kgrant

my t/a will not start when it warms up i have replaced the opti and rewired the engine harness if any one can help me please

pro94lt

have you scanned it?

LT1

iTrader: (1)

What did you rewire and why did you rewire on the engine harness?

Have you checked your ICM if its failing? Lots of people have issues with them since its mounted on the front of the head and get heat soaked.

jester1614

iTrader: (13)

yeah i would lean towards icm or coil. if you have a friend with an lt1 car ask them to borrow their coil and icm. if it does end up being your coil go get yourself a msd coil. they are like 10 bucks more than a stock aftermarket replacement

kgrant

when I got the car the trans was out I had to rebuild it and the harness had alot of broken wires but when i was finish I did a contiuity test on all the wires i do have a msd blaster coil but it will be tomorrow before i can get it thanks

kgrant

And I have put spacers in the coil bracket And i am also having problem hooking up my scan tool i have no power at the scan port

RogueLT1

iTrader: (2)

does it run rough when it warms up too?

l 95 Trans Am l

iTrader: (5)

Does it shut off when its hot? My TA did the same thing when it was hot, it would cut out and shut off and not restart until cool. My opti plug was corroded and broke.

LT1

iTrader: (1)

No power to the scan tool might be a blown courtesy fuse or the cigarettes liter fuse.

kgrant

the code got was p1351 ignition coil control high voltage i also put the msd coil its still running like crap do I need to relpace the icm

kgrant

I also have a msd digital 6 plus box is there a way to bypass the factory controler

MattSapp95_T/A

iTrader: (35)

You can unplug the MSD box and hook it up stock if they used an adapter harness...

I would think it could be the coil though....

transam5.7lt1

iTrader: (18)

Remove ignition module and take it to your nearest Advance Auto, they have a module tester for it.

kgrant

I know the msd coil is good I took it off my other car and how do i hook the msd box

jester1614

iTrader: (13)

you either have to splice into the wires going to the coil or purchase a direct fit harness from msd

idformula

X2 on testing the ICM, have them test it about 6-7 times so it gets warm, they seem to like to fail when their hot, and work when their cold.

kgrant

thin the icm must be bad it runs fine then it is cold and runs like crap when it gets warm

RogueLT1

iTrader: (2)

possibly a stupid idea, but check your fuel pressure when it gets warmed up.