#3 cylinder misfire - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 7 (permalink) Old 01-23-2007, 04:03 AM Thread Starter
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#3 cylinder misfire

'96 3.5L code 0303, #3 cylinder misfire. I changed the spark plugs yesterday after having this code last week. Got it again tonight. Any suggestions what to do next?
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post #2 of 7 (permalink) Old 01-23-2007, 09:29 AM
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in this order
1.spark plugs (youve already done)
2.spark plug wires
3.coil pack
4.fuel injector
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post #3 of 7 (permalink) Old 01-23-2007, 12:36 PM
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You can check the plug wires with a multimeter, they shouldn't have more than ~15Kohms/foot of resistance. You can check the coilpack but I don't remember the correct values.

You might have a leaking lower intake manifold gasket. This is not where the plenum meets the intake but where the intake meets the cylinders.

Once you do all that, I'd check the injectors.
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post #4 of 7 (permalink) Old 01-24-2007, 08:56 AM
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could also be a lower intake gasket leak, 3.5's are known for those leaking
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post #5 of 7 (permalink) Old 01-24-2007, 09:24 AM
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Here'a a how-to on testing the coil pack:

Coil Test

See Figures 2, 3 and 4


Fig. 2: The ignition coil connection terminal descriptions




Fig. 3: Check the primary resistance at the electrical connection and the secondary resistance across the coil towers




Fig. 4: Ignition coil terminal identification



Coil one fires cylinders 1 and 4, coil two fires cylinders 2 and 5, coil three fires cylinders 3 and 6 for the 3.3L and 3.5L engines. Each coil tower is labeled with the number of the corresponding cylinder.

Unplug the ignition cables from the coil terminals and the spark plugs. Make certain to label them before removal. Measure the resistance of the cables. Resistance must be between 3,000-12,000 ohms per ft. (30.5 cm) of cable. Replace any cable not within tolerance.

Unplug the electrical wiring harness connector from the coil pack.

Measure the primary resistance of each coil. At the coil, connect an ohmmeter between the B+ pin and the pin corresponding to the cylinders in question. Resistance on the primary side of each coil should be 0.45-0.65 ohms at 21-27C (70-80F). A coil not allowed to cool down, could result in inaccurate measurement results. Replace the coil with a new one if the resistance is not within tolerance.

Remove the ignition cables from the secondary towers of the coil. Measure the secondary resistance of the coil between the towers of each individual coil. Resistance for these engines depends on which manufacturer made the coil being tested. If the coil was manufactured by Diamond, the resistance should be 7000-15,800 ohms; if the coil was made by Toyodenso, the resistance should be 7000-15,800 ohms. If the coils' resistance are not within specifications, the coil must be replaced.


2003 Jeep Grand Cherokee my current DD

1995 3.5L Intrepid, Sold in 2010
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post #6 of 7 (permalink) Old 01-27-2007, 08:16 PM Thread Starter
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The fix was the plug wires. I measured their resistance, all were about 13K ohms. I measured the primary resistance of each coil, they were 1.5 ohms each. I measured the secondary resistance of each coil and they were each 9K to 10K ohms. I replaced the plugs first, and that didn't fix the misfire. I found that the #3 injector had a broken wire, so that was also fixed, but still had the 0303 code. Turns out that the plug wires were old and connecting to their posts very well any more. Two of them had fallen off the coil pack! Thanks for your help guys.
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post #7 of 7 (permalink) Old 01-29-2007, 04:12 PM
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That's why you can't check them with a multimeter. All that does is tell you if they have resistance or continuity and not if they will short to ground. Only a megger can test for that.

Cheers,

Joe Electrician

Last edited by stlrj; 01-29-2007 at 04:14 PM.
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