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[quote=”AaronMartinSole” post=45602]
I got a weird spark plug pattern. Pulled the plugs today to do the valve adjustment (took a long time but great success!) and one plug was clear white, one was all black, and the other two were a little black only on one side. Who knows. Maybe I should do a spark test, because I read that you can tell a lot from the frequency and all of that of the spark.
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Had a 92′ 4dr. Honda Civic EX also. It had 300,000 miles or more on it and wouldn’t pass smog. I did a whole bunch of stuff to it and it also wouldn’t pass. The tune up included new spark plugs. In the end I gave up and dropped the car at dad’s and bought another used Honda civic. Dad, being retired thought he’d give it a shot. He changed the plugs again. Fixed some leaky hoses and it passed.
The new plugs were defective. Its rare. And it was the second time I had bought faulty plugs. They were NGK. Yes I opted for the cheapos. haha.
Check for spark even though you have new plugs. If one of the plugs is too clean, you may not be getting spark. Also pull off the distributor cap and use emery cloth or fine sand paper to sand down the needle as well as the points on the inner distributor.
I even tried using the ‘denatured alcohol’ trick, it brought down my HC to zero. The smog tech had a curious look to his face. My other numbers failed though. I passed the 4th test after a SECOND set of new plugs. I wouldn’t suggest alcohol either. Its bad for the rubber in the fuel lines and seals.
good luck on your next test!
[quote=”AaronMartinSole” post=45602]
I got a weird spark plug pattern. Pulled the plugs today to do the valve adjustment (took a long time but great success!) and one plug was clear white, one was all black, and the other two were a little black only on one side. Who knows. Maybe I should do a spark test, because I read that you can tell a lot from the frequency and all of that of the spark.
[/quote]
Had a 92′ 4dr. Honda Civic EX also. It had 300,000 miles or more on it and wouldn’t pass smog. I did a whole bunch of stuff to it and it also wouldn’t pass. The tune up included new spark plugs. In the end I gave up and dropped the car at dad’s and bought another used Honda civic. Dad, being retired thought he’d give it a shot. He changed the plugs again. Fixed some leaky hoses and it passed.
The new plugs were defective. Its rare. And it was the second time I had bought faulty plugs. They were NGK. Yes I opted for the cheapos. haha.
Check for spark even though you have new plugs. If one of the plugs is too clean, you may not be getting spark. Also pull off the distributor cap and use emery cloth or fine sand paper to sand down the needle as well as the points on the inner distributor.
I even tried using the ‘denatured alcohol’ trick, it brought down my HC to zero. The smog tech had a curious look to his face. My other numbers failed though. I passed the 4th test after a SECOND set of new plugs. I wouldn’t suggest alcohol either. Its bad for the rubber in the fuel lines and seals.
good luck on your next test!