TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

rpms jump up and down

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Old Sep 21, 2012 | 03:24 PM
  #1  
littlevin91's Avatar
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Car: 1991 camaro z28 convertible
Engine: 5.0 v8
Transmission: 700r4
Axle/Gears: 9 bolt 3.23 borg worner
rpms jump up and down

I changed the manifold on my motor. When i put everything back together i started the car set the timing and the rpms will go up and down i get no throttle responce at all. Ive changed the fuel filter, cap and rotor, the iac in the tb and nothing has worked

Last edited by littlevin91; Sep 21, 2012 at 03:42 PM.
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Old Sep 21, 2012 | 04:52 PM
  #2  
onebad92's Avatar
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Re: rpms jump up and down

what do you mean by no throttle response at all?? like it wont rev up in neutral?
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Old Sep 21, 2012 | 07:48 PM
  #3  
littlevin91's Avatar
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Car: 1991 camaro z28 convertible
Engine: 5.0 v8
Transmission: 700r4
Axle/Gears: 9 bolt 3.23 borg worner
Re: rpms jump up and down

Itll rev in neutral and park no problem but it i put.it in drive or anyother gear n give it gas the rpms drop and.it dies
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Old Sep 22, 2012 | 12:59 AM
  #4  
InfernalVortex's Avatar
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From: Macon, GA
Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
Transmission: T56
Axle/Gears: 9-bolt 3.70
Re: rpms jump up and down

Make sure all your vacuum lines are connected and make sure the timing is correct. DISCONNECT THE ESC PLUG TO SET TIMING TO ZERO! Then turn off and reconnect ESC and see if it helps.
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Old Sep 22, 2012 | 10:16 PM
  #5  
littlevin91's Avatar
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Car: 1991 camaro z28 convertible
Engine: 5.0 v8
Transmission: 700r4
Axle/Gears: 9 bolt 3.23 borg worner
Re: rpms jump up and down

all the lines are connected and when i did the timing i unplugged the est and the timings on
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Old Sep 23, 2012 | 09:31 AM
  #6  
pound's Avatar
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From: Beautiful Coastal New Jersey
Car: 1990 Firebird
Engine: 350 TBI
Transmission: T5
Axle/Gears: Auburn posi 3.73
Re: rpms jump up and down

What manifold did you put on? If its not a stock one, or close to it, you may need to do some prom tuning.
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Old Sep 23, 2012 | 07:15 PM
  #7  
littlevin91's Avatar
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Car: 1991 camaro z28 convertible
Engine: 5.0 v8
Transmission: 700r4
Axle/Gears: 9 bolt 3.23 borg worner
Re: rpms jump up and down

its a stock tbi manifold my dad picked up from a junk yard
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