Mix of symptoms....

Richard B

Member
Hi All

I have an auto P6B with Lumenition ignition. Recently my rev counter started reading erratically with the needle jumping wildly over the rev range. It has also started to require a lot of cranking before it fires up and even then it seems not to be firing on all cylinders initially, after a few seconds it is fine. Today I cleaned up the rotor arm and dizzy cap contacts with emery paper...... still took ages to start but the rev counter was stable. So what is wrong? Coli? Lumention on the way out?

The engine runs sweetly when it's warm and the choke is in.... although stalls very occasionally at junctions.

Any suggestions gratefully received

Thanks

Richard
 
First thing would be to check the strength of the spark. Pull a spark plug and connect its lead to to it. Ground the threaded part of the plug to the chassis (you want good conductivity so unpainted metal is best) and get someone to turn the engine over on the starter. You should have a fat spark there. If not, next thing is to connect that lead directly to the coil and try again. If the spark is noticeably stronger suspect the cap or rotor, if not suspect the coil or ignition module.
 
First thing would be to check the strength of the spark. Pull a spark plug and connect its lead to to it. Ground the threaded part of the plug to the chassis (you want good conductivity so unpainted metal is best) and get someone to turn the engine over on the starter. You should have a fat spark there. If not, next thing is to connect that lead directly to the coil and try again. If the spark is noticeably stronger suspect the cap or rotor, if not suspect the coil or ignition module.
Really helpful .... thanks
 
When starting from cold. When warm it needs small amount of choke but starts easily

The long cranking time is probably the fuel running back to the tank while the car is standing, and as said elsewhere, if it needs choke when it's hot then it's running weak.
 
The long cranking time is probably the fuel running back to the tank while the car is standing, and as said elsewhere, if it needs choke when it's hot then it's running weak.
thanks harvey. how do you adjust the mixture?.... I thought it was factory set and something you couldn't adjust.
 
thanks harvey. how do you adjust the mixture?.... I thought it was factory set and something you couldn't adjust.

If you have HIF6 carbs, they have a tamperproof plug over the mixture screws so that they can't be adjusted..........Until you prise out the plug to reveal the screws and then you just adjust as normal.
 
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