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1996 Ls 400 Cyl 6 Not Firing Code


BarryHalls

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I read some of the earlier postings from others that have had this issue. It appears the problem can be one or more of several problems. I just wanted so advise on where I should look next.

This is on a 1996 LS400, The car started idleing rough and had a strong fuel smell. I checked the codes and only one came back I believe P0306, cyl 6 not firing. Checked and then replaced plugs(NGR) and wires. Drove fine for a few miles and started again.

I figure I need to replace the cap and rotors next. I also need to see if any of the caps are leaking in my ECU. (not sure where that is exactly) I also read that it could be an injector. Any help would be great.

Thanks,

Scott

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A single cylinder misfire is unusual as each distributor feeds 4 cylinders (2 on each bank).

One cylinder down wouldn't cause extremely rough idling.

I would check both coils as these are known for failure especially the driver's side one.

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Welcome Scott.

Yes, I would begin by replacing caps/rotors as normal maintenance. A bad coil should not target one particular cylinder. However, you could swap the coils and see if the issue jumps to the other bank of cylinders. I also doubt that it is a bad injector because you DO get a strong fuel smell, meaning the injector is injecting fuel. I doubt it is ECU caps as that would affect more than one cylinder. Cap/rotor is the main suspect here.

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Just got back in town and was wanting to get this knocked out. I have the caps and rotors and have started to replace them. I was looking to find a guide or maybe a diagram. I just don't want to make this harder or forget something etc. Thanks again for your help,

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Put the crank at TDC with cams aligned(cam marks align every two revs of the crank). Then RH side rotor points to 9 o'clock and LH(drivers side) points to approx. 5:30. Verify all of this BEFORE you pull the existing rotors and put it back the same. You should be golden WRT the rotors.

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There should be a tutorial on www.lexls.com for the caps and rotor replacement.

Indeed there is, Steve -> http://www.lexls.com/tutorials/ignition/distributor_rotor.html

However, I would never take off all of the stuff that the tutorial suggests. Sure it makes for easier access but what an added hassle. Different strokes for different mechanics, I guess.

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