Spark Knock

[TurboTurismo]

Hey all..Everyone here has always been very helpfull

Have a question regarding my 84 Turismo.I did a full change over to TBI from a 90 Omni.Runs great!!!.....Weird thing is when I start it up- in the morning or after say 2 hrs of not driving after a minute or so the enging sounds like it devolps a knock that only goes away once warm then I dont hear it at all...
anyone know if maybe the sbec computer retard the timing during warm up?......I have it set to 15 for a little extra take off power since the tbi's are doggish off the get go

any help would be great

[DaytonaTurbo87]

Are you running 15* on 87 octane? I wouldn't, to be on the safe side, back it down to 12 and see if the problem persists.

[TurboTurismo]

yes lately I have been running cheapo gas at 15 deg.....would that cause the racket Im hearing.I noticed today that it does go away after 5 minutes of driving .BUT it still is there just not as noticable

Robb

[Rampage1967]

Probably piston pin knock, they revised the computers to cut down on that. My K car clatters like a diesel cold & runs fine. sounds like the same noise pattern & yes more initial makes it rattle worse.

[TurboTurismo]

any other ideas? Better gas? ,Oil , as in mobile 1, change from bosch plus 2's to champions?......I run a accel coil..should the gap on the plugs be set at 35 still? and what other sbec's would be compatible with 90 omni sbec setup 90 thru 94 sbec?

[TurboTurismo]

Ok I found my sound......Its only there when started...About 1 minute after its started it starts to clack behinf the valve cover.....as it warms or I drive it ..it goes away HELP please

[Cooter]

what's your oil presure at?? could it be a lifter??

[TurboTurismo]

nevermind this post.Im very sure its the flywheel craked. DOH