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Old 06-24-2010, 03:24 PM
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Reading my plugs.. confused.

Hi guys, i have a question about my 383 again. I have a distributor issue as I have found out and i did a little more testing. I noticed that when i connect my timing light to the wires, i have a nice constant beat to the light on all wires except for #2 cylinder.

I was reading the plugs, but got to hot outside so i decided to come inside to cool off and ask this question. Ive checked these plugs so far: #1,2,3, and 7. #1 has a nice tan color, but 2 and 3 were black and soaking wet. #7 was just very smutty black. The car is running rough and the engine tries to die out when cylinder 2 skips a beat every bit. Im doing more tests in a bit, but would these symptoms be the culprit for my car running so rough for so long? Also ive noticed my oil turns black within only a few hundred miles. Ive replaced everything in the engine, but the distributor itself. Thanks guys, you have always been helpful.

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Old 06-24-2010, 03:29 PM
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Black oil - Do you have a PCV connected to the carb and a proper Breather in the opposite valve cover? and are they both clean and in working order? No/malfunctioning PCV = black oil very quickly

#2 cyl - the easiest and cheapest fix may be a bad plug wire.. take a wire from another cylinder and put it on #2 to see if you have the same symptom with the timing light

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Originally Posted by stroker444
Hi guys, i have a question about my 383 again. I have a distributor issue as I have found out and i did a little more testing. I noticed that when i connect my timing light to the wires, i have a nice constant beat to the light on all wires except for #2 cylinder.

I was reading the plugs, but got to hot outside so i decided to come inside to cool off and ask this question. Ive checked these plugs so far: #1,2,3, and 7. #1 has a nice tan color, but 2 and 3 were black and soaking wet. #7 was just very smutty black. The car is running rough and the engine tries to die out when cylinder 2 skips a beat every bit. Im doing more tests in a bit, but would these symptoms be the culprit for my car running so rough for so long? Also ive noticed my oil turns black within only a few hundred miles. Ive replaced everything in the engine, but the distributor itself. Thanks guys, you have always been helpful.
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Old 06-24-2010, 11:22 PM
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I did some more work. #1 and 4 were the only two that were a light tan color. I found that the #2 plug wire has issues, it intermittently opens when testing with ohm meter. I took the igntion module to autozone to have it tested and they said its good. I checked the pickup coil myself, and i believe its defective. I heard that it should read somewhere between 500 and 1500 ohms and stay steady when using the vacuum advance or wiggling the wires. It dosent stay still, it varies by up to 100 ohms. Does this mean i need a new pickup coil? I also bought some new plugs today, i dont know alot about plugs, but i bought stock ac delco replacemtents for a stock tpi 5.7.
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Old 06-25-2010, 08:30 AM
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better way to test pickup coil

The best way to test a pick up coil is with a DSO. Since, you donnt have one of these you will have to do the second best test. Using your multi-meter disconnect and probe both wires from the pickup coil. Set your meter to the VAC scale. We will be looking for at least 300mv or 0.3volts with the engine cranking. That is a more definite test. Honestly, you have already taken the ignition apart so why not replace the pickup coil and module. Sounds like you need a new set of wires also. They are not that expensive.
Once you straighten out the ignition and get another set of plugs post your readings and then you can determine if more needs to be done.
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