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Misfire - need to get home! Topic is solved

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br0dy519
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Post by br0dy519 »

Hi guys

Need an answer quick. 300km from home and getting my car from the airport after parking for a week and it’s misfiring. Sorry I know this has been asked plenty. I’m going to limp it to the auto parts store for a code read. I don’t have my reader or my 10mm or any of my 12 spare coils on me. Lesson learned.

Safe to disconnect the ignition coil for the bad cylinder and drive it home? Do i need to unplug the fuel injector as well?
04s60 2.4
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prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
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cn90
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Post by cn90 »

Actually d/c the injector is the most important thing to prevent unburned fuel going down the engine oil or in the cat.
Last edited by cn90 on 08 Mar 2026, 16:51, edited 1 time in total.
2004 V70 2.5T 100K+
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br0dy519
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Post by br0dy519 »

Thank you.

Ugh- p0300 0303 and 0305 (twice). I unplugged injector 5 and will hope for the best on this trip. Should I unplug the coil too or does that not matter ?
04s60 2.4
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
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abscate
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Post by abscate »

Does not matter. Can you tell which cylinder is bad? Try to only disconnect one
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vtl
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Post by vtl »

Do a compression test in all cylinders when you get home.

I drove 200+ miles with a hole in exhaust valve in #1, haven't disconnected anything. When Bosch ECU correctly diagnoses which cylinder is misfiring, it cuts fuel and spark from this cylinder.
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br0dy519
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Post by br0dy519 »

I got home y’all. I started poking around my car and realized I had a 10mm and a spare coil in the spare tire well! I popped it into cylinder 5 and she didn’t buck once on the way home. Good idea to do compression test. No codes came back after cleared and driven 300km.

LESSON TO ALL: ALWAYS BRING A CODE READER ON TRIPS! And a 10mm and a coil. I got lucky and the guys at the parts store let me use their reader this morning.
04s60 2.4
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
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abscate
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Post by abscate »

If you roll her 300km for work you should run on the PM model and give her a new set of coils.

The company owes you $180 just for that trip so that’s most of a set of Bosch coils from FCP

Don’t forget the torx bit for the pretty cover for that tool kit
Empty Nester
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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
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cn90
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Post by cn90 »

Note for others....
- Around town, no worry...you can always run home to get tools or drive some miles with misfire to get home.
One bad coil...ok but 2 bad coils is almost undrivable.

- Best is new coils (Bosch) as @abscate said.

- Tools in the trunk as mentioned: Code reader, Torx key (I permanently removed the engine cosmetic cover and leave it in the trunk). NOTE: early cars 10-mm but later years ---> it is 8-mm bolts (just to save a few milligrams for fuel efficiency lol).
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+
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