Back Firing Stag

[doug2008]

Hi guys Stag running Rough Missing Plus intermitent backfire When warm, Coil seems HOT and Rev counter stopped working .Do you think coil chage good place to start Thanks Doug 2008

[V Mad]

Have you got points or electronic ignition?

[ChasR]

I was going to say.

A friend had a Dolly Sprint with a similar issue on points. It turned out to a combination of a tired distributor and a new poor quality condenser (was short circuiting).

[neil.henderson]

Hi, On a recent long run here one of the guys driving a Stag with a 6 cylinder GMH engine installed starting getting very bad misfires when asking for power, even just going up hills.
Turned out that the fuel filter was blocked, changed the filter - problem solved!! Yes, I was dubious at first but it certainly fixed the problem. We zoomed home till my coil bombed - then my car woudl not start at all - no spark - new coil fixed that & it started first turn.
Good Luck Neil

[martin]

Hi Doug, the coil often gets hot to the touch, so that's no guide, try substitution, they're cheap enough. Is the backfire on the overrun ? Martin.

[doug2008]

Hi Doug, the coil often gets hot to the touch, so that's no guide, try substitution, they're cheap enough. Is the backfire on the overrun ? Martin.

Hi thanks for intrest Changed plugs now ok but rev counter gone awolNB Plugs had V burnt in centre electrode

[stagmuffin]

Hi thanks for intrest Changed plugs now ok but rev counter gone awolNB Plugs had V burnt in centre electrode

some plugs have the v formed in the electrode from new ,i assume its something to do with spark managment or other.......

[Kevin Garrod]

Hi thanks for intrest Changed plugs now ok but rev counter gone awolNB Plugs had V burnt in centre electrode

Were they NGK BP5E plugs by any chance?

[doug2008]

hi its electronic ignition

[doug2008]

Yes they were

[Kevin Garrod]

As Steve says they have the v already.

[V Mad]

hi its electronic ignition

I bet its Lumenition.

[SwissSteve]

I had the same symptoms as that last year. After checking all of the for mentioned items, it turned
out to be a hairline crack in the distributor cap. Replaced the distributor cap and then all was fine.

Kind regards

[doug2008]

hi it is lumenition why so sure

[KOY 23]

Probably because it is the most popular system and they are getting quite old now.