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Rough idle when going threw carwash

Tiny
SIERP
  • MEMBER
  • 2004 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
When I go threw a automatic carwash, my blazer starts ideling rough no lights come on but if you give it some gas "like up to 2000 rpm" it smooths out, the idle drops down a few hundred rpms never dies just runs rough, after I get done with the wash an pull out, it still runs rough for a block or two then it straightens up, I just had the intake gaskets changed because it was leaking antifreeze out the front of it, but the intake gaskets where an are good around the intake ports to the heads, this has me wondering whats wrong?
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Friday, January 14th, 2011 AT 3:09 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Most likely an electrical connection is getting wet. GM calls them weather-pak or Metric-pak and they should be sealed.

I would check the connections underneath for broken secondary locking tabs.
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Friday, January 14th, 2011 AT 3:36 PM
Tiny
SIERP
  • MEMBER
  • 6 POSTS
Under the vehicle, or the hood, can u give me a more exact place to look, an how can I check it, an repair it?
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Friday, January 14th, 2011 AT 3:41 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Start under vehicle. Disconnect connector and check the silicon seal where wire comes in. These have a tab that locks the male and female sides, if tab is broke, then water can get in.
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Friday, January 14th, 2011 AT 3:58 PM

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