Larry Bob Can i have your email address pls

Really wanna get in touch with you.

Came here from my auto class to actually understand how it works. THEN you can go learn the more intricate systems and THEN learn how to diagnose them.

Thank you! I'm glad you liked the video

Same

no

They didn't have evap systems, just a vented tank

@@michaeljvan6117 the vented tanks to the atmosphere were no longer allowed by the epa sometime in the late sixties into the very early seventies, my question was pertaining to the systems before computer controlled emissions and after the vented to the air systems.

There was no purge valve, it was only charcoal canister. The vapours flow from the charcoal canister were almost uniform. The carburetor was tunned accordingly.

Vacuum operated valve

No, "Spark Knock" is a result of multiple flame-fronts colliding inside the combustion chamber. This would be caused by a second ignition source in the cylinder igniting the mixture in addition to the spark plug.

DIY Auto Homeschool alright thanks I’m gonna replace all my spark plugs and see if it makes a difference. Love the videos man!

@@NirvanaBoy300 What problem are you having and what kind of vehicle do you have? If you believe you're having Spark Knock, spark plugs are not usually the issue because true spark knock will happen when the plugs fire, but so does another ignition source in the chamber, causing the 2 opposing flame fronts to collide during combustion. Now, you can have spark knock, detonation or pre-ignition, and you kind of get to a point where these issues can overlap or be confused for one another. If your engine has a bunch of carbon deposits and buildup in the cylinders, they can act to basically increase the compression ratio of the cylinder, causing the pressure and temperature to rise above the fuel's ability to resist combustion just from heat alone (Octane Rating). That would be detonation or pre-ignition. That same carbon buildup can begin to heat up and the build up of excess heat on those points can reach a point that they will act as a secondary ignition source, creating that opposing flame-front that can cause spark knock.

DIY Auto Homeschool I drive a 2001 Lexus ES300 with 165k miles. I hear a rattling type noise under load. What are some options I have to fix this?

@@NirvanaBoy300 Before you do replace anything, just fill up your tank with premium fuel and drive for a bit. See if it changes. If you're not using 91 octane, you really need to be. If you don't have 91, you might skate by with 87.

Maybe the fuel cap is not closed proprely or there is a hole in the pipe.

@@ilirhalili4712 nope no hole and cap is properly on and closed tight

@@dustinbergeron7508 it’s the p0455 is “major leak detected” so probably from the fuel tank, you said you changed the valve but look if there is any hole in the canister. It’s plastic so it can be damaged easily.

@@ilirhalili4712 changed the purge valve, canister, pressure sensor, fuel cap, filler neck, and the vent valve

@@dustinbergeron7508 shiieet, well, last thing to do is to clear the code and hope for it to never show again. I had some problems with my sister’s Peugeot 208 with the adblue. The light turned on and I turned if off, then it came back and disappeared by it self. At that point, just drive with it if you can without any risk.

The vent is only open when the engine is drawing from the canister

How you deleting everything given me an idea

Charcoal Canister is probably restricted. Seen a number of them full of water. That code will set if there is any restriction in the system, check the lines and the vent, but your issue is likely the Canister.