- Joined
- 4 August 2017
- Messages
- 13
Hey guys! I'm solving an odd problem and figured I'd post here for anyone who may encounter a similar problem in the future. Here's what's going on:
Symptoms: car idles rough and has check engine light illuminated
Car was being driven when problem developed
we have the following diagnostic trouble codes present:
Current Fault Log
------------------
P0300: Random/Multiple Cylinder Misfire Detected
P1304: Misfire cylinder #4
P1305: Misfire cylinder #5
P1306: Misfire cylinder #6
Pending Fault Log
------------------
P1399 (what does this mean?)
Tests performed:
Compression: over 200 PSI indicated on all cylinders except number 4 which had 184 psi.
swapped coils from front to rear bank, no effect.
inspected O2 sensor readings on front and rear bank, O2 sensors both seem to be functioning properly, and indicate we are getting proper air fuel ratios with very little short term fuel trims on both banks.
I have no direct experience diagnosing misfires on the NSX until now, does the NSX detect misfires via crankshaft speed? if so I know that the crankshaft is actually slowing down when it should be speeding up. If the crankshaft sensor works off a toothed wheel with many teeth this would be the case. Does the NSX detect misfires via a knock sensor? if so, I may have more research to do.
My hypotheses are as follows:
bad sensor on bank for 4,5,6, (Ignition timing may be off, spark plugs firing too soon, firing too late, etc.)
clogged cat for bank 4,5,6, (I think this is unlikely)
mechanical engine issue for bank 4,5,6 (a shop stated that the car's timing belt may have jumped time, but I find this unlikely, I will double check this though)
Has any body else experienced a misfire all along one bank? I searched but could not find a similar case. If not, stick around for some entertainment while I solve this issue :biggrin:
Symptoms: car idles rough and has check engine light illuminated
Car was being driven when problem developed
we have the following diagnostic trouble codes present:
Current Fault Log
------------------
P0300: Random/Multiple Cylinder Misfire Detected
P1304: Misfire cylinder #4
P1305: Misfire cylinder #5
P1306: Misfire cylinder #6
Pending Fault Log
------------------
P1399 (what does this mean?)
Tests performed:
Compression: over 200 PSI indicated on all cylinders except number 4 which had 184 psi.
swapped coils from front to rear bank, no effect.
inspected O2 sensor readings on front and rear bank, O2 sensors both seem to be functioning properly, and indicate we are getting proper air fuel ratios with very little short term fuel trims on both banks.
I have no direct experience diagnosing misfires on the NSX until now, does the NSX detect misfires via crankshaft speed? if so I know that the crankshaft is actually slowing down when it should be speeding up. If the crankshaft sensor works off a toothed wheel with many teeth this would be the case. Does the NSX detect misfires via a knock sensor? if so, I may have more research to do.
My hypotheses are as follows:
bad sensor on bank for 4,5,6, (Ignition timing may be off, spark plugs firing too soon, firing too late, etc.)
clogged cat for bank 4,5,6, (I think this is unlikely)
mechanical engine issue for bank 4,5,6 (a shop stated that the car's timing belt may have jumped time, but I find this unlikely, I will double check this though)
Has any body else experienced a misfire all along one bank? I searched but could not find a similar case. If not, stick around for some entertainment while I solve this issue :biggrin: