Spark Plug Problems

andy669 · 07-04-2001, 12:37 PM

Hey Juice, ya ever have a stock 5 oh on an engine dyno? Oh wait, of course you have, youre a big guy. Well what I've seen from my experiences on the engine dyno tell me that all of the cylinders except #8 all run very close to each other. The egt on #8 has been about 100-150 degress cooler. Thats probably worth 3-4 horsepower on a stock engine. Its amazing how even the egt's on these engines come up. Nothing like a carbed engine where they are all over the place. I'll agree with you on the plug gap, there is no performance gain when you gap over 40. I'll also disagree (somewhat) with Jimberg on replacing o2 sensors. If you know that they are not the problem, (i.e. codes) I wouldnt replace them. They have the capability to clean themselves up. (so to speak) I have watched this happen on my pms. Also if someone is having problems that they cant figure out and they are spending $50 here and $100 there, another $100 for new o2's might be alot. but if someone has the extra $100 to spend when troubleshooting, replacing them is a good idea!

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07-04-2001, 12:37 PM	#17
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	Hey Juice, ya ever have a stock 5 oh on an engine dyno? Oh wait, of course you have, youre a big guy. Well what I've seen from my experiences on the engine dyno tell me that all of the cylinders except #8 all run very close to each other. The egt on #8 has been about 100-150 degress cooler. Thats probably worth 3-4 horsepower on a stock engine. Its amazing how even the egt's on these engines come up. Nothing like a carbed engine where they are all over the place. I'll agree with you on the plug gap, there is no performance gain when you gap over 40. I'll also disagree (somewhat) with Jimberg on replacing o2 sensors. If you know that they are not the problem, (i.e. codes) I wouldnt replace them. They have the capability to clean themselves up. (so to speak) I have watched this happen on my pms. Also if someone is having problems that they cant figure out and they are spending $50 here and $100 there, another $100 for new o2's might be alot. but if someone has the extra $100 to spend when troubleshooting, replacing them is a good idea!