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Car stalls and low RPMs

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Old Nov 19, 2010 | 11:15 AM
  #1  
camaro55555's Avatar
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Car stalls and low RPMs

I have a 1991 camaro with a 305 in it, 5 speed. The car stalls at low RPMs so I need to keep it high to keep it going. Im not sure what is causing it.
Thanks
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Old Nov 30, 2010 | 08:29 PM
  #2  
squibbles's Avatar
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Joined: Jul 2010
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From: north texas
Car: 1985 firebird
Engine: v6
Transmission: turbo auto
Axle/Gears: ?hellifiknow?
Re: Car stalls and low RPMs

Same with mine except its a 90 rs w/ 3.1l v6
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Old Nov 30, 2010 | 08:56 PM
  #3  
ASE doc's Avatar
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Joined: Apr 2010
Posts: 4,337
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From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: Car stalls and low RPMs

Check idle air control. Perhaps clean IAC passages.
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Old Nov 30, 2010 | 10:26 PM
  #4  
DeltaElite121's Avatar
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Joined: Feb 2006
Posts: 1,366
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From: St.Louis, IL
Car: 1988 Camaro
Engine: 377
Transmission: TH350; Circle D 4200 converter
Axle/Gears: Ford 9"
Re: Car stalls and low RPMs

Could be a dying fuel pump also. Mine used to stall if I let it come anywhere near 1000RPM's and it turned out my fuel pump was well on it's way out. It didn't like coming to a complete stop.

- by all means, check the easy stuff first though before coming to this conclusion. I agree with the above post.
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Old Dec 1, 2010 | 01:28 PM
  #5  
ASE doc's Avatar
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Joined: Apr 2010
Posts: 4,337
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From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: Car stalls and low RPMs

Fuel pressure could well be an issue. Unfortunately there isnt an easy way to check pressure. You can visually observe injector pattern while you snap the throttle. The spray pattern should touch the walls of each throttle bore. If the pattern seems a litlle wimpy to you, yoiu can perform a pressure test by disconnecting the fuel supply line(larger of the two lines) from the TB and, using adapters, installing a 0-15 PSI guage between the line and the TB. Pressure should run 9-13 PSI at idle and should jump closer to 13 on throttle snap. If pressure reads low, suspect a broken regulator spring, restricted fuel filter, or weak pump.
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Old Dec 1, 2010 | 02:04 PM
  #6  
little8camarors's Avatar
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Joined: Apr 2003
Posts: 67
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From: Pahrump, Nv
Car: 92 Camaro RS TTop,91 Camaro RS vert
Engine: 305 TBI V8
Transmission: 700R4
Re: Car stalls and low RPMs

Originally Posted by ASE doc
Check idle air control. Perhaps clean IAC passages.
Big time 2nd to this, both my 91 and 92 needed the IAC valve replaced.
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