Volvo S80 A performance sedan that offers top notch luxury, outstanding handling and so much more.

T6 1-3 misfire

Old 06-24-2014, 01:10 AM
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Default T6 1-3 misfire

I have a 2003 Volvo S80 T6. It is misfiring pretty badly. What I've done so far is verify that there is absolutely no vacuum leaks, smoke tests and starting fluid test. I have swapped around and tested coils which all work and I have checked it. I know the plugs are all new OEM plugs. However, where I have the problem is when I was checking the coils, I unplugged one at a time to find the one(s) that doesn't make a difference unplugged. Cylinder 1-3 makes absolutely no difference when each of them are unplugged but 4-6 on the other hand all make a difference when you unplug them. It's got the check engine lights for those cylinders and a multiple misfire code. I'm pretty stumped, I don't know if there is 1 plug for each half of the engine or if 1 plug services all 6. that go to the fuel injectors or something? Just don't understand why the coils all test good but the 1-3 cylinders don't change a bit when coils are unplugged. All coils are sparking so its gotta be fuel related in the first 3 cylinders. Any help or advice would be greatly appreciated. The turbo works and spools as well. You can feel the boost still when you drive it.

Last edited by p3n9u1n5; 06-24-2014 at 01:17 AM.
Old 06-25-2014, 03:25 AM
Join Date: Jul 2013
Posts: 31

Can you take out fuel rail with injectors and try to crank the engine to see if injectors spray? Or test injector connector with multimeter.
Old 06-25-2014, 03:56 PM
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I didn't think about taking the fuel rail off. That a pretty good idea. I wont make a huge mess will I lol? I will try that. The injectors work, I swapped one half with the working half and have the same issues in the same cylinders. I will probably try that now.
Old 06-25-2014, 04:09 PM
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Im gonna check the plugs and coils again because I took the fuel rail off and all of them were squirting the same amount. So we have gas, and I was pretty damn sure I had spark, but Im gonna check that again.
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