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post #1 of (permalink) Old 02-20-2002, 10:59 AM Thread Starter
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Misfiring at idle

I noticed this weekend my 1.3 was missing at idle speed and determined the number 3 cylinder was not firing even though it is getting spark to the plug. I removed the plug and it was not fouled and there were no signs of oil in that cylinder. I put in new spark plugs and swapped the rotor cap and wires with another engine. It is still missing and there is no change in engine tone when the #3 wire is removed. This 1.3 doesn't smoke, leak, or use oil, cranks good, still accelerates normally for a stock carb and will run 75 mph even now, but that cylinder will not fire while idling and it sounds pitiful. It will even continue to run at idle speed without dying with only two plug wires on it. There is no play in the distributor shaft and adjusting the timing did not help. I haven't pulled the valve cover. Any of you mechanics know what this problem sounds like? A stuck or burnt valve maybe?

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post #2 of (permalink) Old 02-20-2002, 11:10 AM
 
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Re: Misfiring at idle

It sounds like you have a burnt valve, or maybe a tight valve, which will cause a burnt valve, or worse. You need to get a compression guage on it to verify, and compare it with the other cylinders. That will tell you the quickest what is going on.

Jim

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post #3 of (permalink) Old 02-22-2002, 10:14 AM
mike shannon
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Re: Misfiring at idle

get off your a$$ and put in that 1.6 16v i sold you. but do as the post above say and check the compression. then pull the valve cover off and back the valves off and try the compression again. i have seen one that the ex valve was just to tight and caught it in time. just readjusted it and it was fine. i have a 91 here at the house that has a bad exhaust valve on #3 also. it turned out to be burnt. i have to pull the head and get it redone. the compression on it was 130 for 1,2,4 and 70 on 3. if your compression checks out then go to the injector if it a f.i. mike

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