Fuel Injector replacement
- Thread starter dponce1
- Start date
ScarabEpic22
Member
Do you have confirmation the injector(s) are bad? I rarely see GM fuel injectors go bad, sometimes they can get stuck closed if they've been sitting in old fuel for years. Not a problem on a daily.
If you have a misfire, start with the basics: air, fuel, spark. Focus on fuel/spark for the 1.4t for now.
The OEM coil pack on the 1.4T is known to be weak, pull it off and make sure the boots aren't corroded or broken. Check your spark plug gap, coupled with the weak factory coil and a turbo, we can get spark blow-out which causes a misfire. Regap them to 0.28. Refer to this thread for more info: http://www.sonicownersforum.com/forum/1-4l-turbo-sonic-engine-discussion/4118-spark-plug-gap-6.html
If you have a misfire code, try swapping the fuel injector between cylinders to see if the code follows the injector. It's pretty straightforward to pull the fuel rail off these cars, it's right on top near the firewall.
Hate to see you throwing $$ at injectors when they may not be the problem, if some basic diagnostics show they're bad, then go for it!
If you have a misfire, start with the basics: air, fuel, spark. Focus on fuel/spark for the 1.4t for now.
The OEM coil pack on the 1.4T is known to be weak, pull it off and make sure the boots aren't corroded or broken. Check your spark plug gap, coupled with the weak factory coil and a turbo, we can get spark blow-out which causes a misfire. Regap them to 0.28. Refer to this thread for more info: http://www.sonicownersforum.com/forum/1-4l-turbo-sonic-engine-discussion/4118-spark-plug-gap-6.html
If you have a misfire code, try swapping the fuel injector between cylinders to see if the code follows the injector. It's pretty straightforward to pull the fuel rail off these cars, it's right on top near the firewall.
Hate to see you throwing $$ at injectors when they may not be the problem, if some basic diagnostics show they're bad, then go for it!
I had a bad miss that drove me crazy, I finally changed the coil pack.That was 2 months ago = I haven't felt a miss since. I purchased a cheap one aprox $45 I was so happy I purchased another for the future. If I feel it miss fire again I am changing out the coil pack first. I own a 2012 Sonic Lt
With 130K
Sent from my SAMSUNG-SM-G920A using Tapatalk
With 130K
Sent from my SAMSUNG-SM-G920A using Tapatalk
I 99% guarantee you do not have a failing injector. Its either PCV failing, bad coil packs, bad plugs, or bad coil pack harness
2015sonicspin
New member
The coil packs are notorious for going bad. I replaced mine and all my miss/bucking issues were solved
Stew
Sedans Rule!
On my 3rd coil pack here too. First one was bad enough to cause misfiring around 47k miles, I replaced with another OEM unit which started causing misfires again around 105k miles. For the 3rd one I bought one at the local auto parts store, we'll see if that lasts longer, it was about half the price as the crappy OEM part. Both times the springs and cup corrode severely.
