After driving back last night with a misfire under load, the rev counter was flapping all over the place, so I assumed the coil was on it’s way out, or I knocked a wire loose after cleaning up the bullet connectors yesterday? I got it home and hoped to fix it today.
Went to start it to move it, and it turned over once, and then was just clicking. I checked the battery voltage and it’s down to 11.8v, (using a big 075 battery which never has a problem starting it and is fairly new)
The only thing I’ve noticed is that there is oil on the alternator belt, and the alternator spins quite easily without moving the belt, but I’m sure it’s tight enough, and it does spin when I try to turn it over.
I’m stumped what to check for, and I can’t jump start it until my dad gets home with his car. I’ve got an aldon yellow dizzy waiting to go on, and was going to order a new coil, can anyone also recommend a coil suitable as it says not to use a flame thrower etc
if its clicking then it means the battery doesnt have enough power to power the starter motor
your altenator might have gone, which would of led to poor running
when your dad gets home try and jump start it if it does start then put your multimeter across the terminals and if the altenator is working it should read around 14v if not you have a broke altenator
with the belt it should only turn 90* across it widest span
if its clicking then it means the battery doesnt have enough power to power the starter motor
your altenator might have gone, which would of led to poor running
when your dad gets home try and jump start it if it does start then put your multimeter across the terminals and if the altenator is working it should read around 14v if not you have a broke altenator
with the belt it should only turn 90* across it widest span
Yeah battery is only at 11.8 so nowhere near enough to start it haha. The alternator was a new unit last year as well, but if needs be I have a spare. Again, yeah I’m sure the belt is tight enough as its been working fine previously and never had any starting issues.
Would the alternator being bad have caused the erratic Rev counter and the misfire then?
The misfire doesn’t = bad coil. The symptoms you describe indicate a fault in the low tension side of the coil so check all connections on that once you have sussed the low voltage. I can’t imagine low voltage would be causing the misfire however it is worth checking once you have it jumped.
The misfire doesn’t = bad coil. The symptoms you describe indicate a fault in the low tension side of the coil so check all connections on that once you have sussed the low voltage. I can’t imagine low voltage would be causing the misfire however it is worth checking once you have it jumped.
No I didn’t think it would be linked either but it’s strange that it’s gone flat over night as there’s nothing really to drain it etc. so must have flattened it on the way home driving with the lights on
If the belt has oil on it and you can turn the alternator with out the belt moving and its got 12mm of play at its longest run, the belt needs replacing and you need to find the cause of the oil getting onto it.
If you tested the voltage this morning at 11.8v then yes the battery is flat, and driving home last night with the lights on then the battery would have been supplying the current, so the voltage would have been lower to the point the spark from the coil would have been very low, and thus the LT voltage would have dropped beyond what is required to power the coil, just my therory.
Get a new belt see where the oils coming from and rectify, charge the battery, refit and then carry out a check on the alternators output to confirm if its charging ok.
If the belt has oil on it and you can turn the alternator with out the belt moving and its got 12mm of play at its longest run, the belt needs replacing and you need to find the cause of the oil getting onto it.
If you tested the voltage this morning at 11.8v then yes the battery is flat, and driving home last night with the lights on then the battery would have been supplying the current, so the voltage would have been lower to the point the spark from the coil would have been very low, and thus the LT voltage would have dropped beyond what is required to power the coil, just my therory.
Get a new belt see where the oils coming from and rectify, charge the battery, refit and then carry out a check on the alternators output to confirm if its charging ok.
Great help thankyou. New belt is now on order, so hopefully this will solve it. The oil I first thought was seeping out of the head, as it is just around the head gasket area, but upon looking further it’s underneath the thermostat as well, and mainly on that side of the block. After reading up I now need to check the rivet on that side of the head, which worryingly I can not feel… Head gasket itself is fine, good compression, no water use, stays at 85c all day and runs sweet, aside from the misfire last night from low voltage.
