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rough idle

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Old Jun 29, 2012 | 02:36 AM
  #1  
firebirdguy1991's Avatar
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Joined: May 2012
Posts: 6
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From: Detroit,MI
Car: 1991 Pontiac Firebird Formula
Engine: V-8 305
Transmission: Unknown
Axle/Gears: Unknown
rough idle

So a few months ago i got this car by a seller off the street.Thought it was a good deal but now im finding out it wasnt worth it. The car had been modified,the Catalyltic converter was taken out and replaced by a straight pipe.And a flowmaster exhaust was put in. Due to this my cars giving errors to the engine that im not getting oxygen. its running really rough and ocassionally stalls until i reach an engine temp of 150 degrees. Is there any kits or ways to solve this issue. Was told the engine guessing how much fuel its getting cause there is no sensors to tell it.
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Old Jun 29, 2012 | 07:15 AM
  #2  
IROCThe5.7L's Avatar
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Joined: Jul 2001
Posts: 5,225
Likes: 70
From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Re: rough idle

No cat and a flowmaster exhaust is not going to cause a rough idle. What exactly are the SES codes it's throwing?
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Old Jun 29, 2012 | 08:09 AM
  #3  
86T/A_Ram_Air's Avatar
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Joined: Mar 2009
Posts: 870
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From: Brick, NJ
Car: 91 Trans Am
Engine: 355 TPI
Transmission: Built T-5
Re: rough idle

yeah you have another problem. Take a paper clip and jump the two upper right pins on the data connector, the SES light will then flash you the codes through the dash. im sure there is a explicit write up somewhere
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Old Jun 30, 2012 | 09:12 AM
  #4  
rusty vango's Avatar
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Joined: Jun 2011
Posts: 2,036
Likes: 5
From: knoxville tn
Car: 86 IROC
Engine: 5.0 TPI
Transmission: 700-R-4
Axle/Gears: 2.73 open
Re: rough idle

Originally Posted by firebirdguy1991
So a few months ago i got this car by a seller off the street.Thought it was a good deal but now im finding out it wasnt worth it. The car had been modified,the Catalyltic converter was taken out and replaced by a straight pipe.And a flowmaster exhaust was put in. Due to this my cars giving errors to the engine that im not getting oxygen. its running really rough and ocassionally stalls until i reach an engine temp of 150 degrees. Is there any kits or ways to solve this issue. Was told the engine guessing how much fuel its getting cause there is no sensors to tell it.
welcome to the world of third gens ! where almost all of whats available is either hacked up by a series of drunken monkeys,or at best there is just everything missing. good hunting ,and hey ,at least it aint a civic,right?
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