popping sound under full throttle.

[dlazo80]

Check out the vid. each time you hear that popping sound the engine has surges of power. Tell me what you guys think. http://www.youtube.com/watch?v=SwgtfkwsIaE



2000 ranger xlt 3.0 140k miles, kn filter, air box mod.

 

[dlazo80]

Cant get the video to show in the thread.

 

[Transmarobirdeater]

That sounds like an intake valve that isnt seating. May be as simple as shiming a rocker arm on the bad cylinder. After I replaced my head gaskets I had a valve that was not completely seating. It would only back fire at higher rpms. The reason it wasnt seating was because I cleaned the carbon buildup off the back of the valve and it was bent a little. The valve kinda of wore up into the head a little so I stuck a .025 shim under the rocker and that allowed it to seat all the way. Compression test/Leakdown Test its worth doin.

 

[dlazo80]

Yeah good idea. I have a compression tester I can fiddle with next week. although im strapped for cash til the first. so replacing plugs and coil packs are going to have to wait, ill keep the forum updated. I will try and pull the plugs and see how they look. Ive heard if you pressurize the cyl with compressed air you should hear it hissing if there was a leak. the piston in question must be at tdc and listen for hisses through the oil fill for leaks in the rings, hiss in the tail pipe for an exhause valve, hiss in the throttle body if its an intake valve and hiss in the rad if its a head gasket issue. and you can use a compression tester hose to pressurize the cyl but you must remove the shrader valve from the tip so it can flow air. im going to play with this next week.