2000 V70 NA - Coil misfire on all cylinders?

Post by **abscate** » 20 Mar 2022, 16:32

Little bit of pcv pressure , moisture condensing under the cover, lack of maintenance ftom 100k mile rated spark plugs…

Post by **scot850** » 20 Mar 2022, 19:39

Nope. I did all that before selling it 40,000km ago. Full pcv service, new Volvo Plugs and coils although one failed at about 25,000km and was replaced by this NAPA version. Almost looked like it leaked something from under the coil head.

Neil.

Post by **abscate** » 21 Mar 2022, 03:50

Nothing is dry in our climates. Water is always condensing and depositing in stuff under hood. Once it starts , green corrosion spreads fast.

Post by **RickHaleParker** » 21 Mar 2022, 03:59

It is called Galvanic corrosion. You need three things for it to form.
1. An electrolyte, water with impurities can form a electrolyte.
2. Pair of electrically dissimilar metals.
3. Electrical current, the source of that is obvious.

Post by **scot850** » 21 Mar 2022, 11:49

The strange thing with all this is it only affected the one coil that my buddy affected. So maybe the NAPA coil materials are different to the OE parts?

Guess we will never know but thanks Rick for your wise words as usual!

Neil.

Post by **RickHaleParker** » 22 Mar 2022, 10:41

scot850 wrote: 21 Mar 2022, 11:49 So maybe the NAPA coil materials are different to the OE parts?

Could be. One might be Aluminum to match the head and the other something like steel. Copper / Aluminum is real subject to Galvanic corrosion.

All them Solar Thermal panels that where installed in the 70s where gone in 20 years. Because they where soldering Copper pipes to Aluminum absorber plates.

Post by **scot850** » 22 Mar 2022, 10:55

And Volvo who test their vehicles for cold winter conditions, decided to use aluminum in their suspension systems in the P80 AWD and P2 cars and then use steel bolts to hold in place with no interface. Guess what happens...........!

Neil.