how to diagnose a rough idle and acceleration
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Junior Member
Joined: Jan 2014
Posts: 9
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From: bay area, california
Car: 1990 iroc z
Engine: 5.7L 350
Transmission: 700r4
how to diagnose a rough idle and acceleration
i just recently bought a 1990 iroc z 5.7L it has a rough idle and feels close to stalling, and when i accelerate it is sluggish and jumpy. want to know how to diagnose this issue to fix it. car also is heating up, figure it could be an issue with the radiator fans, would be nice if that could be explained as well, sorry if this post is in the wrong area. kinda new to cars, just want to know how to fix mine, all help is much appreciated. thank you ahead of time
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iTrader: (2)
Joined: Mar 2003
Posts: 859
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From: Birmingham Alabama
Car: 1991 Firebird convertible
Engine: LQ4 ls 6.0
Transmission: 4L60E
Axle/Gears: 342 Limited slip
Re: how to diagnose a rough idle and acceleration
I cant say im a body guy but you may get better feedback if you post this in the engine forum
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Joined: Jan 2014
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Re: how to diagnose a rough idle and acceleration
I found the prob! it was the front O2 sensor put a new one in and it ran perfectly. the sensors pricy tho :/ $230 but that's the issue man
Last edited by kennyjames; Jan 26, 2014 at 10:35 AM.
Thread Starter
Junior Member
Joined: Jan 2014
Posts: 9
Likes: 0
From: bay area, california
Car: 1990 iroc z
Engine: 5.7L 350
Transmission: 700r4
Re: how to diagnose a rough idle and acceleration
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Joined: May 2005
Posts: 2,220
Likes: 68
From: Atlanta
Car: '02 T/A WS6, '91 T/A, '91 Camaro RS
Engine: LS1, LB9, L03
Transmission: T56, 700R4, 700R4
Axle/Gears: 4.10 10 bolt, 2.73 10 bolts
Re: how to diagnose a rough idle and acceleration
I paid $20 for a Bosch one back in '05...dunno about Delco, but $230 for one OBD1 o2 sensor sounds insanely high to me.
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From: North Carolina
Car: Pontiac 89 GTA
Engine: 350 TPI 5.7L V8
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