now what's wrong?

[heavy d]

I replaced my spark plugs after over 100,000 miles plus, now I have a kinda rough idle and my check engine light is flashing, and sometimes it stays on for a while! I took my time didn't damage anything and everything is plugged up correctly! Please help?

 

[drakon543]

Well since it shows you only have 1 post im assuming your new to the site and dont have any other threads relating to this. Can you please post your year make model, also post the specific plugs you used and any other parts you may have replaced. Its common for new members to accidentally post in the wrong year section so any added information will help us help you.

 

[heavy d]

I am sorry you are right! I have a 2005 chevy Tahoe with a 5.3 l vortex engine! I installed 8 autolite plugs and now I have a slightlyrough idle!

 

[Donnie Yukonie]

Welcome to TYF, I moved your thread to the correct location, Just as a FYI remember to select the correct year of threads before posting and members can better help you in the future!

As for your issue make sure to re-check the plugs to make sure all of them are popped in. it should make and audible click when they are set in. also why did you just replace the plugs? why not the wires as well? or cap and rotor? Just curious

 

[SLCHOE]

Flashing CEL means you have an active misfire and prolonged driving could cause Catalytic Converter failure. Flashing CEL also means there are active DTC's. What codes do you have?

Could be something as simple as a coil or wire. Could mean much worse. Post up your codes.

 

[heavy d]

Welcome to TYF, I moved your thread to the correct location, Just as a FYI remember to select the correct year of threads before posting and members can better help you in the future!

As for your issue make sure to re-check the plugs to make sure all of them are popped in. it should make and audible click when they are set in. also why did you just replace the plugs? why not the wires as well? or cap and rotor? Just curious

 

[heavy d]

Thanks, I will recheck everything tomorrow.

 

[Chizzychase]

Check The gap in your Spark plugs. Any auto parts store will have a gap tool and ask them about how to do it and they will tell you how to do it as well as what the gap should be for your motor. I did mine and the gap needs to be about .040 but as mentioned above double check that all the wires are completely plugged into both the coil and spark plug.

 

[heavy d]

Check The gap in your Spark plugs. Any auto parts store will have a gap tool and ask them about how to do it and they will tell you how to do it as well as what the gap should be for your motor. I did mine and the gap needs to be about .040 but as mentioned above double check that all the wires are completely plugged into both the coil and spark plug.

 

[heavy d]

Thank you! I will pull the plugs back out check the gap and reinstall them.