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Random misfire-no CEL Topic is solved

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
ThommyKent
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Re: Random misfire-no CEL

Post by ThommyKent » Sun May 14, 2017 2:21 pm

I think your thoughts are exactly right, either a plug or coil.

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Legofan
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Re: Random misfire-no CEL

Post by Legofan » Sun May 14, 2017 3:09 pm

Ok, since I don't have any patience I parked it in the shade with hood open and made a sandwich.

A couple things, pulled coil #5 and there was oil in the spark plug cavity. This is partially my fault due to cleaning out a leak on top of the heat the ornery day. The front left upper engine mount bolt that is stripped out by some previous mechanic barbarian is leaking. This is something that I have been trying to repair for the last month, but it still seems to weep oil. Today I cut a two inch piece of 14g electrical wire, stripped the insulation and dropped it down the hole for the bolt. Lathered on some RTV and screwed the bolt in and it tightened down. Before I could spin it with a ratchet easily, whether that holds we'll see.

Back to the #5 cylinder, cleaned out all the residue and oil, cleaned the coil and cleared the codes. Drove it around and so far so good.

Side note, I cleaned up the wiring and somehow mashed one to the VVT solenoid pins to the side which also threw a code. Sooo, I fixed that as well after a few select words regarding my handy work.

I'll update in a few days whether this resolve my misfire code.
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Last edited by Legofan on Sun May 14, 2017 6:07 pm, edited 1 time in total.
2001 S80 T6 Moondust sent to auction for scrap

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Legofan
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Re: Random misfire-no CEL

Post by Legofan » Sun May 14, 2017 3:27 pm

ThommyKent wrote:
Sun May 14, 2017 2:21 pm
I think your thoughts are exactly right, either a plug or coil.
Hey, you get to see the upside down plug those clowns put in.
2001 S80 T6 Moondust sent to auction for scrap

Cees Klumper
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Re: Random misfire-no CEL

Post by Cees Klumper » Mon May 15, 2017 12:03 am

I hope it all holds but don't be surprised if the misfire comes back and it's the no 5 coil.

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Legofan
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Re: Random misfire-no CEL

Post by Legofan » Mon May 15, 2017 5:19 am

Cees Klumper wrote:
Mon May 15, 2017 12:03 am
I hope it all holds but don't be surprised if the misfire comes back and it's the no 5 coil.
Some R&D genius thought an engine mount bolt should go between cylinder 5 and 6, nothing surprises me anymore with this car. It's just one bad design decision after the other. That being said, I do love the car.
2001 S80 T6 Moondust sent to auction for scrap

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