94StinkinLincoln

well heres the short version, advanced timing, pinged, back it dow, thought i did, gun has advancement dial on it and was turned up, car ran real bad, shakes and runs like total crap and i hear air being pushed somewhere that doesnt seem normal. turned timing way down and still runs like crap.i did a compression check on all cylinders all but one read right at 180. the cyl. next to cyl. #1 read no pressure. i put my finger on the hole and could feel air moving in and out, but there was more air on cyl. #1 anyways i took the vc off and all was normal, we put oil ontop the cyl. via spark plug hole to see if compression would change, it didnt. so can anyone help me?

iceman89gt

damn it !!!! i told you that you needed to be sure that wasnt a advance gun. you may have gone too high with the timing and burnt the top out of that piston.

94StinkinLincoln

damn i was afriad of that...looks like ill be pulling it again[sm=headbang.gif]

1991LX5.0

wow didnt you just get that rebuilt?

iceman89gt

what was the maximum setting advance on the gun itself

67mustang302

Dang, that sucks. You either burnt a hole in the piston, or if they're cast(hypereutectic especially) it prolly fractured when it detonated. BTW, those dial advance guns don't work worth a crap with MSD boxes, they can't read the ignition signal correctly

94StinkinLincoln

the ignition is all stock, and that gun goes to like 60, i kno it wasnt all the way up, but it sounds like i may be screwed anyways. i reved it up listening to the engine and i heard a loud thump once, figured it detonated, but i figured the engine would be ok, guess i was wrong. i have SRP pistons, im not sure if they are forged

94StinkinLincoln

here is a link to stangnet where i started a thread. maby this will help me and maby others if they encounter a simular problem. im taking the head off tomorrow to have a look see, but i will adjust the rocker arm first too see if that is a possible problem.

my77stang

dude you would think you woulda heard it pinging BADLY if it got to the point where you nuked a piston

somehow i cant see that being thet problem *fingers crossed for your sake*

94StinkinLincoln

same thing i figure...but if its the ring...out comes engine...if its valve or head gasket, get head/valve worked or change gasket, no big deal. im learning so im not too pissy but i get agrivated when i cant drive it.