From buick 455 major problems with my 2002 firebird trans am

[Buick455]

HI Guy's and Dolls , I have a now start situation with my Trans Am .

I drove the car into my shop after I completed my work car will not start.

The Fuel Pressure is 55 lbs , but no spark from the coil.

Here is what was done to car: front struts, long tube headers , plugs and ignition wires , BMR Torque tube conversion, 3.90 gear change with true posi unit, BMR stabilizer bars in rear , line lock control .

The Front upstream o2 sensors are in the headers , the rear two are wired in and grounded until I complete the exhaust.

If anyone can help with this problem It will be well appreciated :

Thanks Buick 455

[SMWS6TA]

sounds like the coil harness is unplugged.

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sounds like the coil harness is unplugged.

[pajeff02]

Agree - something not plugged in, a missing or broken ground, or even a damaged section of harness would be my guess. Go over your work areas and carefully visually inspect everything. When you say you "grounded" the rear O2 senders, they do have a power feed to both the heater circuit and the sensor. You may have blown a fuse or popped something in the PCM... better to simply leave them unplugged and let the SES light come on until you can get them tuned out. Also, on your electrical connections, it is not unheard of for a pin to get bent in a connector - unplug your coil harnesses and inspect the pins in the connectors. Final thought - when you installed your ignition wires, did you hear/feel two "clicks" at each coil pack and one "click" at each plug?

[SMWS6TA]

when you say no start does it turn over at all but no fire or it doesn't turn over?

the later could be bad grounds.

[Buick455]

sounds like the coil harness is unplugged.

- - - Updated - - -

sounds like the coil harness is unplugged.

THANK YOU FOR YOUR RESPONSE, Here is what happened , when removing the starter to install the headers at the time I did not no that the Crankshaft Sensor is right behind the starter. I accidently pulled the wiring plug apart and broke the circuit.

this is my first LS1 and I can see it is going to be a learning curve.

Give warning to others if you remove the starter from your LS1 be very careful of the Crankshaft Sensor Wiring behind the starter solenoid.


Thanks again for your response ,I hope this will help others.

Buick 455

[pajeff02]

Glad you got her fixed.

[Buick455]

Hi From Buick 455,
Thank You for Responding, I didn't know the Crankshaft Sensor is right behind the starter . I accidently pulled the wiring out of the plug harness, and broke the circuit. I replaced the sensor and was able to get the plug harness from Advance Auto Parts and sensor , and rewired the harness. A warning to others be very careful if you take the starter out of your LS1 , the harness and starter solenoid is very ,very close the harness for the Crankshaft sensor.

Thank You Again, Buick455

[SMWS6TA]

Glad you got it fixed....