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would love some help

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Old Jan 4, 2009 | 09:00 PM
  #1  
BigBadGTA's Avatar
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Joined: Nov 2008
Posts: 586
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From: Las Vegas, Nevada
Car: 1988 Trans Am GTA
Engine: 350TPI
Transmission: 700R4
Axle/Gears: 3:27
would love some help

Well my car runs a little ruff once it gets to warm idle speed. it starts and is A ok driving but when your just sitting, idling the car shakes a little too much. My dads 91 silverado with a 350 in it has 140k on it and is still smooth as silk, but my 350 gta has 78k and is ruff. any ideas?
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Old Jan 4, 2009 | 09:12 PM
  #2  
305sbc's Avatar
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From: Fairview Heights Illinois
Car: 1986 Irocz
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.25:1
Re: would love some help

I think most people check the IAC function first thing for rough idle.
You could also inspect the ignition - cap, wires, plugs for problems.
Check the ECM for error codes.
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Old Jan 4, 2009 | 09:50 PM
  #3  
BigBadGTA's Avatar
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Senior Member
15 Year Member
 
Joined: Nov 2008
Posts: 586
Likes: 1
From: Las Vegas, Nevada
Car: 1988 Trans Am GTA
Engine: 350TPI
Transmission: 700R4
Axle/Gears: 3:27
Re: would love some help

i changed the cap, rotor, wires, and plugs as soon as i got the car. you'll prob think I'm stupid for this but whats an IAC?
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Old Jan 5, 2009 | 02:27 AM
  #4  
84Z28406's Avatar
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Joined: Apr 2007
Posts: 365
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From: Winnipeg, MB, Canada
Car: 1984 Camaro Z28 T-tops
Engine: 350
Transmission: T-5
Axle/Gears: 3.23
Re: would love some help

I believe the IAC is Idle Air Control.
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Old Jan 5, 2009 | 08:03 AM
  #5  
jamon8's Avatar
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From: Southern IL
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: would love some help

have someone sit in the drivers set with it idling and the brake on

wiggle the maf sensor wires

if that does not change it take the plugs of the injectors one at a time

this should make the car run worse

if there is no change then you know that the injector or the ignition on that cly is to blame

if it starts to run a heck of alot better then the injector is bad and grounding out the whole circuit

tpi is a batch fire system
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Old Jan 5, 2009 | 04:07 PM
  #6  
BigBadGTA's Avatar
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Senior Member
15 Year Member
 
Joined: Nov 2008
Posts: 586
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From: Las Vegas, Nevada
Car: 1988 Trans Am GTA
Engine: 350TPI
Transmission: 700R4
Axle/Gears: 3:27
Re: would love some help

well I also put in a refurbished MAF, and had the injectors checked out, and they were all ok. The car has absolutely no problems running, and it doesn't sound like its struggling at all. could it be a bad motor mount or something along those lines? like I said, the car just vibrates a little too much, at least I think so.
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Old Jan 5, 2009 | 04:16 PM
  #7  
19redbird89's Avatar
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Joined: Jan 2006
Posts: 118
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From: Garland, texas
Car: 1989 Pontiac Trans Am GTA
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.23 9 bolt
Re: would love some help

Since you bring it up you could check your mounts but you would notice that any time you hit a bump. Make sure you so not have any air leaks and check all your plug in wires. That is a problem you just have to start with what you have already done and continue on down the list. Plugs, wires, coil, cap, rotor, timing, air leaks... The list goes on.

Brandon
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Old Jan 6, 2009 | 08:43 AM
  #8  
jamon8's Avatar
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From: Southern IL
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: would love some help

ok I put a brand new mafs on my car but the plug was a little loose and not making the best contact when my car was idleing and bouncing a bit.

look at the mounts as well

big pry bar to lift on the motor mounts

jack and a board the size of the trans pan and jack it up watching the trans mount

also check to see if the exsaust has clearence
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