did a tuneup on my 89 iroc, and dummy me got the wirings crossed. can anyone tell me the firing order on the block as it relates to the distriburtor cap? hate to by a service manual, so i ask anyone here that knows. thanks

Firing is 18436572.
Drivers side is your odd cylinder with #1 of course at the front
Passenger side is even side

Unhook the power to your distributor, remove #1 spark plug and have some one crank over while you hold your finger ove rthe spark plug hole. when air pressure blows pas tyour finger that is #1 tdc.

Remove dist cap and see where your rotor is pointing. That spot in relation to the cap will be #1 then teh rest follow around in a clockwise pattern if looking at the distributor form the front of the engine.

Good Luck!!!

5.0L and 5.7L (VIN 8) Engines - Engine firing order: 1-8-4-3-6-5-7-2- Distributor Rotation: Clockwise

thanks for the diagram. it was driving me nuts. after thinking about it, i figured it out before my reply posts. 2 and 4 were crossed. switched em, and the iroc runs great. thanks again

ok so i did all the stuff everyone said and i have the same problem stated at the top of the page and i still have the same problem. it was fine untill i changed the cap and rotor out and i have checked the firing order timing everything i can think of... what do i do please tell me if you have an idea. i have done the tdc and everything. i just dont understand it was just a normal tune up and after i finished she didnt run worth a flip.

check for spark and see if your injectors are spitting if not more likely your module took a sh***
s either change the module or the whole distributor