93 vette no start
Thread Starter
Racer
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
93 vette no start
I have replaced the optic spark ,coil,coil mod,and emc.I still have a no spark.I have seen a after market ignition on some lt-1 race cars.Does any one here know who makes them and their contact number?
I raced this car in july at beech bend.Unloaded back home here and it died .
Thanks guys
I raced this car in july at beech bend.Unloaded back home here and it died .
Thanks guys
Melting Slicks
Joined: Jul 2005
Posts: 2,649
Likes: 863
Just my $0.02, but stick with the basics. Do you have voltage to the opti, do you have some kind of pulsed power to the low voltage side of the coil. Do you have a questionable coil ground ??? If those are OK - do you have spark coming out of the coil, and getting "lost" after it heads to the Opti ???
While the opti is a known problem on the LT1/LT4 motors, if all else fails go back to the basics. The coil still works like any other ignition coil, killing the current through the coil cllapses the magnetic field and creates the spark.
Check the FSM and see what terminal on the connector that goes to the opti is V+, verify that you have power, and if so - try to back probe the low res and high res connectors with a digital meter to see if there is some kind of varying voltage signal on those leads. Yeas ago - I found out that if both the low res and high res pickups are not producing any output you won't get any Check Engine light - the ECM relies on one of them working...
GOOD LUCK !!!
While the opti is a known problem on the LT1/LT4 motors, if all else fails go back to the basics. The coil still works like any other ignition coil, killing the current through the coil cllapses the magnetic field and creates the spark.
Check the FSM and see what terminal on the connector that goes to the opti is V+, verify that you have power, and if so - try to back probe the low res and high res connectors with a digital meter to see if there is some kind of varying voltage signal on those leads. Yeas ago - I found out that if both the low res and high res pickups are not producing any output you won't get any Check Engine light - the ECM relies on one of them working...
GOOD LUCK !!!
Burning Brakes
Joined: Jun 2003
Posts: 1,079
Likes: 1
From: Niagara Falls ON
Any codes? If you don't have spark coming off of the coil then it is either the coil or the Ignition Control Module. If you are getting codes then it it probably the module. A friend of mine had a similar problem with his LT1.
Thread Starter
Racer
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
It runs
We replaced all the parts again ,with the orginal parts that came on the car in 2005.It started up.I hooked the MSD box up and it blew every thing again.I took all the new parts and got new ones.I put them on the car minus the MSD box and it runs.I guess the box was the problem,that started every thing.
Thanks for the help I received.I have a new MSD box,I will put it on Friday.
Thanks for the help I received.I have a new MSD box,I will put it on Friday.
