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I've been chasing a misfire all day, and I think I know what the issue is, so I'm posting here so I can get a second or third opinion on it before I do something stupid and burn up the ecu.
The code is a random misfire most of the time, occasionally it will come up as a misfire on cyl 2. I checked the spark plug, and wire, by grounding the plug on the exhaust manifold and cranking the car over. Unplugging the wire with the car running doesn't change the cars idle, but it does if you unplug 1,3,&4.
With my stethascope I listened to all the injectors, #2 is not clicking. I swapped in an injector I had laying around, and it's the same thing, so I swapped in a second injector..same deal, misfire on cyl #2.
I tested the resistance of the injectors, they're all within spec, even the other ones I swapped.
I checked for +12v at the yellow wire on cyl 1 & 2, and it's getting constant 12v.
I tried to check for the ecu ground but I can't figure that out...so I swapped the plug from injector 1 to injector 2, and #2 is clicking.
So the problem is the injector on cylinder #2 isn't being told to open, there's a short in the wire -OR- the ecu is broke?
I tested continuity from the ground lead at the injector back to the socket for the injector harness, and it's got continuity.
So now my dilemma is what to do next to fix this, or how do I go about finding this short. cylinders 1&3 and cylinders 2/4 should fire simultaneously since this is a batch fire type of vehicle right? Would it be okay if I spliced a jumper from the ground signal to cylinder 4 to the wire on cylinder 2, or would that have bad repercussions?
Is there an easy way to fix this...like jumping ground from one to the other?
The code is a random misfire most of the time, occasionally it will come up as a misfire on cyl 2. I checked the spark plug, and wire, by grounding the plug on the exhaust manifold and cranking the car over. Unplugging the wire with the car running doesn't change the cars idle, but it does if you unplug 1,3,&4.
With my stethascope I listened to all the injectors, #2 is not clicking. I swapped in an injector I had laying around, and it's the same thing, so I swapped in a second injector..same deal, misfire on cyl #2.
I tested the resistance of the injectors, they're all within spec, even the other ones I swapped.
I checked for +12v at the yellow wire on cyl 1 & 2, and it's getting constant 12v.
I tried to check for the ecu ground but I can't figure that out...so I swapped the plug from injector 1 to injector 2, and #2 is clicking.
So the problem is the injector on cylinder #2 isn't being told to open, there's a short in the wire -OR- the ecu is broke?
I tested continuity from the ground lead at the injector back to the socket for the injector harness, and it's got continuity.
So now my dilemma is what to do next to fix this, or how do I go about finding this short. cylinders 1&3 and cylinders 2/4 should fire simultaneously since this is a batch fire type of vehicle right? Would it be okay if I spliced a jumper from the ground signal to cylinder 4 to the wire on cylinder 2, or would that have bad repercussions?
Is there an easy way to fix this...like jumping ground from one to the other?
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