z4m no spark any ideas on diagnostics?
Discussion
after a body repair the z4m wont start, its cranking and fuel at rail but doesnt want to fire,checked plug against head and no spark .the oil temp goes up to 135deg when turned on and doesn't fall is this normal?,alarm flashes indicators when on but not when off?she has had a few things removed for a body repair so poss overlooked some thing.
Dose any one have any help on diagnosing or checking crank sensors etc? done fuses all connections seam OK
Dose any one have any help on diagnosing or checking crank sensors etc? done fuses all connections seam OK
Oil temp sounds like you have bashed the sender or disconnected/shorted/broken the wire to it.
What sort of coil does it use, and how is it triggered? You would probably find that it's got ignition switch 12V on the +ve side, with the -ve side earthed momentarily to produce the spark. A small test lamp or 12V LED across the coil low tension side is an easy way to confirm it's being triggered. If it is then you have a faulty coil or HT problem. If not you have an LT problem and you need to measure the voltage on +ve and -ve terminals to see which is wrong.
What sort of coil does it use, and how is it triggered? You would probably find that it's got ignition switch 12V on the +ve side, with the -ve side earthed momentarily to produce the spark. A small test lamp or 12V LED across the coil low tension side is an easy way to confirm it's being triggered. If it is then you have a faulty coil or HT problem. If not you have an LT problem and you need to measure the voltage on +ve and -ve terminals to see which is wrong.
If it's a magnetic variable reluctance sensor you can measure the voltage at the sensor with an analogue meter while cranking (it produces low voltage AC).
Do you know how the rev counter is triggered? Quite possibly it's driven by the ECU, in which case if it shows anything while cranking that would show the ECU is getting something. The starter will probably only turn it over at a couple of hundred rpm though, so depending on the gauge this may not be enough to show.
Do you know how the rev counter is triggered? Quite possibly it's driven by the ECU, in which case if it shows anything while cranking that would show the ECU is getting something. The starter will probably only turn it over at a couple of hundred rpm though, so depending on the gauge this may not be enough to show.
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