2002 Pontiac Bonneville Loses power when driving

2002 PONTIAC BONNEVILLE
146,000 MILES • 6 CYL • FWD • AUTOMATIC
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SAUCEY202
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  • 2 POSTS
When I am driving down the road my car will just turn off. The electrical stay on, but the engine turns off. Once it sits for about 30 seconds it will start again and run normally. This will happen at both high and low speeds. Sometimes you can feel it trying to surge when it is about to turn off, even if I step on te accelerator it will still turn off.
Oct 28, 2010 at 4:23 PM
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FACTORYJACK
  • ✓ASE Certified Mechanic
  • 4,159 POSTS
  • ASE Certified Mechanic
My guess is you are losing spark, or ignition voltage. Do you get any check engine light during this, or has it been checked for any stored codes that would give an indication?
Oct 28, 2010 at 11:05 PM
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SAUCEY202
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Yes I had it checked and it did not show any codes
Oct 29, 2010 at 6:17 AM
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FACTORYJACK
  • ✓ASE Certified Mechanic
  • 4,159 POSTS
  • ASE Certified Mechanic
That would suggest that it is probably a loss of ignition voltage, at the same time the PCM could be losing the voltage for running, it is also losing it's capability to set a code. It may be similar to key being shut off, and can possibly be the ignition switch that is causing it. You could possibly backprobe and check for losses of voltage, this could be a process of elimination, and time consuming depending upon how often it occurs. Otherwise, duplicating it with a scan tool that can read data installed, is another choice.
Oct 30, 2010 at 6:08 PM
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