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

Question about no start

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Old Jan 14, 2011 | 04:26 PM
  #1  
88TransAmGuy's Avatar
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From: Northwest Indiana, Kouts
Car: 88' White-Black Trans Am
Engine: Trying to find a motor
Transmission: 4L60E
Axle/Gears: 3.23
Question about no start

Alright so me and my dad rebuilt the FBI unit.we reinstalled it and got the car running. Reset the timing and it ran like brand new! Restarted the car 3 times with no problems.so the next day I go to start it and it just cranks and cranks.
Checked the car and it's got spark. But there's no fuel comming out Of the injectors. We checked both the return fuel line and the line in,they're not clogged.so my question is, could it be the pickup coil? Would that be cause the injectors to not drip the fuel? Anybody have any other ideas? Thanks
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Old Jan 14, 2011 | 04:41 PM
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88TransAmGuy's Avatar
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From: Northwest Indiana, Kouts
Car: 88' White-Black Trans Am
Engine: Trying to find a motor
Transmission: 4L60E
Axle/Gears: 3.23
Re: Question about no start

Haha sorry tbi
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Old Jan 15, 2011 | 09:31 PM
  #3  
88TransAmGuy's Avatar
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From: Northwest Indiana, Kouts
Car: 88' White-Black Trans Am
Engine: Trying to find a motor
Transmission: 4L60E
Axle/Gears: 3.23
Re: Question about no start

bump
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Old Jan 16, 2011 | 02:12 PM
  #4  
88TransAmGuy's Avatar
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From: Northwest Indiana, Kouts
Car: 88' White-Black Trans Am
Engine: Trying to find a motor
Transmission: 4L60E
Axle/Gears: 3.23
Re: Question about no start

bumppppppp
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Old Jan 16, 2011 | 09:26 PM
  #5  
emilde's Avatar
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From: muscoda wisconsin
Car: 1986 pontiac trans am
Engine: 305 t.p.i (for now)
Transmission: 700-r4
Re: Question about no start

does it have fuel pressure at the schrader valve on the fuel rail?
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Old Jan 16, 2011 | 09:37 PM
  #6  
88TransAmGuy's Avatar
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From: Northwest Indiana, Kouts
Car: 88' White-Black Trans Am
Engine: Trying to find a motor
Transmission: 4L60E
Axle/Gears: 3.23
Re: Question about no start

Oh sorry man it's a TBI so it doesnt have a schrader valve.when I crank it the injectors only drip.checked it with a noid light and cranked it and it flashed so it has a pulse. And the fuel pump is only 2 months old.not sure how to check pressure on a TBI unit?
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Old Jan 16, 2011 | 09:43 PM
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emilde's Avatar
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From: muscoda wisconsin
Car: 1986 pontiac trans am
Engine: 305 t.p.i (for now)
Transmission: 700-r4
Re: Question about no start

not sure what u have for tools but with fuel pressure guage i use, you can unhook the fuel line from the fiilter and tap into the line there. It can be a pain to check but sometimes its best to start with simple things...... let me know what ya find out
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Old Jan 18, 2011 | 08:51 PM
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From: Northwest Indiana, Kouts
Car: 88' White-Black Trans Am
Engine: Trying to find a motor
Transmission: 4L60E
Axle/Gears: 3.23
Re: Question about no start

Checked pressure at t.b. it was 0. Then checked for power at pump connection and I do have power so must be a bad pump or since its only a few months old might be installed wrong? Now my question is on the sending unit it says its a "fpg" harness. I'd like to change the sending unit because the fuel gauge doesnt work but no one seems to have a fpg unit for that car. They have other sending units listed but not fpg? So will a different unit work?
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Old Jan 19, 2011 | 05:34 PM
  #9  
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From: West-Central
Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: Question about no start

To test fuel pressure http://www.actron.com/product_detail.php?pid=16175

At key on engine off the fuel pump primes for around 2 seconds only.

Did you try here https://www.thirdgen.org/forums/member.php?u=95096 ?
If that does not work rockauto.com sells 3 brands of sendig units. https://www.thirdgen.org/forums/afte...unt-codes.html
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