installed a used engine in a 2006 chevy optra manual transmission and the engine light keeps coming on


Asked by ajjace Feb 18, 2013 at 12:12 AM about the 2006 Chevrolet Optra

Question type: Maintenance & Repair

my engine light comes on, sometimes it flashing, sometimes it a solid light. the diagnostic reading says
misfire on 2 and 4 cylinder, but it not. all the connections are in place but the engine light has not stayed
off since the engine was replaced. It also seem like i am burning more fuel when the engine light comes
on. can you help please?

6 Answers


Replace the coil packs or pack and wired and plugs or boots it will fix it your cats will start glowing and stop up if u don't do it early and save them and fix your problem

1 people found this helpful.

i have changed the coil, plugs and wires, and the light still keeps coming on and flashing. what else can it be? does the computer need to be reprogrammed?

2 people found this helpful.

Hi where did you find an engine for an Optra? Can you please help? In need of a Chevrolet Optra 2006 engine ASAP. Thanks

3 people found this helpful.

swap wires 1 and 4 and 2 and 3 that might solve it there is what is called a waist spark if you mix the wires the car will still run but missfire under load cause waist spark is week. cheers

2 people found this helpful.

scratch that. swap the wires and check if the miss moves to the other cylinders if it does your coils are gone.

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