2001 V70 2.4T bad ignition coil replacement...

Post by **regent** » 05 Sep 2012, 16:48

Trimming the insulating boot may help prolong the coil's life if it has no internal failure. Cleanliness when handling and installing plugs and coils will also help prevent surface leaks and premature failure. These coils work under lots of stress due to heat; oil contamination is another 'insulation killer'. When I do plugs, I would vacuum the ports just before removing the plugs, and would also clean the coils' boots with some alcohol.

ONV70XC · Post by **ONV70XC** » 05 Sep 2012, 18:20

Do you necessary see 'Check Engine' light when you feel coils need replacement?

Post by **precopster** » 06 Sep 2012, 04:24

The check engine light pointing you to the correct coil (by means of a coil number specific code) is usually the final phase in coil failure.

No point in suspecting them yet because you would need to buy a new one and swap it into each of the 5 positions then drive it some on each new position to be sure and that would just be a waste of time.

GreekXC70 · Post by **GreekXC70** » 09 Sep 2012, 11:42

Thanks, great post even allowed someone who hates to work on cars like myself to fix the problem; and truly it wasn't that hard after I got the engine covers off. I'm not sure how much I saved, but I bet is was significant ... my wife was shocked I was able to fix it.

ez4u · Post by **ez4u** » 17 Oct 2012, 09:27

: image.jpg (264.78 KiB) Viewed 4225 times

Hey guys,
I have a 98S70 non turbo, I have a P0304 cylinder 4 misfire detected. When I tried to change the cylinder coil, mine are different. Plz see pic. So, now I don't know if I should change the spark plug wires or the main coil which delivers elect for all five cylinders. Any suggestions. Thanks.

Post by **precopster** » 17 Oct 2012, 16:03

'98s have leads and a distributor cap and rotor button. Because the OBD system narrowed it down to cylinder misfire I would first check the corresponding spark plug first (to check for damage) and then pickup a set of leads. ONLY use Bougicord which are OEM. The other brands don't seem to work at all well.

ez4u · Post by **ez4u** » 17 Oct 2012, 18:21

Ironically, I changed the spark plugs about 5k miles ago, with NGK brand. They weren't the cheapest but priced mid range. So, I thought they should be ok. Bougicord ... Is this the park plug brand or the wire brand?
Thanks

Post by **precopster** » 17 Oct 2012, 18:27

Volvo brand plugs are OEM. Bougicord is the brand of wire Volvo use.

Post by **precopster** » 21 Oct 2012, 03:17

My wife's 850; Goldie as we call her had a misfire over the weekend so I posted in the 850 forum about it : https://www.matthewsvolvosite.com/forums ... =1&t=52348

Post by **BobbyC777** » 14 Dec 2012, 16:19

Great writeup and pix!

The only thing I'd add pertains to the "turbo air delivery unit". My experience was that just removing the two T25 Torx fasteners was not enough to get the pipe to move at all. The pipe has a hose connector at either end. I loosened the 7mm fastener on the rear clamp and this allowed me to pull it out of the sleeve and raise the pipe enough to allow plenty of access to get the plastic covers off and gain access to coil packs and plugs. I didn't have to remove the front clamp but it sure looked like it would be tough to get to.

2001 V70 2.4T bad ignition coil replacement...

Re: 2001 V70 2.4T bad ignition coil replacement...