2009 DB9 Volante coil plug problem at 70,000 miles

[rick64]

Anyone can help ?

I have to remove one of coil and look before ordering, 2 pins coils or 3 pins coils for replacement as it have a misfire in idle. Or 2009 DB9 have a fast reference listing to check for coil in according to engine number/chassis number. 3 pins coils is a latest and improvement one ? because the NGK plug is also improved from 2009 base on AM's parts reference listing.

Which one of OBD II scanner is recommend/suit for DB9 at reasonable price via ebay, I would like to ensure which one coils have a fault and replace it instead of change it all.


Thank you in advance for your helping.

[fuzzy01]

Methinks 70K, take it to a main dealer and change all the plugs and coils, its standard good practice as its in bits.

[V12Vanquish]

It's the same work to get to one, so change them all while the inlet manifold is off.

[8Tech]

I would not automatically assume that an idle misfire is a coil. Any decent garage will have an OBD code reader and this should indicate which cylinder is missing, but may not diagnose the coil. You could also have an air leak from the inlet manifold gasket that will have little effect as soon as the revs build.

A failing coil would normally show more under load at low rpm, such as in a high gear, at low speed, on a high throttle setting where a good spark is needed.

A decent smoke test should show up any intake leaks. If not, and you can determine which cylinder has the misfire, then I would replace that coil when you do the plugs anyway.

[SS972]

On a 09 it must be the three pin coils, I would change them all 12 with the plugs.It's a 6/8 hours job, the most fidly bit being the wiring loom brackets at the rear of the cam covers.I also ordered the inlet manifold gaskets and injectors O-rings.

[rick64]

Thank you all of you

I will order 3 pins coils and plug from UK, and post back
To my place.

I would like to order odb2 scanner for myself, any brand
Suggestion as I have no idea on this tools

[rick64]

Thank you all of you

I will order 3 pins coils and plug from UK, and post back
To my place.

I would like to order odb2 scanner for myself, any brand
Suggestion as I have no idea on this tools

[8Tech]

Most OBD2 code readers should read the engine systems. The chassis systems need a specific AM software package.

I use the Snap-On Solus but for a hobby system, thats a tad pricey although used ones do crop up regularly on ebay. I have seen silly cheap OBD readers but cannot comment on how or if they work as I have never used them.