Misfire? 96 LT4
#1
Drifting
Thread Starter
Misfire? 96 LT4
Well for the second time in 3 weeks I have this code.
DTC P0300 Random/Multiple Cylinder misfire detected. The car is running perfect.
Any ideas? Should I give it some new plugs? Could I have got some bad gas? Is it BS?
Thanks
DTC P0300 Random/Multiple Cylinder misfire detected. The car is running perfect.
Any ideas? Should I give it some new plugs? Could I have got some bad gas? Is it BS?
Thanks
#4
Tech Contributor
Originally Posted by USAFPILOT
Well for the second time in 3 weeks I have this code.
DTC P0300 Random/Multiple Cylinder misfire detected. The car is running perfect.
Any ideas? Should I give it some new plugs? Could I have got some bad gas? Is it BS?
Thanks
DTC P0300 Random/Multiple Cylinder misfire detected. The car is running perfect.
Any ideas? Should I give it some new plugs? Could I have got some bad gas? Is it BS?
Thanks
If the wires are original and you have significant miles on the car...>40k, they're no doubt ready for replacement. Ditto for the OEM plugs which tended to lose their platinum pucks.
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adam_stuckey (11-16-2021)
#5
Le Mans Master
Either in the dark or in your garage with the lights off, start the car with the hood up and see if you have any arcing of your wires on either side. If not, check your plugs. They could be fouled or missing a puck.
Always go with the cheapest and easy fixes first.
Always go with the cheapest and easy fixes first.
#6
Safety Car
Originally Posted by USAFPILOT
If that happend wouldn't it burn through, then continue to misfire?
Maybe - maybe not. I had a wire that touched the exhaust manifold to a point of having a burn pattern on it. That caused a mis-fire and set of the check engine light.
#7
5th Gear
Member Since: Jul 2011
Location: Bangor Maine
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I just changed my plugs and wires and car ran fine. Have ACDelco Platinum, like stock, and 8.5mm wires. Ran fine for about a week, now when I push on the throttle and give it some, even slightly, it bogs down. The code isn't on yet. Hope its not the Distributor, even though I plan on getting an MSD soon.
#8
Burning Brakes
I have a '96 too. The PO300 code is a beotch because it isn't specific to a cause. It says 'random' but it's usually one cylinder. The '96 doesn't specify like later LS1. Could be ignition or fuel delivery. If you have a good shop let them hook it up and get the misfire counts on a specific cylinder. If not try the dark place arching routine or pull each injector harness then each plug wire. If intermittent then the fun begins as nothing will be diagnosed unless it's missing.
My nightmare was human error. The idiots crossed the injector harnesses and you can't believe how difficult it was to find. It actually ran pretty good out of sequence but fired that code and SES. Brutal.
You probably have bad wires or plugs. One or more injectors could be acting up. Good luck and report results for further assistance. After new FIC injectors, Opti, wires, plugs and head work I have to say it runs strong, a far cry from the sick puppy PO300 hell on earth.
Good luck with your problem.
My nightmare was human error. The idiots crossed the injector harnesses and you can't believe how difficult it was to find. It actually ran pretty good out of sequence but fired that code and SES. Brutal.
You probably have bad wires or plugs. One or more injectors could be acting up. Good luck and report results for further assistance. After new FIC injectors, Opti, wires, plugs and head work I have to say it runs strong, a far cry from the sick puppy PO300 hell on earth.
Good luck with your problem.
#11
misfire codes
i have the same problem code will set during any type of driving. after a little research found may be a vibration/bump concern.compuyor will read this as a mis-fire.
good luck
ps. mine due to single mass flywheel
good luck
ps. mine due to single mass flywheel