I've been chasing a slight low RPM miss for a while now on my '01 XJ. I've had the 0331 head replaced, cooling system is top notch and works great, also replaced my OE fuel injectors ~ 18 months back w/some re-built 784's.
This past week I replaced my Coil Pack w/a new one (fixed another issue I was having but the slight miss still seems to be there). Plugs are like new NGK's, Fuel Pressure is good.
It could be a placebo effect, but I'm wondering if it's a defective Injector. I ran a tube to each FI to listen for clicking to see if they were all firing when I replaced the Coil Pack and noticed the #6 FI is clicking much louder than any of the other 5. The 5 click nice a quiet and steady and the #6 injector was quite loud when listening to it. Almost like a pop vs click... if that makes sense.
This miss only seems present at idle or just off-idle and more so when the engine is cold. I haven't noticed a lack of power when giving it throttle, just the sound like a miss.
So... back to my question. Could it be a faulty injector and how does one test it w/just basic garage mechanic tools?
This past week I replaced my Coil Pack w/a new one (fixed another issue I was having but the slight miss still seems to be there). Plugs are like new NGK's, Fuel Pressure is good.
It could be a placebo effect, but I'm wondering if it's a defective Injector. I ran a tube to each FI to listen for clicking to see if they were all firing when I replaced the Coil Pack and noticed the #6 FI is clicking much louder than any of the other 5. The 5 click nice a quiet and steady and the #6 injector was quite loud when listening to it. Almost like a pop vs click... if that makes sense.
This miss only seems present at idle or just off-idle and more so when the engine is cold. I haven't noticed a lack of power when giving it throttle, just the sound like a miss.
So... back to my question. Could it be a faulty injector and how does one test it w/just basic garage mechanic tools?