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Engine quits while driving!!

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Old Jul 12, 2009 | 11:03 AM
  #1  
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Default Engine quits while driving!!

Got a buddy's '99 auto with 68K miles. No mods, all stock. Symptoms are a slightly rough idle, but the car will shut off driving along at about 40 kinda like the key gets turned off, but comes back. This ONLY happens w/AC ON!!!! Runs OK otherwise.

Other history:
Car was in major front end wreck, fixed 2 yrs ago at dealer
No Codes or Warnings, except ABS lite and trac lite ON
Has >120 oil press (sending unit problem); DIC not working

Any help appreciated
Mike
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Old Jul 12, 2009 | 11:07 AM
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Could be several things, but my first thing to check would be the BCM at the pass foot well just left of the fuse block to see if it is getting wet from A/C condensation dripping on it. There is an A/C drain that gets plugged up allowing water to drip on the computer there under the foot well cover.
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Old Jul 12, 2009 | 01:03 PM
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Read the thread on ignition switch repair, also read the ground thread. Dave
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Old Jul 12, 2009 | 05:56 PM
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There's got to be codes if those lights on are. Pull your codes again.
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Old Jul 12, 2009 | 07:29 PM
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Thanks for the replies!!! My el cheapo scanner does not read ABS codes, but I don't think that would cause it to stall while driving. Will use the big Snap On scanner tomorrow.

It is worse with the AC on, and with AC off idles better and no stalling. Engine has good power otherwise.

DIC buttons don't work either.....
Rgds, Mike
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Old Jul 12, 2009 | 08:50 PM
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You need a tech2 to pull the codes since the DIC is not working. Sounds like some kind of electrical snafu.
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Old Jul 13, 2009 | 09:46 AM
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Check fuel pressure, may have clogged fuel filter? My car had a broke wire and never set a code, but on the dyno it was jumping all over the place so i figured dirty maf, but i started to look and there was a broken wire on the drivers side shooting to the ex mani..
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Old Jul 13, 2009 | 10:17 AM
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After you check fuel, check fire. Also, weak/poorly connected battery can cause havoc.
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Old Jul 14, 2009 | 02:08 PM
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Found problem was caused by loose batt wires at the fuse box. Also had corroded neg bat terminal, causing low voltage!!
Thanks again guys
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Old Jul 14, 2009 | 03:13 PM
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Originally Posted by mikem350
Found problem ............was caused by loose batt wires at the fuse box. Also had corroded neg bat terminal, causing low voltage!!
Thanks again guys
That was too easy. (At least it seems so AFTER the fix) Glad you found the solution.
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