Continuing to struggle with Code 42 ??

[lt14life]

Hello All,

Ok I have a 1994 LT-1 Vette, Auto Trans, with 118,000 Miles & im still struggling with this Code 42. when I start the car it runs rough and then dies, then it will restart and after several minutes of driving it smoothes out and runs perfect, Here is a list of all the new parts, new MSD Opti-Spark, new Coil, new IAC, new ICM, new TPS, new Spark Plugs, new Spark Plug Wires,new Fuel Pump, new Pigtails for all of the above parts and the wiring looks good, I sent the P.C.M. out to be tested and it passed with no problems. The fuel pressure is at 40 PSI, At this point I really dont know what to troubleshoot next and im so frustrated because this has been going on for a few months now, im considering just dropping it off at the repair shop and see what they can figure out.

[ChuckG]

Maybe some food for thought:

1985 C4 Corvette SES Light - Sensors - Car Craft Magazine

[lt14life]

Originally Posted by ChuckG

Maybe some food for thought:

1985 C4 Corvette SES Light - Sensors - Car Craft Magazine

Thanks for the artical, it was very interesting. the repair was based on an 85-92 and he had installed his distributer incorrectly. I have a 94 with the Opti and its a keyed setup and can only be installed one way infact thats what crapped out first , the Opti so I went with the MSD and it ran great then the ICM went bad and I replaced it. So now I have the current problem and not sure which direction to take. Thanks again.

[ChuckG]

I thought the Opti started earlier.

[lt14life]

Originally Posted by lt14life

Hello All,

Ok I have a 1994 LT-1 Vette, Auto Trans, with 118,000 Miles & im still struggling with this Code 42. when I start the car it runs rough and then dies, then it will restart and after several minutes of driving it smoothes out and runs perfect, Here is a list of all the new parts, new MSD Opti-Spark, new Coil, new IAC, new ICM, new TPS, new Spark Plugs, new Spark Plug Wires,new Fuel Pump, new Pigtails for all of the above parts and the wiring looks good, I sent the P.C.M. out to be tested and it passed with no problems. The fuel pressure is at 40 PSI, At this point I really dont know what to troubleshoot next and im so frustrated because this has been going on for a few months now, im considering just dropping it off at the repair shop and see what they can figure out.

Well I decided to check for codes again today and I still have the 42 but I also have a DTC 24 & DTC 62, So im going to try and figure out what they are. The car runs like crap for about 10-15 minutes and then it smooths out and runs perfect.

[ChuckG]

You don't have a cold start injector, do you?

[lt14life]

Originally Posted by ChuckG

You don't have a cold start injector, do you?

What do you mean ? Bad injector ??

[ChuckG]

Early TPI set-ups had an injector that only came on at start, like a choke. It's called a Cold Start Injector. Had a switch and maybe a relay too.

Anyway, it was phased out when the designs got better, but I'm not sure what year.

I upgraded to Gen III from the Gen Is and I understand these do not need the cold start, but I still have it. This is why my engine revs to about 1500RPM on start and then settles down when the cold start injector cuts off about a minute in. It's annoying, but I haven't found a work-around yet.

[lt14life]

Originally Posted by ChuckG

Early TPI set-ups had an injector that only came on at start, like a choke. It's called a Cold Start Injector. Had a switch and maybe a relay too.

Anyway, it was phased out when the designs got better, but I'm not sure what year.

I upgraded to Gen III from the Gen Is and I understand these do not need the cold start, but I still have it. This is why my engine revs to about 1500RPM on start and then settles down when the cold start injector cuts off about a minute in. It's annoying, but I haven't found a work-around yet.

Oh Ok, No im pretty sure I dont have the cold start injector. Thanks.