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PostPosted: Sat Feb 04, 2012 8:50 pm 
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Posts like an LN3
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Joined: Thu Feb 18, 2010 4:56 pm
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Location: Savannah, Georgia
Year and Trim: 2001 SSEi
When I first noticed a misfire under hard acceleration or under a load, I had the following codes: P0336, P0420, Po420. I have removed my cat, so I assumed the Po442 was because of no Catalytic converter. I occasionally get the "check gas cap" code and haven't checked everything out on that, so I figure that's the cause of the Po442 code. So, I figured my misfire and tach not working must be because of the Po336 code.
I replaced the Crankshaft Position Sensor today, but still have the same problem. I cleaned the contacts on the plug and the wires look good. Basically, I live on an island and go over quite a few bridges when I "come in to town" and when I go over big bridges, I get the misfire and the tach jumps all around or goes to zero. I occasionally pull a small trailer to haul lumber to jobsites. When I pull the trailer, I get the misfire and tach issues everytime I accelerate from a dead stop.
I had the care scanned after I did the work and got the same codes as before. They erased the codes and I drove about 30 miles to get home. The problem is still there, but the SES light never came back on.
Any ideas would be greatly appreciated.


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PostPosted: Sun Feb 05, 2012 10:31 pm 
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With a cat (which you really should have), it will set the P0420. The P0336 indicates that the 18x signal is not being read. Check the connections, and routing of the harness. Make certain it is not near any of the plug wires, where they may arc to it. Check the coils for cracks. A bad ICM can also be the problem, as the crank signal passes through it.

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PostPosted: Mon Feb 06, 2012 1:19 am 
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Posts like an LN3
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Joined: Thu Feb 18, 2010 4:56 pm
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Location: Savannah, Georgia
Year and Trim: 2001 SSEi
Thanks,
Do you know if the wires go straight from the ECU to the crank sensor? In other words can i unplug the wires from the sensor and the ecu and do a continuity test at each end of the harness? Will the wires be the same color from one end to the other? One more thing, do O2 emulators really work? Other than the code showing up, is there a problem with removing the catalytic converter? I simply do not have the cash to replace the converter. It is actually still there, but I have gutted it.
Thanks again for your help.


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PostPosted: Mon Feb 06, 2012 2:37 pm 
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They go through the ICM, as Archon stated in his last post.

Yes, O2 sim's work.

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PostPosted: Mon Feb 06, 2012 6:18 pm 
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Location: Savannah, Georgia
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My bad, ICM.
So, do the wires go straight from the ICM to the crankshaft position sensor? In other words are the wires the same color at the ICM as they are at the crank sensor?


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PostPosted: Mon Feb 06, 2012 6:36 pm 
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This is the diagram, including wire colors, that should help you out.
Attachment:
CrankSensSchem.gif
CrankSensSchem.gif [ 59.84 KiB | Viewed 1954 times ]

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*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.


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PostPosted: Mon Feb 06, 2012 8:08 pm 
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Posts like an LN3
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Year and Trim: 2001 SSEi
Fantastic!
Thanks for the help!


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