Classic Mini SPI Misfire :(

[1275 dave]

Hi,
I have a 1275 SPI and i have a misfire, I have changed plugs, leads, dizzy cap, rota arm, lamda senson, lcb, coil, checked for head gasket and still have a misfire please help

[cpas]

What fuel do you use? If it's 'cheap' supermarket stuff try filling up next time with something better like BP or Shell and see if it makes a difference. Also, is the fuel in the tank old and gone off?

[1275 dave]

I always fill up with Shell, bp or texaco, I use the car as my everyday drive, Im thinking there maybe a fault with the ECU but not to sure

[DanGT]

Could be the ECU,. not played with the SPi minis so not an expert, Is there a filter in the fule line?

When dose the misfire happen?

[1275 dave]

There is a filter in the fuel line, I think its the valves not seated correctly, I over heated the engine badly because the fan did not kick in and since then its just run very bad

[cpas]

You didn't tell us that bit!!!

[DanGT]

Heat dose not normaly do the valves. Are you shore the head gaskit is not leaking?

[1275 dave]

I took the head off and 2 of the valves have a small amount of oil on them,
Im going to take the head the the machine shop and get them to check it. Im going to change the head gasket aswell. The head was skimed about 6 months ago. hopefully this will fix it