Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello my name is ***** ***** thank you for your question.
Did you get gas recently?
You mentioned you checked compression. What is the compression readings you are getting?
Compression should be around 185 psi. 148 is the minimum. So if you have 120 psi of compression, you may have a internal engine issue and it doesn't have the proper amount of compression to ignite the fuel. That is why the spark plugs are getting wet.
Try disabling the fuel system by pulling the fuel pump fuse out of the IPDM and turn the engine over a few times, then recheck compression and see if it goes up. If not, then you have internal engine issues. Hopefully by disabling the fuel system it will dry the cylinders so it can see the actual compression . If there is unburned fuel in the cylinder it can wash out the cylinder walls and lower compression .
But you need to do this to determine if the engine is good or not first!
If you have after market sensors, that can certainly cause intermittent spark and not throw codes.
Was this engine rebuilt?
Did you change this engine?
That is much more information that should have been outlined in your question.
You are providing new information, so I am trying to take all that in to help you. This 3rd time, is it the same engine? Was it rebuilt 3 times?
Where did you get the sensor you installed? Also did you change the back timing cover gasket that blows out lowering the oil pressure?
If you have a After Market Sensor, it can produce intermittent spark. Also keep in mind, when checking for spark, it's not a heavy deep spark. It's actually fairly light and faint. But even if you were getting spark, the 120 to 130 compression is to low. The Minimum is 148
Or if the fly wheel was chipped when installing, that could do that as well since the crank sensor reads off the signal place of the flywheel.
I am not guessing at all. Keep in mind, I am not there to see everything you did. I have encountered after market sensors many times not producing spark properly. Plus I know the signal plate is the inside ring, and of course when you are installing a engine you can chip the signal plate if you bump trying to line up the engine. I have seen that!
You just told me you have low compression. That will keep it from firing also and cause the plugs to get soaked if it cant' burn the fuel.
What did you change the 3rd time you did the engine from the first 2?
That sound about right for the spark. It's not like a 4 cylinder where you see it almost every revolution.
You will see a spark when checking one cylinder every 3rd revolution or so. If you monitored spark on all 6 cylinders at once, you would see the spark is most likely there.
But what did you do to the engine on the 3rd time different than the first 2? You said it ran the first 2 times, but not the 3rd. So other than the low compression, I am trying to determine what else you may have done to cause the issue you are having now.
No problem. I will opt out and open this question back up to another expert and see if they can help you.
Keep in mind, I have been a Nissan tech for 26 years and the information I am asking for will most likely be asked by others.
I wish you luck and just wait for a reply from another expert