Valve Head Noise LOUD TAPPING

[batmmannn]

Hey Guys I know I am posting a lot please forgive me but I have all these Supras and that means all these problems. I have a video I made for you up on you tube, You guys Rock so let me know what you think this noise is OK?
The car is a black 87 N/A Auto No Mods about 170k on it. It started running sluggish and missing a bit when this noise started. I have driven it maybe 10 miles since this noise started. I have been told that it might be a rocker backing off or something broken in there. Thanks so Much!

http://www.youtube.com/watch?v=93hEYr-V4jQ

[907mge]

That could very well be rod knock or a valve problem. The one thing I do know is that is has no rockers since it is a Dual Overhead Cam Motor. Here is the valves and cams diagram....


http://www.cygnusx1.net/Supra/Librar...spx?F=1302&P=1

[batmmannn]

Could it be the adjustment has come loose? I hope I don't find a rock in there or something my ex through in the motor. Hmmm, Maybe the car jumped time and the valve is slapping out of time?

[supraflymkiii]

Doesn't sound like rod knock. There is also no adjusting to be done with the stock lifters. The only thing to adjust valve lash is with shims. It kind of sounds like an electrical arc. You should try and replace the plug wires, one might be cracked and arcing on to the head. Also I doubt that it jumped time I've never heard of it happening to anyone on these engines. To check timing set your crank to 0 deg btdc on compression stroke pull your camgear cover off and make sure both the stamped lines on the cam gears are pointing straight up. Then to make sure get a timing light and make sure your timing is at 10 deg btdc.

[batmmannn]

I have to do research just to keep up with your responses. If it is arcing I should be able to see it in the dark correct? I agree I don't think it would idle so well if it jumped time, It will take me some time to figure out the other parts you spoke of. You think that sound is an arc? Wow what a concept! I saw a post about lining up the cam gear. Now if I can figure out where that is on the engine. If I have let this car sit so long because of a bad plug wire I am going to cry.... Thanks so much!

[supraflymkiii]

to see the timing marks on the cam gears you take the panel off of the front of the engine that says 7m-ge. I actually just recently put a new engine in my jeep and it has coil on plug and its a little tricky to get on. So i put it on and thought it was on all 6 plugs so i started it up and it was idling shitty and had a miss and was making a loud arcing sound so i looked a little closer and realized the boot wasn't on the sixth sparkplug stuck it on and it ran perfect. As for seeing it in the dark I don't know if you would see it or not its worth a try.

[batmmannn]

Oh Ok yeah I know the cam gears now I was thinking of something else. Yeah, I did the timing belt on this car I can't remember how long before the problem started thats why I thought maybe it had jumped. It was running real rough, I think the plug wires I just found I bought back then but when I went to do the job I was discouraged because of the intake and how you have to remove it to get the plug wires run correctly. No way to feed those through I saw with the upper plenum on. That thing must be cake to take off though. I was thinking of a thread about the fuel cam sensor. Where is that on the car? ....? Thanks so much for your help! Hey wait a minute all you have to do is slip the rubber head off the distributer side of the plug wire and feed them through. I am a dumb ass.... like Popeye would say ...."Garshked!" lol

[turbonicsperformance]

its not just valve tap or lifters and your timing won't cause a noise just a rough idle or sluggish condition it really sounds like you broke a valve spring but only one since it is a very slow tick sound were you revving it when this noise first developed and does it become less apparent or more when you rev? also i dont think your ignition timing would cause this without ALOT of other signals (hard slow start, overheating, cracking pistons, and alot faster noise) but imho it is a broken valve spring you should pull the valve covers and check them its not that hard of a job just remove intake where it splits and take off the valve covers the wires can stay in and everything

basic rule is a noise at half engine speed is valve noise or cam noise
full engine speed is ignition sound "arcing" or rod/main detonation etc.

[batmmannn]

I will have to see if it gets less with high revs. Would this damage the cam all this slapping? Can the spring be replaced with the heads on? Thanks, Scott

[wstanek]

that's making quite the ruckus. lol =D anyways somthing is definitly wront in the valve train and also definitly not a rod knock.