Other Reasons For Misfire Than Spark Plugs Or Ignition Coil?

ajck · Nov 3rd, 2018, 23:23

My 2002 s60 2.0T was in storage for a few years, got it back on the road and drove fine for a while then developed a misfire (scanner reported P0305 code) so replaced spark plug in cylinder 5, got a bit better for a few journeys but engine still sputtering slightly and then same code appeared again so replaced ignition coil and problem got worse - engine light on and same code again. Not sure what else to try, any suggestions please? Looking for cheapest route to a solution of course...Thanks

b1mcp · Nov 4th, 2018, 00:24

Fuel Injector?

As a general rule with a single cylinder misfire try swapping components between cylinders and see if the fault follows.

reggit · Nov 4th, 2018, 08:09

The 3 things to check are; compression, fuel and spark. You’ve already done the last one. Try and swap the injectors, if that doesn’t work, get a compression gauge and check all 5 cylinders (pull the fuse for the injectors first)

AndyV7o · Nov 4th, 2018, 09:33

Further to that you then need to check inlet, if the inlet gasket has failed on one port due to age this could cause it. It much less likely than the other things, but the paper gaskets can rot-out with moisture when stood.

ajck · Nov 4th, 2018, 11:59

Thanks all. How do you swap the fuel injector? Can’t really find anything on it via Google or YouTube (the one good video is blocked in my country - UK)

barrybritcher · Nov 5th, 2018, 11:28

Pretty easy. Unscrew the torx screws on the plastic cover over the injectors which are on the intake manifold. Undo the electrical connectors on all five injectors. Push something on the valve on the end of the rail into a rag to release fuel pressure. Undo the fuel pipe supply to the rail. Remove the rail. Injectors are held into the rail with screws but do the swapping on a table

Georgeandkira · Nov 5th, 2018, 12:14

Replacement "O" rings and a small amount of lube (petroleum jelly or a light smear of silicone paste, I believe) are needed for reassembly.

big_yin · Nov 5th, 2018, 13:49

Which spark plugs are you using?
Are these Volvo sparks plugs or another brand?

barrybritcher · Nov 10th, 2018, 23:57

any luck? I could make a video for you if you wish

ctownshend · Nov 15th, 2018, 21:16

a burnt or damaged valve will cause a misfire

Nov 3rd, 2018, 23:23	#1
ajck New Member Last Online: Sep 6th, 2019 16:17 Join Date: Feb 2018 Location: London	Other Reasons For Misfire Than Spark Plugs Or Ignition Coil? My 2002 s60 2.0T was in storage for a few years, got it back on the road and drove fine for a while then developed a misfire (scanner reported P0305 code) so replaced spark plug in cylinder 5, got a bit better for a few journeys but engine still sputtering slightly and then same code appeared again so replaced ignition coil and problem got worse - engine light on and same code again. Not sure what else to try, any suggestions please? Looking for cheapest route to a solution of course...Thanks

Nov 4th, 2018, 00:24	#2
b1mcp Senior Member Last Online: Apr 9th, 2024 22:14 Join Date: Mar 2008 Location: Manchester	Fuel Injector? As a general rule with a single cylinder misfire try swapping components between cylinders and see if the fault follows. __________________ 2001 V70 T5 2015 XC60 D5 R Design AWD

Nov 4th, 2018, 08:09	#3
reggit Premier Member Last Online: Apr 17th, 2024 20:01 Join Date: Feb 2012 Location: Preston	The 3 things to check are; compression, fuel and spark. You’ve already done the last one. Try and swap the injectors, if that doesn’t work, get a compression gauge and check all 5 cylinders (pull the fuse for the injectors first) __________________ 2009 Volvo V70 D5 (Polestar 225bhp) r-design 180,000 miles

Nov 5th, 2018, 11:28	#6
barrybritcher Flaccid Member Last Online: Apr 15th, 2024 16:09 Join Date: Nov 2016 Location: Norwich	Pretty easy. Unscrew the torx screws on the plastic cover over the injectors which are on the intake manifold. Undo the electrical connectors on all five injectors. Push something on the valve on the end of the rail into a rag to release fuel pressure. Undo the fuel pipe supply to the rail. Remove the rail. Injectors are held into the rail with screws but do the swapping on a table __________________ 2001 Volvo S60 T5 SE 2.3 Geartronic (Scrapped) 2007 Volvo S60 T5 SE 2.4 Geartronic (Sold) 2008 Volvo V70 D5 SE Sport Geartronic (Current)

Nov 5th, 2018, 13:49	#8
big_yin Senior Member Last Online: Yesterday 12:56 Join Date: Aug 2006 Location: Hexham, Northumberland	Which spark plugs are you using? Are these Volvo sparks plugs or another brand? __________________ 2004 V70 D5

Nov 4th, 2018, 09:33	#4
AndyV7o Premier Member Last Online: Jun 21st, 2021 20:47 Join Date: Jun 2018 Location: Creswell	Further to that you then need to check inlet, if the inlet gasket has failed on one port due to age this could cause it. It much less likely than the other things, but the paper gaskets can rot-out with moisture when stood.

Nov 4th, 2018, 11:59	#5
ajck New Member Last Online: Sep 6th, 2019 16:17 Join Date: Feb 2018 Location: London	Thanks all. How do you swap the fuel injector? Can’t really find anything on it via Google or YouTube (the one good video is blocked in my country - UK)

Nov 5th, 2018, 12:14	#7
Georgeandkira Premier Member Last Online: Apr 17th, 2024 16:59 Join Date: Feb 2009 Location: Hackensack	Replacement "O" rings and a small amount of lube (petroleum jelly or a light smear of silicone paste, I believe) are needed for reassembly.

Nov 10th, 2018, 23:57	#9
barrybritcher Flaccid Member Last Online: Apr 15th, 2024 16:09 Join Date: Nov 2016 Location: Norwich	any luck? I could make a video for you if you wish __________________ 2001 Volvo S60 T5 SE 2.3 Geartronic (Scrapped) 2007 Volvo S60 T5 SE 2.4 Geartronic (Sold) 2008 Volvo V70 D5 SE Sport Geartronic (Current)

Nov 15th, 2018, 21:16	#10
ctownshend New Member Last Online: Apr 18th, 2020 23:31 Join Date: Jan 2017 Location: Cornwall	a burnt or damaged valve will cause a misfire

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