ok for a long time i never noticed it after changing pumps and thermostats and sensors and such but its back...the pinging....sounds like there are rocks in my cylinders.

i thought it was the chts, then the aav and the vaccum system but still.
i'm down to ignition and EGR circuit.

first off what do you guys think about the pinging?

seccondly, what kind of MSD ignition components will work on a car like this?

 

Whoa, you say rocks? I think it's time to whip out the compression testor. What I'd be worried about now is how severe the pinging is, because if it's very severe, and you say it seems like there are rocks in the cylinders...I'd be inclined to wonder if you've gone real lean, started detonating bad, and have piston damage because of it. A compression test would be a good start. Also try to examine the spark plugs...they might show a good indication if you've been leaning out.

S

 

not like a whole quarry of rocks just a mild pinging, underload going up a hill but instead of being warmed up like it used to be it does it at any temp.

compressions tests were at about where they should be, did that a few months ago to check other things out after doing all that work.

on the straight and level it just goes, steady even.

i forgot about fuel system too, i replaced the filter a year ago, time to change it again but it didnt help back then, been thinkin about a new pump if i take the rear seats out to get them re-upholstered

 

pistond damage?? whoah, i better beware of any pinging on mine as well

 

did you check your timing?

 

yep, it doesent matter....well unless you go too far advanced or retarded (heh)

 

it's not just valve train noise is it?

 

nope, i figure if it were damage to the pistons it would do it no matter what

 

by that i meant are your valve clearances out too much which is making your rockers tap on the top of the valve stem

 

they shouldnt be, the heads were rebulit umm...15,000 ago now...not that long in terms of wearing out

 

I was going to suggest water injection for carbon build up in the combustion chamber, but if the head was recently redone I don't think it'd be carbon

 

Here's an off-the-wall guess, but it could be your axles. Since having mine replaced a couple of months ago my pinging has gone away.

 

Mine Does that it sounds like there is one rock in there , Like a clicking noise , I got a tuneup and New sparkplugs , And a compression test for 450 total at midas , And i dont hear it any more , Whew once i got this done my car felt almost like a tuner! a nice one.

 

no i know what that sounds like and its a different sound, new plugs hmm...i put new plugs in it before the timing belt broke, the wires havent ever been changed, so i guess i'll go for some wires, and plugs are cheap so i'll change them at the same time

 

Another thing to try is a higher grade fuel. Might be an out there chance, but low octane can cause a little detonation in some cars even when they don't call for it in the owner's manual. My 300zx did that under load on 87 octane and 89 and up fixed it.