 2 pins. it's possible your just-installed injector on one of the cylinders just happened to be bad... since the rail came from another car, rather than being brand new injectors, you never know if one of the injectors was just about to crap out. so perhaps if you locate the bad injector, just take one of your old ones that wasn't on #3 (if you still have them around) and just swap that one injector into the place of the bad one you have now, IF that is the problem. otherwise it would have to be a dirty injector plug, causing poor electrical connection, or bad wiring back to the ECU. but based on the fact that it ran well and just flared up again... i'd look at the current injectors' resistances first.