Join Date: Sep 2008
Location: Fruitland Park,Florida
Need to pull opti back out to see if spline-ed shaft might have jumped time because of a worn female spline on cam gear. Go to shoebox site and make sure keyway on spline-ed shaft & female splines match up.
Next, you could have a worn timing set that jumped time because chain was too loose. I forgot to add in last post that rotor screws should always have locktite put on them and tightened down. Rotor could have come loose.
Check your car for codes using an obd 1 scanner or by shorting aldl terminals with paperclip. Shoebox site will have a diagram of aldl with terminal ID. Your 93 is only year 4th gen that paperclip works on. Look for a dtc 16, 36, 41, 42. The 1st 2 are opti codes. Last 2 are icm codes. None of them light the check engine light.
For detecting low & high resolution opti problems, an oscilloscope is only 100% way to test. With it, you can see if low & high res signals are proper square wave, don't drop out, or change waveform. MSD was having a lot of trouble with their opti, a few years ago. That is why I don't recommend them anymore.
You can buy a pc based opti for around $70 on Ebay, Amazon, etc. All lt1 owners should have one. Scope is good for testing any dc electrical system. On our cars, use it to test the pesky 30 or 50 hertz fuel enable system.
Last edited by cocobolo95; 06-25-2019 at 07:10 AM.