Help with missfiring
Thread Starter
Driver School Candidate
Joined: Jan 2018
Posts: 5
Likes: 0
From: Fl
Help with missfiring
so my car would every so often idle very rough and the rpm needle would bounce between 750 and 250. Now it’s everytime the car is warmed up so I️ scanned I️t and got a missfiring code in cylinder 5 and 6. I’m changing the plugs and cleaning the tb but I️ was wondering if I️t could be the coil pack. To my knowledge each coil pack fires 2 cylinders. I️ believe it’s cylinders (1 and 6) (5 and 2) and (3and 4)
Thread Starter
Driver School Candidate
Joined: Jan 2018
Posts: 5
Likes: 0
From: Fl
I️t wouldn’t be a coil pack since 5 and 6 are missing right? This has also been happening for a while and I️ drive my car till the gas light comesOn, doubt it’s moisture in the tank
Intermediate
Joined: Mar 2013
Posts: 298
Likes: 19
From: Md
Well lemme tell you. My 03 LX470 did the exact same thing. 2 cylinders were misfiring. Check engine was blinking, scanner said my cats are bad, it didn't cut off but was idled real low like yours in the 200rpm range. I changed my plugs & it still was stalling. Then I changed the 2 bad coil packs. Saw a video on YouTube about pouring lacquer thinner in your tank to clean the fuel system. Then drove the truck til it had like 2 miles to empty. Still misfiring, so I Pour a gallon of lacquer thinner in my tank & filled to 1/4th tank. I drove around on that mixture until empty & my light came on again then refilled with premium fuel. & during the drive it was hesitating & then like after 5mins of driving it stopped stalling, check it again with my scan tool & all the codes went away. CEL went off, cats are good. Ran normal ever since. I did this Feb 2017 Thinner has more cleaner solvents than regular gas treatments. Then it's excellent at absorbing moisture. Also clean out your throttle with throttle cleaner and a brush to break up that carbon build up. That'll cause your problem too! Hope this helps.
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Thread Starter
Driver School Candidate
Joined: Jan 2018
Posts: 5
Likes: 0
From: Fl
Well lemme tell you. My 03 LX470 did the exact same thing. 2 cylinders were misfiring. Check engine was blinking, scanner said my cats are bad, it didn't cut off but was idled real low like yours in the 200rpm range. I changed my plugs & it still was stalling. Then I changed the 2 bad coil packs. Saw a video on YouTube about pouring lacquer thinner in your tank to clean the fuel system. Then drove the truck til it had like 2 miles to empty. Still misfiring, so I Pour a gallon of lacquer thinner in my tank & filled to 1/4th tank. I drove around on that mixture until empty & my light came on again then refilled with premium fuel. & during the drive it was hesitating & then like after 5mins of driving it stopped stalling, check it again with my scan tool & all the codes went away. CEL went off, cats are good. Ran normal ever since. I did this Feb 2017 Thinner has more cleaner solvents than regular gas treatments. Then it's excellent at absorbing moisture. Also clean out your throttle with throttle cleaner and a brush to break up that carbon build up. That'll cause your problem too! Hope this helps.
Thanks for the detailed response and I’ve heard of people using lacquer thinner but I’m concerned about how well that is for my car. I’ve heard mixed responses on the topic.
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Intermediate
Joined: Mar 2013
Posts: 298
Likes: 19
From: Md
Well I can tell you this, I did it in February 2017 & today my truck still running strong. The trick is once you pour in your tank, cycle it thru your system. Drive the car until you empty the tank. Don't just pour it & leave mix with your gas & sit overnight. I'm telling you it cleaned everything. Injectors, spark plugs, O2 sensors, catalyst system. My scanner displayed everything in the green as good afterwards
Lexus Champion
Joined: Sep 2016
Posts: 2,047
Likes: 135
From: AB
Well I can tell you this, I did it in February 2017 & today my truck still running strong. The trick is once you pour in your tank, cycle it thru your system. Drive the car until you empty the tank. Don't just pour it & leave mix with your gas & sit overnight. I'm telling you it cleaned everything. Injectors, spark plugs, O2 sensors, catalyst system. My scanner displayed everything in the green as good afterwards
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