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1996 Dodge Intrepid P0304/FLASH CODE 43 #4 MISFIRE

Tiny
OLDTECH81
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  • 1996 DODGE INTREPID
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
#4 misifires at all temps. #1 (companion cyl on coil pack) is not.

Has new spark plugs in it. Also have moved plugs around from cylinder that does not misfire to the #4. #4 still has misfire. Has new #4 injector. Fuel press key on - engine off is 40 psi. Vacuum at idle is 18" and steady.

Plug wire is 12kohm from coil pack to plug. Don't see any bad spots or arching on it.

Primary coil circuits are
batt to 3/6 is.5ohm
batt to 1/4 is.5ohm
batt to 2/5 is.5ohm

Secondary coil circuits are
3-6 12250ohm
1-4 12250ohm
2-5 12270ohm

This started suddenly after an oil change. Don't know that the oil change is associated with the problem, but may be relevant. The engine isn't making any unusual noises from the valve train or lower end
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Sunday, January 17th, 2010 AT 1:33 PM

8 Replies

Tiny
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Check cyl. No.4 compression both dry and wet tests
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Sunday, January 17th, 2010 AT 2:30 PM
Tiny
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Planning that for tonight after work. Wouldn't a bad cylinder cause the vacuum reading to oscillate?

Vacuum is 18" and steady.

Thanks
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Sunday, January 17th, 2010 AT 2:34 PM
Tiny
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Yes it will fluctuate when the miss hits-
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Sunday, January 17th, 2010 AT 3:45 PM
Tiny
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I'm not sold on the compression idea due to the steady vacuum reading.

I plan to do a compression test as a matter of elimination. I'm not expecting to find a problem.

Do you have other ideas on this thing?
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Sunday, January 17th, 2010 AT 4:07 PM
Tiny
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Flash code 43? Did you pull this code

In my book for Chrysler -DTC 43 Fault in ignition coil control circuit.
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Sunday, January 17th, 2010 AT 4:15 PM
Tiny
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The DTC 43 is a flash code triggered with the key switch. The P0304 is from my OBD II scanner. I pulled both codes.

43 is "peak primary circuit current not achieved with maximum dwell time." Been down the road on this one when the capacitor in the harness died. It's got a new capacitor in it on general principle. It checked to be ok on the ohm meter.

I have verified physically that the #4 cylinder is not firing while the other 5 are.

Thanks
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Sunday, January 17th, 2010 AT 5:14 PM
Tiny
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Have you checked the camshaft position sensor-

When you check no.4 do you have spark and injection? Dead cyl will be one or the other. I'll wait for the compression results-You beginning to make me wonder on this misfire-curiosity can you check the injector solenoid resistance
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Sunday, January 17th, 2010 AT 6:35 PM
Tiny
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Injector solenoids check ok by ohm meter.

Isolated the problem to the plug wire. Got curious and plugged in an old one from my tool box and it quit missing. Took the old wire out and don't see anything wrong with it. New plug wires solved the problem.

I've never seen those codes with the 43 trouble code.

Thanks
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Monday, January 18th, 2010 AT 6:36 AM

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