Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
When it is misfiring is the scan tool showing all cylinders misfiring?
Where did you connect the pressure gauge?
Did the pressure ever fluctuate while monitoring it?
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It appears its not an engine issue but a signal concern from the computer to the coils and injectors. Do you have access to an oscilloscope to check the coil and injector signal? Will your scan tool monitor the cam and crank sensor signals to see if there is a hiccup in there reading? What is the idle speed?
If you monitor and increase the idle to 800 does the miss go away. 650 is a tad low for hot idle speed.
Coolant to the throttle body is to prevent condensation from freezing. If this concern is occurring above 32 degrees then that is not to blame. Let me know the results at 800 and the CKP and CMP monitoring and oscilloscope test to see which is dropping out. So far a throttle body concern or computer concern looks to be to blame causing low idle and this miss.
Nothing is said on how random misfires need to be to set the random misfire 0300 code. How did you come out on the oscilloscope tests and speed sensor monitoring to find out why its misfiring?
I have looked over all the TSBs for this model and none are for the concerns you have mentioned.
Is the temp staying at 213 or fluctuating up and down?
Did you ever monitor the coil and injector signals to see if any are dropping out, if not then we know its the engine to blame.
Based on the most recent info, it is running warmer than it should normally. Although 213 is within limits, 200 is more expected. Does it misfire on cold start prior to getting to 213 degrees?
A compression and leak down test is needed now.
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Thanks for the update. Keep in touch if needed.