What are the possible causes of intermittent loss of spark on all 6 cylinders?
Parts
aftermarket WOLFV500 ECU wasted spark and sequential fuel.
3 channel ignitor module (Bosch MS) (7 pins , ground + 3 inputs + 3 outputs)
Bosch OE wasted spark system (common +ve pin for the 3 coils and 3 -ve inputs from ignitor)
Major Symptoms
engine stalls and wont restart. problem is intermittent in that will have major issues for a day or two where wont start at all then seem to resolve itself.
sometimes will start and run for a couple seconds and stall and refuse to restart
Minor Symptoms
initially had the odd issue where it would cut out but restart fine.
on a couple occasions engine misfired for split second but resolve itself in split second
engine just stalls / cuts out does not splutter like fuel delivery issues
what works
everything else seems to work fine e.g.
- cranks fine,
- all electrical works
- fuel injectors work
- crank sensor appears to work fine (ECU reads cranking rpm) did change out with a working one but no difference
- logging on the laptop revealed nothing out of ordinary
Thoughts
- 3 channel ignitor was replaced (it seemed to initially fix problem for about 6 weeks with zero issues or symptoms) was convinced it solved the problem but issue has returned yesterday.
- could ignitor be damaged by ECU or something ?
- cam sensor seems to be ok as fuel delivery works
- crank sensor seems to be fine swapped out known good one
- could be bad connection?
- previous test of coil seemed that had 12V source not test that yet since new issues
- all 3 coils failing simultaneously is not likely
- all wires and / or plugs failing at same time seems unlikely
- could be bad ECU that has the 3 channels all fail at same time intermittently?
Parts
aftermarket WOLFV500 ECU wasted spark and sequential fuel.
3 channel ignitor module (Bosch MS) (7 pins , ground + 3 inputs + 3 outputs)
Bosch OE wasted spark system (common +ve pin for the 3 coils and 3 -ve inputs from ignitor)
Major Symptoms
engine stalls and wont restart. problem is intermittent in that will have major issues for a day or two where wont start at all then seem to resolve itself.
sometimes will start and run for a couple seconds and stall and refuse to restart
Minor Symptoms
initially had the odd issue where it would cut out but restart fine.
on a couple occasions engine misfired for split second but resolve itself in split second
engine just stalls / cuts out does not splutter like fuel delivery issues
what works
everything else seems to work fine e.g.
- cranks fine,
- all electrical works
- fuel injectors work
- crank sensor appears to work fine (ECU reads cranking rpm) did change out with a working one but no difference
- logging on the laptop revealed nothing out of ordinary
Thoughts
- 3 channel ignitor was replaced (it seemed to initially fix problem for about 6 weeks with zero issues or symptoms) was convinced it solved the problem but issue has returned yesterday.
- could ignitor be damaged by ECU or something ?
- cam sensor seems to be ok as fuel delivery works
- crank sensor seems to be fine swapped out known good one
- could be bad connection?
- previous test of coil seemed that had 12V source not test that yet since new issues
- all 3 coils failing simultaneously is not likely
- all wires and / or plugs failing at same time seems unlikely
- could be bad ECU that has the 3 channels all fail at same time intermittently?
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