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PostPosted: Thu Jul 05, 2018 12:38 pm 
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Joined: Sat Jun 30, 2018 2:50 am
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Year and Trim: 1994 Bonneville SSEi
Hey,

So I bought this 94 for a steal; its only got 89,000 KMs on it; needed a starter and breaks so I did those, check and there was already a VATS bypass in place, but I still get a no crank no start intermittently. Like this morning. The weird thing is the security light will flicker sometimes when driving, not on when starting.


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PostPosted: Thu Jul 05, 2018 1:55 pm 
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Joined: Sat Jun 30, 2018 2:50 am
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Year and Trim: 1994 Bonneville SSEi
Other thing is if I cycle the key back to aux it will start 90% of the time...


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PostPosted: Thu Jul 05, 2018 1:58 pm 
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Joined: Tue May 27, 2008 8:53 am
Posts: 5327
Location: Las Cruces, NM
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
The TDM may have completely failed.

I would also check the ground bus bars just to make sure they are okay.

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~Randall~
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1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place


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PostPosted: Thu Jul 05, 2018 3:16 pm 
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Year and Trim: 2003 Lesabre Limited, 2008 Cobalt, 2014 Malibu
I would check the connections of the VATS resistance replacement that was put in. IF the connections weren't soldered, but were just pressed together, there may be a changing resistance with temperature for example.

IF the resistance is a set of resistors coupled together, I'd check that resistance with my own meter and compare it to the expected resistances for whichever of the 14 factory choices was used. IIRC, the expected resistance to pass the test on starting approval by the TDM is within 5% or maybe 10% of that exact resistance. Someone may have done their own and it's marginal in it's resistance. Add that to slight variation with unsoldered connections and you've got the occasional TDM light on.


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PostPosted: Thu Jul 05, 2018 8:12 pm 
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Certified Bonneville Nut
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Joined: Tue May 27, 2008 8:53 am
Posts: 5327
Location: Las Cruces, NM
Year and Trim: 1993 Buick Park Avenue
1994 Buick Regal Custom
Also, pay attention to what the security light is doing. If it stays on steady at key on, and doesn't go out in a few seconds, it may be a VATS intervention. Same thing if the security light is blinking.

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~Randall~
ImageImage

1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place


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