V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

91 V6 rough idle when hot

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Old Sep 19, 2009 | 09:38 PM
  #51  
CharcoalBird's Avatar
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From: Plant City, FL
Car: 1991 Firebird
Engine: 3.1L V6
Re: 91 V6 rough idle when hot

Joe, where are you from?
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Old Sep 20, 2009 | 02:24 PM
  #52  
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From: Florida
Car: 91 Vert, 69 SS, 91 Coupe
Engine: V8, V8, V6
Transmission: Auto, Auto, 5 speed
Re: 91 V6 rough idle when hot

Near Orlando
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Old Sep 27, 2011 | 10:39 PM
  #53  
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From: Hillsboro, Missouri
Car: 1989 Chevy Camaro IROC-Z
Engine: 350 TPI
Transmission: 700R-4
Axle/Gears: Borg-Warner rear axle 2.77
Re: 91 V6 rough idle when hot

u ever fig this out?
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Old Aug 30, 2012 | 10:56 AM
  #54  
lennycuzzi's Avatar
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Re: 91 V6 rough idle when hot

Hey joe I have the same exact problem did you ever fix it?
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Old Aug 30, 2012 | 11:05 AM
  #55  
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Re: 91 V6 rough idle when hot

I have the same problem was this car ever fixed?
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Old Sep 13, 2012 | 03:18 PM
  #56  
Dizturbed One's Avatar
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Joined: Mar 2005
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From: Sacramento, California
Car: 92 RS
Engine: a slow one
Transmission: a crunchy one
Axle/Gears: a whiny one
Re: 91 V6 rough idle when hot

Sorry, couldn't read the whole thread, not enough time.

But at work, if I got one of these running rough after it warms up, I would check the Ignition Control Module and the Pickup Coil, Ignition Coil, check EGR valve operation, clogs in the EGR tube, fuel pressure regulator, and oxygen sensor/wiring. I think you've maybe gone a bit far already and need to get back to some of the basics you may have overlooked. Has happened to me on more than one occasion while at home with limited resources (I live in an apartment).

FUNTION TEST THEM, don't just replace them. I've had bad ICM's, bad coils (pickup AND ignition), and bad EGR's, brand new out of the box, more times than I can count at work, and also once each at home (except the EGR). Each one of those instances had me pulling my hair out assuming the part couldn't be the problem because "it was new".

I no longer buy parts to test function unless it is necessary, now I just wait a day and bring the tools home to check it out properly. LOL
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Old Sep 13, 2012 | 05:10 PM
  #57  
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Re: 91 V6 rough idle when hot

I have a 91 RS with a 3.1L V6. Fires up and idles fine but I get a strong fuel smell and it stalls when accelerating any ideas?
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