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Engine, Transmission, Drive Line, Etc
Engine running crummy
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<blockquote data-quote="jpaz" data-source="post: 352954" data-attributes="member: 2971"><p>Thanks for the replies guys!</p><p></p><p>I think I may have a blown power valve from what you guys are saying. No external leaking from carburetor. I have about 12-13 inches of vacuum at idle, so I have a 6.0 power valve. Should be right for my application. I have checked the level in the site glass and it is good while running and after I shut it off. I only noticed that the gas had leaked down after it sits overnight. I never noticed this before and didn’t think it should do this. My carb is only about 2 years old.</p><p></p><p>I just put new Autolite 25 plugs in and gaped them to .035. That’s what the engine builder installed, but I did notice that they didn’t gap them to .035, was more like .042. But that’s not the problem. I had checked the heat signs on the plugs before this started happening and they looked good. Timing marks on the ground strap looked good as well as the heat range also looked good.</p><p></p><p>As for the timing being so advanced, this must have just happened somehow. I did not drive it very far after I heard it pinging, I knew something wasn’t right so I got it right back home. Drove it for about 15 miles or so and babied it back home. I reset the timing to where it was. My engine is far from stock, so trying to start the timing at 10* BTC is not nearly enough. It has always run good around the 14-16 degree initial mark. I know to plug all the vacuum lines and how to set timing, but I guess I really don’t know what my total was. I never checked it, but it was really running great with no pinging at all. Also, my distributor is recurved. After I reset the timing I didn’t hear anymore pinging, but the engine was sputtering and popping so much that I really couldn’t give it to much gas. I didn’t even drive it very far, less than a mile and just brought it back home.</p><p></p><p>I just put in fresh gas the other day, so it’s not that. I actually thought at first it was the crappy winter blend gasoline, so I added some octane booster to it with the same results. I don’t think it’s the gas.</p><p></p><p>I started checking into the ignition first but I think I have eliminated that. Next thing to check is carb. I’m trying to go thru one thing at a time. Today I will pull the carb bowls off and see what’s going on inside. Can you tell if the power valve is bad by just looking at it?</p><p></p><p>Thanks again guys for helping me out with this!</p></blockquote><p></p>
[QUOTE="jpaz, post: 352954, member: 2971"] Thanks for the replies guys! I think I may have a blown power valve from what you guys are saying. No external leaking from carburetor. I have about 12-13 inches of vacuum at idle, so I have a 6.0 power valve. Should be right for my application. I have checked the level in the site glass and it is good while running and after I shut it off. I only noticed that the gas had leaked down after it sits overnight. I never noticed this before and didn’t think it should do this. My carb is only about 2 years old. I just put new Autolite 25 plugs in and gaped them to .035. That’s what the engine builder installed, but I did notice that they didn’t gap them to .035, was more like .042. But that’s not the problem. I had checked the heat signs on the plugs before this started happening and they looked good. Timing marks on the ground strap looked good as well as the heat range also looked good. As for the timing being so advanced, this must have just happened somehow. I did not drive it very far after I heard it pinging, I knew something wasn’t right so I got it right back home. Drove it for about 15 miles or so and babied it back home. I reset the timing to where it was. My engine is far from stock, so trying to start the timing at 10* BTC is not nearly enough. It has always run good around the 14-16 degree initial mark. I know to plug all the vacuum lines and how to set timing, but I guess I really don’t know what my total was. I never checked it, but it was really running great with no pinging at all. Also, my distributor is recurved. After I reset the timing I didn’t hear anymore pinging, but the engine was sputtering and popping so much that I really couldn’t give it to much gas. I didn’t even drive it very far, less than a mile and just brought it back home. I just put in fresh gas the other day, so it’s not that. I actually thought at first it was the crappy winter blend gasoline, so I added some octane booster to it with the same results. I don’t think it’s the gas. I started checking into the ignition first but I think I have eliminated that. Next thing to check is carb. I’m trying to go thru one thing at a time. Today I will pull the carb bowls off and see what’s going on inside. Can you tell if the power valve is bad by just looking at it? Thanks again guys for helping me out with this! [/QUOTE]
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