Persistent Misfire cylinder 3

[Nap73]

What’s up guys

Need some help here

About 2 months ago I had a misfire in cylinder 3 with a flashing check engine light

I replaced the ignition coil and it immediately fixed the issue. I then went ahead and changed all the plugs and wires.

Now the 2 days ago about 45 min into an hour drive and I get another cylinder 3 misfire code P0353 solid check engine light and 2 pending codes P0303 & P0353. The mechanic cleared the codes and I went about my business.

Then yesterday I’m taking another hour plus drive and I get a flashing check engine light that stops about 3 mins after it starts. And I have 2 new pending codes P0303 & P0353. Light goes off and never comes back on. I clear the pending codes

I go to the mechanic today and he moves the coil from cylinder 3 (the one that was changed ) and exchanges it with the cylinder 1 coil. Now driving I get the same pending codes again P0303 & P0353.

What do you guys think ??

Any assistance or comments are appreciated.





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[wjburken]

What’s up guys

Need some help here

About 2 months ago I had a misfire in cylinder 3 with a flashing check engine light

I replaced the ignition coil and it immediately fixed the issue. I then went ahead and changed all the plugs and wires.

Now the 2 days ago about 45 min into an hour drive and I get another cylinder 3 misfire code P0353 solid check engine light and 2 pending codes P0303 & P0353. The mechanic cleared the codes and I went about my business.

Then yesterday I’m taking another hour plus drive and I get a flashing check engine light that stops about 3 mins after it starts. And I have 2 new pending codes P0303 & P0353. Light goes off and never comes back on. I clear the pending codes

I go to the mechanic today and he moves the coil from cylinder 3 (the one that was changed ) and exchanges it with the cylinder 1 coil. Now driving I get the same pending codes again P0303 & P0353.

What do you guys think ??

Any assistance or comments are appreciated.





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What is the condition of the harness going to the coil?

 

[Nap73]

What is the condition of the harness going to the coil?

Mechanic says it’s good.


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[wjburken]

Mechanic says it’s good.


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Might be worth the time to take a meter and check for resistance and continuity to rule that part of the equation out.

 

[Nap73]

Might be worth the time to take a meter and check for resistance and continuity to rule that part of the equation out.

I’ll do that


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[kbuskill]

Could also be an injector acting up.

You could swap the #3 injector around with the #1 injector and see if the issue persists.

 

[Nap73]

Could also be an injector acting up.

You could swap the #3 injector around with the #1 injector and see if the issue persists.

That’s exactly what was done.


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[kbuskill]

That’s exactly what was done.


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You said he swapped coils... you didn't mention he swapped fuel injectors too.

 

[Doubeleive]

That’s exactly what was done.


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you said the coil was swapped not the injector

 

[swathdiver]

What’s up guys

Need some help here

About 2 months ago I had a misfire in cylinder 3 with a flashing check engine light

I replaced the ignition coil and it immediately fixed the issue. I then went ahead and changed all the plugs and wires.

Now the 2 days ago about 45 min into an hour drive and I get another cylinder 3 misfire code P0353 solid check engine light and 2 pending codes P0303 & P0353. The mechanic cleared the codes and I went about my business.

Then yesterday I’m taking another hour plus drive and I get a flashing check engine light that stops about 3 mins after it starts. And I have 2 new pending codes P0303 & P0353. Light goes off and never comes back on. I clear the pending codes

I go to the mechanic today and he moves the coil from cylinder 3 (the one that was changed ) and exchanges it with the cylinder 1 coil. Now driving I get the same pending codes again P0303 & P0353.

What do you guys think ??

Any assistance or comments are appreciated.





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Ok, With the coil swapped, the mechanic should have hooked up his bi-directional scan tool and verified that all ignition control circuits displayed OK. This means that there was no Short To Ground, Short To Open or Short To Volts.

If there is, fix the wiring. If all is ok with wiring, replace the ECM.

If the engine runs too long like this, it could take out the cats.