I have read the posts around S4 Spiders with interest. The problem I have is subtley different so any advice would be welcome.
My car has just developed a poor starting habit. Starter motor turns the engine over well but even after 5-10 seconds of cranking it refuses to start. I don't get any Tach blip - suggesting that the eCU isnt . If I try again to start a second or third time, I will eventually get a tacho blip. Try once more and it will start and run smoothly after a drive it will usually restart for the remainder of the day...but back to square one if left overnight.
The car has had new plugs and leads 2-3 months ago and are not on the suspect list. I have just replaced the dizzy cap and rotor arm to no effect. I will replace the battery and finally the coil as my next step - even though the coil tests ok although not to spec.
The Crank Sensor has been replaced at some stage and looks to be gapped within tolerance. The original artice is still tie-wraped into the loom.
I suspect that there is no Tach blip point to battery issue rather than the coil. I guess I am talking to myself but if the voltage drop during cranking fails to switch the eCU up then further cranking will probably cause a bigger drop so it should never start ? Unless the starter starts drawing less current
I am stumped
Any suggestions ?
l
My car has just developed a poor starting habit. Starter motor turns the engine over well but even after 5-10 seconds of cranking it refuses to start. I don't get any Tach blip - suggesting that the eCU isnt . If I try again to start a second or third time, I will eventually get a tacho blip. Try once more and it will start and run smoothly after a drive it will usually restart for the remainder of the day...but back to square one if left overnight.
The car has had new plugs and leads 2-3 months ago and are not on the suspect list. I have just replaced the dizzy cap and rotor arm to no effect. I will replace the battery and finally the coil as my next step - even though the coil tests ok although not to spec.
The Crank Sensor has been replaced at some stage and looks to be gapped within tolerance. The original artice is still tie-wraped into the loom.
I suspect that there is no Tach blip point to battery issue rather than the coil. I guess I am talking to myself but if the voltage drop during cranking fails to switch the eCU up then further cranking will probably cause a bigger drop so it should never start ? Unless the starter starts drawing less current
I am stumped
Any suggestions ?
l