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

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Old Oct 19, 2007 | 10:07 PM
  #1  
Cash25's Avatar
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From: Keesler AFB, Ms
Car: 1986 Iroc Z-28
Engine: 5.0 305 TPI
Transmission: Auto
Axle/Gears: Stock
Please Help

Got a 91 RS, 305, TBI, Just replaced O2 sensor, Spark plugs, wires, cap, rotor, the nice tune up stuff. Removed the Smog pump, and capped the exhaust. Now it won't start, any help would be awesome. Thanks
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Old Oct 20, 2007 | 12:31 AM
  #2  
RFmaster's Avatar
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Joined: Jan 2007
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From: OC CA
Car: 75 Beast
Engine: 383 +EBL Flash
Transmission: 700R4
Axle/Gears: 4.11 with 33"
Re: Please Help

Cash25

1) Are you able to crank engine over?

2) Are you getting spark when engine is cranking? Take one spark plug wire bring it close to a engine ground or use spark plug tester.

3) Take of air cleaner assembly - have some one turn engine over. Do you see injectors firing fuel??

Post your findings and will take it from there..

//RF
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Old Oct 20, 2007 | 05:04 PM
  #3  
Cash25's Avatar
Thread Starter
Junior Member
 
Joined: Aug 2007
Posts: 16
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From: Keesler AFB, Ms
Car: 1986 Iroc Z-28
Engine: 5.0 305 TPI
Transmission: Auto
Axle/Gears: Stock
Re: Please Help

OK, the car has fire, has fuel, and turns over. I changed the TPS, and the fuel pressure reg. still no start. Ran the Codes all I got was 12 for about 6 to 7 times in a row. The sensors in the air chamber that was hook to the smog pump, would that cause it not to start? I'm lost. Help
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Old Oct 22, 2007 | 12:05 PM
  #4  
RFmaster's Avatar
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Joined: Jan 2007
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From: OC CA
Car: 75 Beast
Engine: 383 +EBL Flash
Transmission: 700R4
Axle/Gears: 4.11 with 33"
Re: Please Help

Cash25

1) Disconnecting AIR by pass valve does not effect engine start. Just make sure that wiring harness is stowed away.

2) If you are getting both spark and fuel the most likely problem is that your spark plug wires were incorrectly routed (mixed up). This happens very often. Crank engine over with a breaker bar to and align #1 cylinder to TDC - timing mark on balancer should point to 0 deg TDC and #1 piston should be at the top, #1 cylinder valves should be closed. Take dizzy hat off - mark rotor position on dizzy base with a felt tip marker. Once position of #1 cyl, on dizzy, has been verified check the rest of the spark plug wires.

//RF
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