VEMS no spark while cranking with low voltage

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chaloux
Posts: 3167
Joined: Wed Feb 27, 2013 11:43 am
Location: Muskoka, Ontario, Canada

VEMS no spark while cranking with low voltage

Post by chaloux »

So Ross, the current owner of 4FOXSN8X, is having an issue where when he or the mechanic goes to start the car it won't start. He has some small parasitic draw that is lowering battery voltage past 12v and then he's getting no spark. Does VEMS stop sending spark after a certain voltage point? Can that be disabled?

Thanks dudes. I can't find anything online, or at least on my phone, that talks about this but I vaguely remember it being a thing.

Yes... I know a charger for ten minutes or a battery tender would "fix" the low voltage until the draw was found.
Matt

18 Silverado 1500 work pig, roof rack and tonneau cover
11 Jetta sedan TDI DSG, rear muffler delete
GONE :( 87 4ktq - 4 FOX SNAKES

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ringbearer
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Joined: Wed Feb 27, 2013 12:50 pm
Location: Nor-Cal

Re: VEMS no spark while cranking with low voltage

Post by ringbearer »

I don't know but you are a great car seller, still helping years later :)
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chaloux
Posts: 3167
Joined: Wed Feb 27, 2013 11:43 am
Location: Muskoka, Ontario, Canada

Re: VEMS no spark while cranking with low voltage

Post by chaloux »

The answer is that NO this doesn't exist. Thumbs up.
Matt

18 Silverado 1500 work pig, roof rack and tonneau cover
11 Jetta sedan TDI DSG, rear muffler delete
GONE :( 87 4ktq - 4 FOX SNAKES

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carl
Posts: 154
Joined: Thu Mar 07, 2013 11:05 am

Re: VEMS no spark while cranking with low voltage

Post by carl »

Won't spark or losing trigger signal?
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88a5tq
Posts: 1553
Joined: Wed Jul 16, 2014 10:27 pm

Re: VEMS no spark while cranking with low voltage

Post by 88a5tq »

Any chance you related the starter signal wire? I had this happen and it was the signal wire I ran that rubbed through on the axle and shorting out!
1991 Audi 200q Holset
1991 Audi 200q Felbaum'd
1988 Audi 5000 TQ
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