[Warning Light] injector wiring diagram

[Zion]

Did you do the comp test with all plugs out, or one at a time only on the cylinder under test?

If you did the second option, I'd take all plugs out and see if numbers 2 and 3 are both low when all plugs are removed while testing. It does sound like you have a compression leak into the water jacket or head gasket issues of some description. 2 and 3 could have a joined compression leak between them, that would cause some funny issues.

[mrsavaloy]

Did you do the comp test with all plugs out, or one at a time only on the cylinder under test?

If you did the second option, I'd take all plugs out and see if numbers 2 and 3 are both low when all plugs are removed while testing. It does sound like you have a compression leak into the water jacket or head gasket issues of some description. 2 and 3 could have a joined compression leak between them, that would cause some funny issues.

hi yes all plugs were removed for compression test

[Zion]

You can get the coolant tested for combustion gases. I think Kwik fit can do that but most higher end garages would have the right kit.

That would prove if the head gasket has gone, or a crack in the head for instance between 2 and 3.

My thinking is that each could be affecting the other under load / warm etc.