need help with lt1 tune up

[corvette66]

How would you guys go about tune'n up an LT1? it's in a 94 camaro z28 6 speed. The plug wires go to the front of the motor somewhere (electronic ignition moduel?????) , you know what i mean, there is no room in there to even squeeze in a screwdriver. unlike on a 90 vettes where you have full access. also looks like there is no distributor. I know nothing about these engines. Anything I can do to adjust the timing or anything? it just runs like its out of time a little bit. Otherwise it runs great, but something is just a little off somewhere.
what would you do?

thanx

 

[JimBobC4]

Do a search in this forum for Optispark. Thats the name of the ignition system on your LT1. The replacement is very similar on a Camaro but not exactly the same.

Also the ECM controls all the timing etc on this engine.

try www.z28.com for detailed replacement procedures.

 

[JAKE]

You could send your PCM to Bryan at PCMFORLESS (PCMFORLESS.COM) to have it re-programmed. He'll tweak the timing a fuel tables, etc.

I had him do one for my bone stock 96 LT1 and the mod improvements were instantly noticable.

Other than re-programming or buying and installing a new OptiSpark that has provisions for altering the ignition timing, it's not adjustable.

Jake

 

[Louis Bartay]

If you replace the plug wires, be carefull not to pull on them TOO hard. A bad plug wire will kill a opti-spark. Plugs and wires will be installed a little easier from the under side. I did this at 60,000 miles and now again at 140,000 miles, I paid a GM dealer to replace the opti, plugs, wires and water pump all at the same time. My wifes LT1 TA runs much better now. And I did not have to waste a whole day to do this. The GM opti spark is a POS. Make sure you have a good vacuum line on the opti so it vents.