i just pulled a 355 turbo motor out of 97 trans am with an auto and put it in my 95 trans am with a 6-spd

after i hooked everything up it would not start

it did not have any fuel pressure so i ran my own wires to the pump and got it working but now the spark plugs arn't sparking

what would make the fuel pump not work and keep the plugs from geting power?

thanks
robbie

 

You're running into complicatoins with the computer and pressure sensors.

If the rail pressure isn't sufficient, the computer wont signal the ignition system to fire.

You could probably get most of your info from the LT1 section using search.

 

it was running 44psi fuel pressure

anything in preticular i should check?

thanks
robbie

 

The ECM has no idea what fuel pressure is nor does it care. There isnt any pressure sensor on the car.

For whatever reason, your ECM isnt putting out a fuel pump prime signal nor a spark signal. I would start checking to make sure you got all the grounds back in place. My first thoughts would be to start with all the stuff on the drivers side head and coil/ICM.

Do you have a data logger? See if you can get ECM communications with it with key on.

 

Ditto... there is no fuel pressure sensor on an LT1.

Check the Opti harness. If the PCM does not see the low res pulse from the Opti, it shuts down the fuel system, including the pump and injectors. That would also explain the absence of spark.

 

i checked the opti and noticed i missed the two vaccumn lines on the drivers side of the opti but still no go

atljar, i have a lt1 edit will that do what you want?

any other suggestions?

thanks
robbie

 

Try to hook up and use LT1 Edit and see if can conect to the cars computer.

It sounds like a bad ground to me.
Did you check all the fuses?

 

i checked all the fuses related to the ignition and PCM

i will try the lt1 edit

thanks
robbie

 

The OBD-I version of LT1_Edit includes "pcmcomm".... that's the scan software.

 

mines for OBD2 the motor i put in the car is out of a 97 trans am

could that cause any problems putting an obd2 motor in an obd1 car?

thanks
robbie

 

I'm in the same situation, 96 motor in a 93, no spark and no fuel. Tomorrow I'll probably pull apart the opti and see if that's the culprit.

 

get back with me if you figure it out

 

What PCM are you using?

 

If your not using the 96 opti harness, your not making connection. The 95 and up are longer, the 93 will still fit put not make connection.

Mike

 

the OBD2 pcm on the 96 motor

thaks
robbie