optispark, installation-finding TDC?
Thread Starter
7th Gear
Joined: Aug 2010
Posts: 7
Likes: 0
From: Downers Grove Il
optispark, installation-finding TDC?
I took out my optispark to switch it out. Then as I was moving the crank up to 12:00 I clicked the ignition too far. I adjusted the crank arrow to 12:00 then put the optispark in, but, it runs really bad. one of my buddies said i'm probably in on the exhaust phase. I need ideas to how to find TDC for the car then put the new optispark in so it runs smooth. Help?
Are there any other troubles I might run into?
Are there any other troubles I might run into?
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
IIRC
the Opti is indexed to the cam and can only be fitted in one position so you don't have to worry about finding TDC
Have you got the plug wires in correct order coming off the Opti?
http://www.pavementsucks.com/board/t...k-firing-order
the Opti is indexed to the cam and can only be fitted in one position so you don't have to worry about finding TDC
Have you got the plug wires in correct order coming off the Opti?
http://www.pavementsucks.com/board/t...k-firing-order
C3 Corvette Enthusiast
Joined: May 2008
Posts: 1,071
Likes: 3
When I did my rebuild, I replaced the Opti and waterpump. I had two wires switched (easy enough considering that running the spark plug wires is almost as difficult as replacing the Opti. Even though it meant eating crow, I went back and traced every wire and found the problem. I placed them back in the correct order and it ran well.
It's the little things that always come back to bite me.
It's the little things that always come back to bite me.
Thread Starter
7th Gear
Joined: Aug 2010
Posts: 7
Likes: 0
From: Downers Grove Il
finding TDC-opti installation
Well I went back and retraced all the plug wires and fuel filter. the car wants to start, but, when cranked over seems to choke out? could I be 180 degrees off on the crank and still slip in the opti notch? and be off? could I have bad injectors?
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
On 92-94 OPTI shaft is splined so finding TDC should not be an issue however, some folks have been able to install their opti out of time.
Do you have a quality OPTI....some of the CHEAP...make that many of the CHEAP EBAY OPTIS are DOA.
You mentioned checking the fuel filter. If you replaced it is the arrow pointing in direction of fuel flow, and what's your fuel pressure?
You also mention your injectors have you conducted a resistance check on them? Have you checked the injector fuses? Have you used a noid light to see if the ECM is firing the injectors?
Mike
Mike
Last edited by aboatguy; Aug 25, 2010 at 10:52 PM.
