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I tend to think it’s not fuel or spark related. It’s not necessarily 3 seconds every time. One of the times it sounded good for a bit longer with the throttle pressed a bit. But when I tried to open the throttle more, the engine died with a loud screech.
Is there any chance the cylinders just don’t have enough oil for the new piston rings?
That’s a fair analysis I suppose. I could start looking. However, I took out the piston and all other components connecting to the crankshaft look like like they’re in great condition. The valves on cylinder 4 (the one with the damaged piston) look a little discolored so I may replace them too. The block and all other components appear to be in good shape. Isn’t it possible that this is salvageable?
Thanks for your help. After some research, I found that it was a blown head gasket between two cylinders. I’ve spent the day getting to the head gasket and it confirmed my analysis. Unfortunately, when I got the cylinder head off, I noticed damage to the piston. There was nos debris left behind, so I’m assuming this has been the case for the previous owners as well. Judging from this picture, will the piston need to be replaced?
That’s a good thought. I did replace the spark plugs back in July so it doesn’t seem all that likely that there’s an issue there. I took them out a few months back to check the gap and nothing seems out of the ordinary.
I’ll try your suggestion with taking one of the plugs out. There isn’t any problem present when the car is idling so I’ll need to drive it around. Can it cause any issues to drive the car with one plug removed?
I appreciate the reply. Those are excellent suggestions. I have checked the codes pretty religiously throughout the time the engine has been knocking. The only code I’ve received was a misfire code but that went away relatively quickly.
It should also be noted that when I bought the car used, the previous owners tried to glue a cracked radiator together which caused a pretty bad overheat. That’s what made me suspect a bearing or head gasket. I’ve been thinking about doing a compression test to hopefully eliminate the head gasket scenario. I’ll look into the faulty lifter or push rod.