What is Happening to MY Mustang!!

What has to happen is we have to be able to develop equal pressure in all cylinders. In this case, this is an 8-cylinder, but what we're going to do is show you what you do with one cylinder, and then you can go through and compare the pressures that each cylinder generates while cranking to see if they're equal. It's a pretty simple test, but one thing we have to remember, above all else, if the engine can't build equal pressure, it may run, but it's never going to run right. This is one of the basic tests that have to be done when we're chasing a drivability issue or an engine that doesn't run well. One of the first things that we're going to do is we are going to disable the ignition, because what we want to do is be able to crank it over without the engine stalling. This is what's called a cranking compression test. So what we're going to do is... Let me disconnect last time. I forgot. Oh, you know what? We don't have to do that because I've got a pump stall. This is another way that we can do it. First things first, we're going to remove one spark plug. This happens to be the number one cylinder on Ford engines. However... Not on Chevy. Actually, Ford is the only one that it's not. Your wire came apart. That's what happens when you buy plug wires on Amazon. Yeah, parts quality is a thing. All right, so we're going to grab our extension. Can I take that plug out? Me? Yeah, you. You just happen to be right there. It's kind of breaking it. There you go. Always be careful because sometimes you end up smacking things, so look what's on the other side of the way you're turning. Yeah, make sure it's not your nose. Yeah, it's not your nose or something like that because I guess I've done that. And if you're super coolotie and you graduate on time, Charlie might give you the car. What we say about making promises you can't keep. All right, thank you, sir. You just go ahead and put that on the back. This is his baby. He's not giving up his baby. All right, so this is what's called a pump stall. And what this is, this is just for testing. And it's going to supply, instead of going through the ignition switch, we use this to operate the stall. This way the ignition switch is not on. We don't have to mess with any wiring on the distributor to stop spark. And we are going to go from, let's see, Charlie got the right one. Okay, so here's the positive. One of the things that you'll learn over time, never trust battery cable colors to tell you which is positive. Always look at the battery. Plus is positive, negative is negative is the dash. All right, so all we did is just bypass the whole ignition system. And now we can control the starter with that switch. So we got two potentially interested in auto, right? One welder. All right, we've got a welding demo too for you. All right, so here's our compression tester set. This is pretty universal. All right, it works on a whole bunch of different gasoline fuel vehicles. And we have adapters for all sorts of different spark plug sizes. We have to pick the appropriate adapter. And that's real easy to do. Okay, we take our spark plug and we match the thread sizes. Okay, we want to make sure that the threads line up. You see how they lay into each other? Okay, and we also want to make sure that the tester is not longer than the spark plug. Why is that? Because what can happen if it will stick too far down inside? And when the piston comes up, it could hit. And we could potentially do some pretty nasty damage. It's your turn. All right, go ahead and thread that in that first spark plug hole. The thing about spark plug holes is sometimes the angle and where they're at makes them a little weird trying to get stuff started in them. Sometimes impossible. Hey, Charlie. Hey. How's it going? Good. How are you doing? Good. Glad you made it. Yeah. Is it supposed to go all the way? Yeah. It's a very short thread, so it doesn't go very far. Oh, you guys are doing a compression test? At least a one-cylinder compression test. Yeah, get that finished up. It's caught now. Yeah, you start it to the right. Yeah, just hand tight. Just like that. Good enough? All right. If the pressure gets too high, it can damage head bolts and gaskets. So a lot of times if you do anything that builds too much compression. This just hooks on here like so. Instead of having head bolts, you have studs. All right, and what we're going to do is we're going to crank this over using this button. And what we're looking for, it's kind of hard to tell with only doing one plug with all the other spark plugs in, but we're looking for about four or five compression strokes. And again, with skill, you can hear it with time. But more importantly, whatever we do on one cylinder, we want to do equally on the other cylinders. So usually what I do is I'll count in my head to five. 1,000, 2,000, 3,000, 4,000, 5,000. All right, so your turn. Go ahead. That should not happen. All right, let's think that over. All right, do it again. All right, so what happened is we end up with 120, which normally we would look up a spec and compare it to the spec to see where we're at. I know through experience that 120 for an engine like this is perfectly acceptable. But more so than not, we would test all of the cylinders and make sure that they're within a certain percentage, usually about 10% from each other. If we got 10%, then we're in good shape. All right, so that's how we would do a compression test. Normally we would do all eight cylinders, but just for intensive purposes, this is what we'd like to show you. You guys have any questions? How many of the tools? That's it. How many of the tools? Now, the thing is, the tools to do this, this is inexpensive. This is a Harbor Freight piece at $15, which is good for a lot of different uses. You can buy a compression test with the adapters. Again, a Harbor Freight piece for probably $25, $30. When you start talking about tools, tools can get very expensive, but in the beginning you don't need to buy the expensive tools. You buy the tools that you can afford, and as you start making money, then you start replacing those inexpensive tools with better quality tools as you see fit. Because, yeah, tools can be very, very expensive. All right, any questions, comments, concerns? So why exactly did that, start making that kind of noise? Because what was happening is through this thortisolenoid, with this engaged, it applies power on this pin, and with this wire hooked up, it powers up the ignition system. Okay. And that's only for during cranking, because back when this engine was new and factory, it had a points ignition, and it needed extra voltage while cranking, so it routed it through there. Okay. Sometimes you run into that, sometimes you don't. Okay. It still runs through there, but it doesn't really need it on this one, because it's got an aftermarket ignition system. It's got high-falutin' stuff in it. Yeah. All right. On to the next station. All right. Thank you, Mr. Cozzolino. No problem.