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

sputters and shuts off

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Old Nov 5, 2005 | 01:35 PM
  #1  
Driveshaft's Avatar
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From: N.E. Philly Pa
Car: 89 formula
Engine: 305 tbi
Transmission: 700R4
sputters and shuts off

89 firebird 305 tbi

at a certain throttle position the car sputters and shuts off. it feels like the injectors are not getting electricity
I have replaced the tps twice in 5 months, I am almost positive this is not the problem
if I bury the throttle or let off the problem goes away- ----

any other places to look or suggestions on what to do
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Old Nov 5, 2005 | 01:51 PM
  #2  
robertfrank's Avatar
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From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
have you changed your fuel filter?
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Old Nov 5, 2005 | 02:09 PM
  #3  
Driveshaft's Avatar
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From: N.E. Philly Pa
Car: 89 formula
Engine: 305 tbi
Transmission: 700R4
Originally posted by robertfrank
have you changed your fuel filter?
will do that sunday, but pretty sure its electrical
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Old Nov 5, 2005 | 11:22 PM
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From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Hmmm... Can you elaborate on the problem? Is it just one throttle position, or does it happen randomly when the throttle is open? Does it set the check engine light?
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Old Nov 7, 2005 | 02:01 PM
  #5  
igotoxs's Avatar
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From: Beaverton, OR
Car: 1986 C4 Corvette
Engine: 350 TPI L98
Transmission: Doug Nash 4+3
Axle/Gears: 3.07
I have to agree that it is likely the fuel filter.
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Old Nov 7, 2005 | 02:52 PM
  #6  
Driveshaft's Avatar
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From: N.E. Philly Pa
Car: 89 formula
Engine: 305 tbi
Transmission: 700R4
Originally posted by dimented24x7
Hmmm... Can you elaborate on the problem? Is it just one throttle position, or does it happen randomly when the throttle is open? Does it set the check engine light?
just one throttle position - around 1200 - 1500 rpm - through all gears
if I move it above or below it woks fine
there is no problem when its in park or neutral, only when in gear

one more thought - it doesn't do it all the time -
its been about 3 weeks since last time and before that it was 6 weeks
its been intermittent the 3 years I've owned the car
that's why I'm learning towards an electrical problem and not fuel.
But I will get the filter changed this week anyway
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