Worse gas mileage after ignition coils?
#1
Worse gas mileage after ignition coils?
I had a misfire on 3 of my coils. I changed the ones that were misfiring and haven't had any check engine codes return.
But since I changed the 3 coils, my mileage has been worst. Same type of driving, same premium gas from same gas station. Normal tank I get around 260 miles. Now, I'm getting 219 with the gas light on!
Any chance this is related to the coils?
But since I changed the 3 coils, my mileage has been worst. Same type of driving, same premium gas from same gas station. Normal tank I get around 260 miles. Now, I'm getting 219 with the gas light on!
Any chance this is related to the coils?
#2
Senior Moderator
What type of coils did you use?
#3
Latent car nut
iTrader: (2)
How long did you drive the car with the bad coils? I ask because you may have damaged the catalytic converter if you drove too many miles.
#5
Moderator
You had 3 miss fires at the same time? Did the car run badly as in The coil was not firing?
OR you just went and replaced the 3 coils without diagnose?
OR you just went and replaced the 3 coils without diagnose?
#6
Senior Moderator
Originally Posted by OTHREETLS
I got them from Amazon after reading a lot of people did the same thing instead of paying $70 each. I also changed them like a week after the check engine light came on
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#8
The car seemed to run fine, but the check engine came on for the second time and gave misfire codes. The shop recommended I change coils
#9
Senior Moderator
#10
#11
Senior Moderator
Now you get to just pay for extra gas instead!
You don't need to replace all 6.. just the ones that are bad.
![Tomato](https://acurazine.com/forums/images/smilies/tomato.gif)
You don't need to replace all 6.. just the ones that are bad.
#12
Latent car nut
iTrader: (2)
#13
Moderator
![Frown](https://acurazine.com/forums/images/smilies/frown.gif)
I will advise you not to pull the trigger on what some shop tells you right away and get second opinions next time. Bad coil plugs are a common issue here in the forums so we already know how to properly diagnose them and its very easy (no need for mechanic).
#14
If car idles rough it’s essy to troubleshoot coil issues. Just disconnect the harness on each coil one at a time. Car should idle even worse with each coil you disconnect. When one doesn’t change, that’s a good indication you found the bad coil or spark plug. Then swap coil with an existing to verify, or spark plug to nail which is bad.
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Homestead12
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09-27-2017 11:07 AM