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

rebuild tbi now injectors won't spray (pulse)

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Old Apr 30, 2013 | 11:46 PM
  #1  
twistedfaith17's Avatar
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Joined: Apr 2007
Posts: 19
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From: Louisville
Car: 92 rs
Engine: 350 tbi
Transmission: 700-r4 with shift kit
rebuild tbi now injectors won't spray (pulse)

i just took apart my throttle body, and replaced it with a ported unit. i changed everything including the base, the injector pod, fuel fittings, and reused only my iac, tps, both less than a year old, and my injectors which were spraying fine till now. i also added an inline fuel pressure gauge. i get 15 pounds of pressure, test light shows constant power to injectors. i'm lost the car started fine yesterday. what really could have went wrong in this simple swap.

also after excess cranking of the car fuel will start to seep out the regulator, which also has a new diaphragm.

my plans tomorrow are to try an ignition control module (doubtful it went at the same time i did this) and a complete disassembly to look for blockages.
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Old May 1, 2013 | 09:27 AM
  #2  
RFmaster's Avatar
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Joined: Jan 2007
Posts: 1,873
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From: OC CA
Car: 75 Beast
Engine: 383 +EBL Flash
Transmission: 700R4
Axle/Gears: 4.11 with 33"
Re: rebuild tbi now injectors won't spray (pulse)

Make sure that your ignition coil Main DC plug (With pink wire) is fully plugged into the coil and the two wire harness between dizzy and coil is plugged as well. No power to ICM will cause no DRP to ECM which will never fire injectors.

Re-check the 4 bolts that secure FPR cover to TB flange - it is uncommon, but occasionally they will leak.

//RF
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Old May 1, 2013 | 10:39 AM
  #3  
twistedfaith17's Avatar
Thread Starter
Junior Member
 
Joined: Apr 2007
Posts: 19
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From: Louisville
Car: 92 rs
Engine: 350 tbi
Transmission: 700-r4 with shift kit
Re: rebuild tbi now injectors won't spray (pulse)

I believe i may have found the problem. i found a blockage in the pod, it was a remaned piece but i guess laying around it collected some dirt and grime on the inlet side. it was almost 100% blocked. bout to put it all back together now. i did check connections and they appear to be good. if this does not work i will check voltage at the icm
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Old May 1, 2013 | 11:10 AM
  #4  
twistedfaith17's Avatar
Thread Starter
Junior Member
 
Joined: Apr 2007
Posts: 19
Likes: 0
From: Louisville
Car: 92 rs
Engine: 350 tbi
Transmission: 700-r4 with shift kit
Re: rebuild tbi now injectors won't spray (pulse)

problem solved. it was the blockage
thanks for the advice anyway
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