DR_EviL Posted May 22, 2019 Report Share Posted May 22, 2019 Hi I have a car in for tuning that runs very badly, at first I thought it was a trigger issue due to the cam and crank signals being at the same time. While swapping trigger edge for the cam I noticed the spark is so weak that I cannot get my timing light to trigger. Coils are BOSCH 0221504006. Testing the coil outputs in the software I have sparks that will barely jump a 2/3mm gap, Is this normal for the test mode or should I see full power? Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 22, 2019 Report Share Posted May 22, 2019 That coil does not look like it has a built-in ignitor, do you have an ignitor connected? Quote Link to comment Share on other sites More sharing options...
DR_EviL Posted May 22, 2019 Author Report Share Posted May 22, 2019 So it's actually possible to get a spark out of the coil even though it doesn't have a built in ignitor? I'm not 100% sure, I didn't build or wire this one, it just came in for tuning. I hate it when they arrive on a tow truck! Just wired in a R8 coil I had laying about for testing and the spark is very strong. Quote Link to comment Share on other sites More sharing options...
Richard Hill Posted May 22, 2019 Report Share Posted May 22, 2019 Yes it is possible to spark without an igniter. I even had a car which actually just ran (barely) without an ignition amplifier. Quote Link to comment Share on other sites More sharing options...
DR_EviL Posted May 22, 2019 Author Report Share Posted May 22, 2019 16 minutes ago, Richard Hill said: Yes it is possible to spark without an igniter. I even had a car which actually just ran (barely) without an ignition amplifier. That is what this car is doing, it runs but very badly. Quote Link to comment Share on other sites More sharing options...
DR_EviL Posted May 22, 2019 Author Report Share Posted May 22, 2019 3 hours ago, Adamw said: That coil does not look like it has a built-in ignitor, do you have an ignitor connected? Do you have any information on the wiring of this Bosch coil? Quote Link to comment Share on other sites More sharing options...
Simon Posted May 23, 2019 Report Share Posted May 23, 2019 To confirm if an igniter is needed measure between the 12V feed and the signal in, If its low around 1 ohm then an igniter is needed. Quote Link to comment Share on other sites More sharing options...
DR_EviL Posted May 23, 2019 Author Report Share Posted May 23, 2019 6 hours ago, Simon said: To confirm if an igniter is needed measure between the 12V feed and the signal in, If its low around 1 ohm then an igniter is needed. I get 0.4 ohms Thanks for your help, I will fit a set of coils with built in ignitors. Quote Link to comment Share on other sites More sharing options...
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